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![Alan Stern](/assets/img/avatar_default.png)
The kernel's implementation of notifier chains is unsafe. There is no protection against entries being added to or removed from a chain while the chain is in use. The issues were discussed in this thread: http://marc.theaimsgroup.com/?l=linux-kernel&m=113018709002036&w=2 We noticed that notifier chains in the kernel fall into two basic usage classes: "Blocking" chains are always called from a process context and the callout routines are allowed to sleep; "Atomic" chains can be called from an atomic context and the callout routines are not allowed to sleep. We decided to codify this distinction and make it part of the API. Therefore this set of patches introduces three new, parallel APIs: one for blocking notifiers, one for atomic notifiers, and one for "raw" notifiers (which is really just the old API under a new name). New kinds of data structures are used for the heads of the chains, and new routines are defined for registration, unregistration, and calling a chain. The three APIs are explained in include/linux/notifier.h and their implementation is in kernel/sys.c. With atomic and blocking chains, the implementation guarantees that the chain links will not be corrupted and that chain callers will not get messed up by entries being added or removed. For raw chains the implementation provides no guarantees at all; users of this API must provide their own protections. (The idea was that situations may come up where the assumptions of the atomic and blocking APIs are not appropriate, so it should be possible for users to handle these things in their own way.) There are some limitations, which should not be too hard to live with. For atomic/blocking chains, registration and unregistration must always be done in a process context since the chain is protected by a mutex/rwsem. Also, a callout routine for a non-raw chain must not try to register or unregister entries on its own chain. (This did happen in a couple of places and the code had to be changed to avoid it.) Since atomic chains may be called from within an NMI handler, they cannot use spinlocks for synchronization. Instead we use RCU. The overhead falls almost entirely in the unregister routine, which is okay since unregistration is much less frequent that calling a chain. Here is the list of chains that we adjusted and their classifications. None of them use the raw API, so for the moment it is only a placeholder. ATOMIC CHAINS ------------- arch/i386/kernel/traps.c: i386die_chain arch/ia64/kernel/traps.c: ia64die_chain arch/powerpc/kernel/traps.c: powerpc_die_chain arch/sparc64/kernel/traps.c: sparc64die_chain arch/x86_64/kernel/traps.c: die_chain drivers/char/ipmi/ipmi_si_intf.c: xaction_notifier_list kernel/panic.c: panic_notifier_list kernel/profile.c: task_free_notifier net/bluetooth/hci_core.c: hci_notifier net/ipv4/netfilter/ip_conntrack_core.c: ip_conntrack_chain net/ipv4/netfilter/ip_conntrack_core.c: ip_conntrack_expect_chain net/ipv6/addrconf.c: inet6addr_chain net/netfilter/nf_conntrack_core.c: nf_conntrack_chain net/netfilter/nf_conntrack_core.c: nf_conntrack_expect_chain net/netlink/af_netlink.c: netlink_chain BLOCKING CHAINS --------------- arch/powerpc/platforms/pseries/reconfig.c: pSeries_reconfig_chain arch/s390/kernel/process.c: idle_chain arch/x86_64/kernel/process.c idle_notifier drivers/base/memory.c: memory_chain drivers/cpufreq/cpufreq.c cpufreq_policy_notifier_list drivers/cpufreq/cpufreq.c cpufreq_transition_notifier_list drivers/macintosh/adb.c: adb_client_list drivers/macintosh/via-pmu.c sleep_notifier_list drivers/macintosh/via-pmu68k.c sleep_notifier_list drivers/macintosh/windfarm_core.c wf_client_list drivers/usb/core/notify.c usb_notifier_list drivers/video/fbmem.c fb_notifier_list kernel/cpu.c cpu_chain kernel/module.c module_notify_list kernel/profile.c munmap_notifier kernel/profile.c task_exit_notifier kernel/sys.c reboot_notifier_list net/core/dev.c netdev_chain net/decnet/dn_dev.c: dnaddr_chain net/ipv4/devinet.c: inetaddr_chain It's possible that some of these classifications are wrong. If they are, please let us know or submit a patch to fix them. Note that any chain that gets called very frequently should be atomic, because the rwsem read-locking used for blocking chains is very likely to incur cache misses on SMP systems. (However, if the chain's callout routines may sleep then the chain cannot be atomic.) The patch set was written by Alan Stern and Chandra Seetharaman, incorporating material written by Keith Owens and suggestions from Paul McKenney and Andrew Morton. [jes@sgi.com: restructure the notifier chain initialization macros] Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com> Signed-off-by: Jes Sorensen <jes@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
656 lines
16 KiB
C
656 lines
16 KiB
C
/*
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* dcdbas.c: Dell Systems Management Base Driver
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*
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* The Dell Systems Management Base Driver provides a sysfs interface for
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* systems management software to perform System Management Interrupts (SMIs)
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* and Host Control Actions (power cycle or power off after OS shutdown) on
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* Dell systems.
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*
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* See Documentation/dcdbas.txt for more information.
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*
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* Copyright (C) 1995-2005 Dell Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License v2.0 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/platform_device.h>
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#include <linux/dma-mapping.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/mc146818rtc.h>
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#include <linux/module.h>
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#include <linux/reboot.h>
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#include <linux/sched.h>
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#include <linux/smp.h>
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#include <linux/spinlock.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/mutex.h>
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#include <asm/io.h>
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#include <asm/semaphore.h>
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#include "dcdbas.h"
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#define DRIVER_NAME "dcdbas"
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#define DRIVER_VERSION "5.6.0-2"
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#define DRIVER_DESCRIPTION "Dell Systems Management Base Driver"
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static struct platform_device *dcdbas_pdev;
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static u8 *smi_data_buf;
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static dma_addr_t smi_data_buf_handle;
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static unsigned long smi_data_buf_size;
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static u32 smi_data_buf_phys_addr;
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static DEFINE_MUTEX(smi_data_lock);
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static unsigned int host_control_action;
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static unsigned int host_control_smi_type;
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static unsigned int host_control_on_shutdown;
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/**
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* smi_data_buf_free: free SMI data buffer
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*/
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static void smi_data_buf_free(void)
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{
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if (!smi_data_buf)
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return;
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dev_dbg(&dcdbas_pdev->dev, "%s: phys: %x size: %lu\n",
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__FUNCTION__, smi_data_buf_phys_addr, smi_data_buf_size);
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dma_free_coherent(&dcdbas_pdev->dev, smi_data_buf_size, smi_data_buf,
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smi_data_buf_handle);
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smi_data_buf = NULL;
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smi_data_buf_handle = 0;
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smi_data_buf_phys_addr = 0;
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smi_data_buf_size = 0;
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}
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/**
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* smi_data_buf_realloc: grow SMI data buffer if needed
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*/
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static int smi_data_buf_realloc(unsigned long size)
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{
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void *buf;
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dma_addr_t handle;
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if (smi_data_buf_size >= size)
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return 0;
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if (size > MAX_SMI_DATA_BUF_SIZE)
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return -EINVAL;
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/* new buffer is needed */
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buf = dma_alloc_coherent(&dcdbas_pdev->dev, size, &handle, GFP_KERNEL);
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if (!buf) {
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dev_dbg(&dcdbas_pdev->dev,
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"%s: failed to allocate memory size %lu\n",
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__FUNCTION__, size);
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return -ENOMEM;
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}
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/* memory zeroed by dma_alloc_coherent */
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if (smi_data_buf)
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memcpy(buf, smi_data_buf, smi_data_buf_size);
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/* free any existing buffer */
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smi_data_buf_free();
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/* set up new buffer for use */
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smi_data_buf = buf;
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smi_data_buf_handle = handle;
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smi_data_buf_phys_addr = (u32) virt_to_phys(buf);
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smi_data_buf_size = size;
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dev_dbg(&dcdbas_pdev->dev, "%s: phys: %x size: %lu\n",
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__FUNCTION__, smi_data_buf_phys_addr, smi_data_buf_size);
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return 0;
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}
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static ssize_t smi_data_buf_phys_addr_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "%x\n", smi_data_buf_phys_addr);
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}
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static ssize_t smi_data_buf_size_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "%lu\n", smi_data_buf_size);
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}
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static ssize_t smi_data_buf_size_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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unsigned long buf_size;
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ssize_t ret;
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buf_size = simple_strtoul(buf, NULL, 10);
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/* make sure SMI data buffer is at least buf_size */
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mutex_lock(&smi_data_lock);
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ret = smi_data_buf_realloc(buf_size);
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mutex_unlock(&smi_data_lock);
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if (ret)
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return ret;
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return count;
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}
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static ssize_t smi_data_read(struct kobject *kobj, char *buf, loff_t pos,
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size_t count)
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{
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size_t max_read;
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ssize_t ret;
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mutex_lock(&smi_data_lock);
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if (pos >= smi_data_buf_size) {
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ret = 0;
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goto out;
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}
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max_read = smi_data_buf_size - pos;
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ret = min(max_read, count);
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memcpy(buf, smi_data_buf + pos, ret);
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out:
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mutex_unlock(&smi_data_lock);
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return ret;
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}
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static ssize_t smi_data_write(struct kobject *kobj, char *buf, loff_t pos,
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size_t count)
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{
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ssize_t ret;
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mutex_lock(&smi_data_lock);
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ret = smi_data_buf_realloc(pos + count);
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if (ret)
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goto out;
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memcpy(smi_data_buf + pos, buf, count);
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ret = count;
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out:
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mutex_unlock(&smi_data_lock);
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return ret;
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}
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static ssize_t host_control_action_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "%u\n", host_control_action);
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}
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static ssize_t host_control_action_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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ssize_t ret;
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/* make sure buffer is available for host control command */
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mutex_lock(&smi_data_lock);
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ret = smi_data_buf_realloc(sizeof(struct apm_cmd));
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mutex_unlock(&smi_data_lock);
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if (ret)
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return ret;
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host_control_action = simple_strtoul(buf, NULL, 10);
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return count;
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}
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static ssize_t host_control_smi_type_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "%u\n", host_control_smi_type);
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}
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static ssize_t host_control_smi_type_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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host_control_smi_type = simple_strtoul(buf, NULL, 10);
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return count;
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}
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static ssize_t host_control_on_shutdown_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "%u\n", host_control_on_shutdown);
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}
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static ssize_t host_control_on_shutdown_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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host_control_on_shutdown = simple_strtoul(buf, NULL, 10);
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return count;
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}
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/**
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* smi_request: generate SMI request
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*
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* Called with smi_data_lock.
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*/
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static int smi_request(struct smi_cmd *smi_cmd)
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{
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cpumask_t old_mask;
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int ret = 0;
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if (smi_cmd->magic != SMI_CMD_MAGIC) {
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dev_info(&dcdbas_pdev->dev, "%s: invalid magic value\n",
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__FUNCTION__);
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return -EBADR;
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}
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/* SMI requires CPU 0 */
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old_mask = current->cpus_allowed;
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set_cpus_allowed(current, cpumask_of_cpu(0));
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if (smp_processor_id() != 0) {
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dev_dbg(&dcdbas_pdev->dev, "%s: failed to get CPU 0\n",
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__FUNCTION__);
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ret = -EBUSY;
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goto out;
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}
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/* generate SMI */
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asm volatile (
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"outb %b0,%w1"
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: /* no output args */
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: "a" (smi_cmd->command_code),
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"d" (smi_cmd->command_address),
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"b" (smi_cmd->ebx),
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"c" (smi_cmd->ecx)
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: "memory"
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);
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out:
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set_cpus_allowed(current, old_mask);
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return ret;
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}
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/**
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* smi_request_store:
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*
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* The valid values are:
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* 0: zero SMI data buffer
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* 1: generate calling interface SMI
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* 2: generate raw SMI
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*
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* User application writes smi_cmd to smi_data before telling driver
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* to generate SMI.
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*/
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static ssize_t smi_request_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct smi_cmd *smi_cmd;
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unsigned long val = simple_strtoul(buf, NULL, 10);
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ssize_t ret;
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mutex_lock(&smi_data_lock);
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if (smi_data_buf_size < sizeof(struct smi_cmd)) {
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ret = -ENODEV;
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goto out;
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}
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smi_cmd = (struct smi_cmd *)smi_data_buf;
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switch (val) {
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case 2:
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/* Raw SMI */
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ret = smi_request(smi_cmd);
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if (!ret)
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ret = count;
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break;
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case 1:
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/* Calling Interface SMI */
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smi_cmd->ebx = (u32) virt_to_phys(smi_cmd->command_buffer);
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ret = smi_request(smi_cmd);
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if (!ret)
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ret = count;
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break;
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case 0:
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memset(smi_data_buf, 0, smi_data_buf_size);
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ret = count;
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break;
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default:
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ret = -EINVAL;
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break;
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}
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out:
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mutex_unlock(&smi_data_lock);
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return ret;
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}
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/**
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* host_control_smi: generate host control SMI
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*
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* Caller must set up the host control command in smi_data_buf.
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*/
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static int host_control_smi(void)
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{
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struct apm_cmd *apm_cmd;
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u8 *data;
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unsigned long flags;
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u32 num_ticks;
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s8 cmd_status;
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u8 index;
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apm_cmd = (struct apm_cmd *)smi_data_buf;
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apm_cmd->status = ESM_STATUS_CMD_UNSUCCESSFUL;
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switch (host_control_smi_type) {
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case HC_SMITYPE_TYPE1:
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spin_lock_irqsave(&rtc_lock, flags);
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/* write SMI data buffer physical address */
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data = (u8 *)&smi_data_buf_phys_addr;
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for (index = PE1300_CMOS_CMD_STRUCT_PTR;
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index < (PE1300_CMOS_CMD_STRUCT_PTR + 4);
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index++, data++) {
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outb(index,
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(CMOS_BASE_PORT + CMOS_PAGE2_INDEX_PORT_PIIX4));
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outb(*data,
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(CMOS_BASE_PORT + CMOS_PAGE2_DATA_PORT_PIIX4));
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}
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/* first set status to -1 as called by spec */
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cmd_status = ESM_STATUS_CMD_UNSUCCESSFUL;
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outb((u8) cmd_status, PCAT_APM_STATUS_PORT);
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/* generate SMM call */
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outb(ESM_APM_CMD, PCAT_APM_CONTROL_PORT);
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spin_unlock_irqrestore(&rtc_lock, flags);
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/* wait a few to see if it executed */
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num_ticks = TIMEOUT_USEC_SHORT_SEMA_BLOCKING;
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while ((cmd_status = inb(PCAT_APM_STATUS_PORT))
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== ESM_STATUS_CMD_UNSUCCESSFUL) {
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num_ticks--;
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if (num_ticks == EXPIRED_TIMER)
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return -ETIME;
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}
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break;
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case HC_SMITYPE_TYPE2:
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case HC_SMITYPE_TYPE3:
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spin_lock_irqsave(&rtc_lock, flags);
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/* write SMI data buffer physical address */
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data = (u8 *)&smi_data_buf_phys_addr;
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for (index = PE1400_CMOS_CMD_STRUCT_PTR;
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index < (PE1400_CMOS_CMD_STRUCT_PTR + 4);
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index++, data++) {
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outb(index, (CMOS_BASE_PORT + CMOS_PAGE1_INDEX_PORT));
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outb(*data, (CMOS_BASE_PORT + CMOS_PAGE1_DATA_PORT));
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}
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/* generate SMM call */
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if (host_control_smi_type == HC_SMITYPE_TYPE3)
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outb(ESM_APM_CMD, PCAT_APM_CONTROL_PORT);
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else
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outb(ESM_APM_CMD, PE1400_APM_CONTROL_PORT);
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/* restore RTC index pointer since it was written to above */
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CMOS_READ(RTC_REG_C);
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spin_unlock_irqrestore(&rtc_lock, flags);
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/* read control port back to serialize write */
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cmd_status = inb(PE1400_APM_CONTROL_PORT);
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/* wait a few to see if it executed */
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num_ticks = TIMEOUT_USEC_SHORT_SEMA_BLOCKING;
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while (apm_cmd->status == ESM_STATUS_CMD_UNSUCCESSFUL) {
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num_ticks--;
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if (num_ticks == EXPIRED_TIMER)
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return -ETIME;
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}
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break;
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default:
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dev_dbg(&dcdbas_pdev->dev, "%s: invalid SMI type %u\n",
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__FUNCTION__, host_control_smi_type);
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return -ENOSYS;
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}
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return 0;
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}
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/**
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* dcdbas_host_control: initiate host control
|
|
*
|
|
* This function is called by the driver after the system has
|
|
* finished shutting down if the user application specified a
|
|
* host control action to perform on shutdown. It is safe to
|
|
* use smi_data_buf at this point because the system has finished
|
|
* shutting down and no userspace apps are running.
|
|
*/
|
|
static void dcdbas_host_control(void)
|
|
{
|
|
struct apm_cmd *apm_cmd;
|
|
u8 action;
|
|
|
|
if (host_control_action == HC_ACTION_NONE)
|
|
return;
|
|
|
|
action = host_control_action;
|
|
host_control_action = HC_ACTION_NONE;
|
|
|
|
if (!smi_data_buf) {
|
|
dev_dbg(&dcdbas_pdev->dev, "%s: no SMI buffer\n", __FUNCTION__);
|
|
return;
|
|
}
|
|
|
|
if (smi_data_buf_size < sizeof(struct apm_cmd)) {
|
|
dev_dbg(&dcdbas_pdev->dev, "%s: SMI buffer too small\n",
|
|
__FUNCTION__);
|
|
return;
|
|
}
|
|
|
|
apm_cmd = (struct apm_cmd *)smi_data_buf;
|
|
|
|
/* power off takes precedence */
|
|
if (action & HC_ACTION_HOST_CONTROL_POWEROFF) {
|
|
apm_cmd->command = ESM_APM_POWER_CYCLE;
|
|
apm_cmd->reserved = 0;
|
|
*((s16 *)&apm_cmd->parameters.shortreq.parm[0]) = (s16) 0;
|
|
host_control_smi();
|
|
} else if (action & HC_ACTION_HOST_CONTROL_POWERCYCLE) {
|
|
apm_cmd->command = ESM_APM_POWER_CYCLE;
|
|
apm_cmd->reserved = 0;
|
|
*((s16 *)&apm_cmd->parameters.shortreq.parm[0]) = (s16) 20;
|
|
host_control_smi();
|
|
}
|
|
}
|
|
|
|
/**
|
|
* dcdbas_reboot_notify: handle reboot notification for host control
|
|
*/
|
|
static int dcdbas_reboot_notify(struct notifier_block *nb, unsigned long code,
|
|
void *unused)
|
|
{
|
|
switch (code) {
|
|
case SYS_DOWN:
|
|
case SYS_HALT:
|
|
case SYS_POWER_OFF:
|
|
if (host_control_on_shutdown) {
|
|
/* firmware is going to perform host control action */
|
|
printk(KERN_WARNING "Please wait for shutdown "
|
|
"action to complete...\n");
|
|
dcdbas_host_control();
|
|
}
|
|
break;
|
|
}
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block dcdbas_reboot_nb = {
|
|
.notifier_call = dcdbas_reboot_notify,
|
|
.next = NULL,
|
|
.priority = INT_MIN
|
|
};
|
|
|
|
static DCDBAS_BIN_ATTR_RW(smi_data);
|
|
|
|
static struct bin_attribute *dcdbas_bin_attrs[] = {
|
|
&bin_attr_smi_data,
|
|
NULL
|
|
};
|
|
|
|
static DCDBAS_DEV_ATTR_RW(smi_data_buf_size);
|
|
static DCDBAS_DEV_ATTR_RO(smi_data_buf_phys_addr);
|
|
static DCDBAS_DEV_ATTR_WO(smi_request);
|
|
static DCDBAS_DEV_ATTR_RW(host_control_action);
|
|
static DCDBAS_DEV_ATTR_RW(host_control_smi_type);
|
|
static DCDBAS_DEV_ATTR_RW(host_control_on_shutdown);
|
|
|
|
static struct attribute *dcdbas_dev_attrs[] = {
|
|
&dev_attr_smi_data_buf_size.attr,
|
|
&dev_attr_smi_data_buf_phys_addr.attr,
|
|
&dev_attr_smi_request.attr,
|
|
&dev_attr_host_control_action.attr,
|
|
&dev_attr_host_control_smi_type.attr,
|
|
&dev_attr_host_control_on_shutdown.attr,
|
|
NULL
|
|
};
|
|
|
|
static struct attribute_group dcdbas_attr_group = {
|
|
.attrs = dcdbas_dev_attrs,
|
|
};
|
|
|
|
static int __devinit dcdbas_probe(struct platform_device *dev)
|
|
{
|
|
int i, error;
|
|
|
|
host_control_action = HC_ACTION_NONE;
|
|
host_control_smi_type = HC_SMITYPE_NONE;
|
|
|
|
/*
|
|
* BIOS SMI calls require buffer addresses be in 32-bit address space.
|
|
* This is done by setting the DMA mask below.
|
|
*/
|
|
dcdbas_pdev->dev.coherent_dma_mask = DMA_32BIT_MASK;
|
|
dcdbas_pdev->dev.dma_mask = &dcdbas_pdev->dev.coherent_dma_mask;
|
|
|
|
error = sysfs_create_group(&dev->dev.kobj, &dcdbas_attr_group);
|
|
if (error)
|
|
return error;
|
|
|
|
for (i = 0; dcdbas_bin_attrs[i]; i++) {
|
|
error = sysfs_create_bin_file(&dev->dev.kobj,
|
|
dcdbas_bin_attrs[i]);
|
|
if (error) {
|
|
while (--i >= 0)
|
|
sysfs_remove_bin_file(&dev->dev.kobj,
|
|
dcdbas_bin_attrs[i]);
|
|
sysfs_create_group(&dev->dev.kobj, &dcdbas_attr_group);
|
|
return error;
|
|
}
|
|
}
|
|
|
|
register_reboot_notifier(&dcdbas_reboot_nb);
|
|
|
|
dev_info(&dev->dev, "%s (version %s)\n",
|
|
DRIVER_DESCRIPTION, DRIVER_VERSION);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __devexit dcdbas_remove(struct platform_device *dev)
|
|
{
|
|
int i;
|
|
|
|
unregister_reboot_notifier(&dcdbas_reboot_nb);
|
|
for (i = 0; dcdbas_bin_attrs[i]; i++)
|
|
sysfs_remove_bin_file(&dev->dev.kobj, dcdbas_bin_attrs[i]);
|
|
sysfs_remove_group(&dev->dev.kobj, &dcdbas_attr_group);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver dcdbas_driver = {
|
|
.driver = {
|
|
.name = DRIVER_NAME,
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = dcdbas_probe,
|
|
.remove = __devexit_p(dcdbas_remove),
|
|
};
|
|
|
|
/**
|
|
* dcdbas_init: initialize driver
|
|
*/
|
|
static int __init dcdbas_init(void)
|
|
{
|
|
int error;
|
|
|
|
error = platform_driver_register(&dcdbas_driver);
|
|
if (error)
|
|
return error;
|
|
|
|
dcdbas_pdev = platform_device_alloc(DRIVER_NAME, -1);
|
|
if (!dcdbas_pdev) {
|
|
error = -ENOMEM;
|
|
goto err_unregister_driver;
|
|
}
|
|
|
|
error = platform_device_add(dcdbas_pdev);
|
|
if (error)
|
|
goto err_free_device;
|
|
|
|
return 0;
|
|
|
|
err_free_device:
|
|
platform_device_put(dcdbas_pdev);
|
|
err_unregister_driver:
|
|
platform_driver_unregister(&dcdbas_driver);
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* dcdbas_exit: perform driver cleanup
|
|
*/
|
|
static void __exit dcdbas_exit(void)
|
|
{
|
|
/*
|
|
* make sure functions that use dcdbas_pdev are called
|
|
* before platform_device_unregister
|
|
*/
|
|
unregister_reboot_notifier(&dcdbas_reboot_nb);
|
|
smi_data_buf_free();
|
|
platform_device_unregister(dcdbas_pdev);
|
|
platform_driver_unregister(&dcdbas_driver);
|
|
|
|
/*
|
|
* We have to free the buffer here instead of dcdbas_remove
|
|
* because only in module exit function we can be sure that
|
|
* all sysfs attributes belonging to this module have been
|
|
* released.
|
|
*/
|
|
smi_data_buf_free();
|
|
}
|
|
|
|
module_init(dcdbas_init);
|
|
module_exit(dcdbas_exit);
|
|
|
|
MODULE_DESCRIPTION(DRIVER_DESCRIPTION " (version " DRIVER_VERSION ")");
|
|
MODULE_VERSION(DRIVER_VERSION);
|
|
MODULE_AUTHOR("Dell Inc.");
|
|
MODULE_LICENSE("GPL");
|
|
|