mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 02:39:48 +00:00
![Matthew Ma](/assets/img/avatar_default.png)
SDIO tuple is only allocated for standard SDIO card, especially it causes
memory corruption issues when the non-standard SDIO card has removed, which
is because the card device's reference counter does not increase for it at
sdio_init_func(), but all SDIO card device reference counter gets decreased
at sdio_release_func().
Fixes: 6f51be3d37
("sdio: allow non-standard SDIO cards")
Signed-off-by: Matthew Ma <mahongwei@zeku.com>
Reviewed-by: Weizhao Ouyang <ouyangweizhao@zeku.com>
Reviewed-by: John Wang <wangdayu@zeku.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20221014034951.2300386-1-ouyangweizhao@zeku.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
387 lines
9.1 KiB
C
387 lines
9.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* linux/drivers/mmc/core/sdio_bus.c
|
|
*
|
|
* Copyright 2007 Pierre Ossman
|
|
*
|
|
* SDIO function driver model
|
|
*/
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/err.h>
|
|
#include <linux/export.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/pm_runtime.h>
|
|
#include <linux/pm_domain.h>
|
|
#include <linux/acpi.h>
|
|
#include <linux/sysfs.h>
|
|
|
|
#include <linux/mmc/card.h>
|
|
#include <linux/mmc/host.h>
|
|
#include <linux/mmc/sdio_func.h>
|
|
#include <linux/of.h>
|
|
|
|
#include "core.h"
|
|
#include "card.h"
|
|
#include "sdio_cis.h"
|
|
#include "sdio_bus.h"
|
|
|
|
#define to_sdio_driver(d) container_of(d, struct sdio_driver, drv)
|
|
|
|
/* show configuration fields */
|
|
#define sdio_config_attr(field, format_string, args...) \
|
|
static ssize_t \
|
|
field##_show(struct device *dev, struct device_attribute *attr, char *buf) \
|
|
{ \
|
|
struct sdio_func *func; \
|
|
\
|
|
func = dev_to_sdio_func (dev); \
|
|
return sysfs_emit(buf, format_string, args); \
|
|
} \
|
|
static DEVICE_ATTR_RO(field)
|
|
|
|
sdio_config_attr(class, "0x%02x\n", func->class);
|
|
sdio_config_attr(vendor, "0x%04x\n", func->vendor);
|
|
sdio_config_attr(device, "0x%04x\n", func->device);
|
|
sdio_config_attr(revision, "%u.%u\n", func->major_rev, func->minor_rev);
|
|
sdio_config_attr(modalias, "sdio:c%02Xv%04Xd%04X\n", func->class, func->vendor, func->device);
|
|
|
|
#define sdio_info_attr(num) \
|
|
static ssize_t info##num##_show(struct device *dev, struct device_attribute *attr, char *buf) \
|
|
{ \
|
|
struct sdio_func *func = dev_to_sdio_func(dev); \
|
|
\
|
|
if (num > func->num_info) \
|
|
return -ENODATA; \
|
|
if (!func->info[num - 1][0]) \
|
|
return 0; \
|
|
return sysfs_emit(buf, "%s\n", func->info[num - 1]); \
|
|
} \
|
|
static DEVICE_ATTR_RO(info##num)
|
|
|
|
sdio_info_attr(1);
|
|
sdio_info_attr(2);
|
|
sdio_info_attr(3);
|
|
sdio_info_attr(4);
|
|
|
|
static struct attribute *sdio_dev_attrs[] = {
|
|
&dev_attr_class.attr,
|
|
&dev_attr_vendor.attr,
|
|
&dev_attr_device.attr,
|
|
&dev_attr_revision.attr,
|
|
&dev_attr_info1.attr,
|
|
&dev_attr_info2.attr,
|
|
&dev_attr_info3.attr,
|
|
&dev_attr_info4.attr,
|
|
&dev_attr_modalias.attr,
|
|
NULL,
|
|
};
|
|
ATTRIBUTE_GROUPS(sdio_dev);
|
|
|
|
static const struct sdio_device_id *sdio_match_one(struct sdio_func *func,
|
|
const struct sdio_device_id *id)
|
|
{
|
|
if (id->class != (__u8)SDIO_ANY_ID && id->class != func->class)
|
|
return NULL;
|
|
if (id->vendor != (__u16)SDIO_ANY_ID && id->vendor != func->vendor)
|
|
return NULL;
|
|
if (id->device != (__u16)SDIO_ANY_ID && id->device != func->device)
|
|
return NULL;
|
|
return id;
|
|
}
|
|
|
|
static const struct sdio_device_id *sdio_match_device(struct sdio_func *func,
|
|
struct sdio_driver *sdrv)
|
|
{
|
|
const struct sdio_device_id *ids;
|
|
|
|
ids = sdrv->id_table;
|
|
|
|
if (ids) {
|
|
while (ids->class || ids->vendor || ids->device) {
|
|
if (sdio_match_one(func, ids))
|
|
return ids;
|
|
ids++;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int sdio_bus_match(struct device *dev, struct device_driver *drv)
|
|
{
|
|
struct sdio_func *func = dev_to_sdio_func(dev);
|
|
struct sdio_driver *sdrv = to_sdio_driver(drv);
|
|
|
|
if (sdio_match_device(func, sdrv))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
sdio_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
|
|
{
|
|
struct sdio_func *func = dev_to_sdio_func(dev);
|
|
unsigned int i;
|
|
|
|
if (add_uevent_var(env,
|
|
"SDIO_CLASS=%02X", func->class))
|
|
return -ENOMEM;
|
|
|
|
if (add_uevent_var(env,
|
|
"SDIO_ID=%04X:%04X", func->vendor, func->device))
|
|
return -ENOMEM;
|
|
|
|
if (add_uevent_var(env,
|
|
"SDIO_REVISION=%u.%u", func->major_rev, func->minor_rev))
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < func->num_info; i++) {
|
|
if (add_uevent_var(env, "SDIO_INFO%u=%s", i+1, func->info[i]))
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (add_uevent_var(env,
|
|
"MODALIAS=sdio:c%02Xv%04Xd%04X",
|
|
func->class, func->vendor, func->device))
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sdio_bus_probe(struct device *dev)
|
|
{
|
|
struct sdio_driver *drv = to_sdio_driver(dev->driver);
|
|
struct sdio_func *func = dev_to_sdio_func(dev);
|
|
const struct sdio_device_id *id;
|
|
int ret;
|
|
|
|
id = sdio_match_device(func, drv);
|
|
if (!id)
|
|
return -ENODEV;
|
|
|
|
ret = dev_pm_domain_attach(dev, false);
|
|
if (ret)
|
|
return ret;
|
|
|
|
atomic_inc(&func->card->sdio_funcs_probed);
|
|
|
|
/* Unbound SDIO functions are always suspended.
|
|
* During probe, the function is set active and the usage count
|
|
* is incremented. If the driver supports runtime PM,
|
|
* it should call pm_runtime_put_noidle() in its probe routine and
|
|
* pm_runtime_get_noresume() in its remove routine.
|
|
*/
|
|
if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD) {
|
|
ret = pm_runtime_get_sync(dev);
|
|
if (ret < 0)
|
|
goto disable_runtimepm;
|
|
}
|
|
|
|
/* Set the default block size so the driver is sure it's something
|
|
* sensible. */
|
|
sdio_claim_host(func);
|
|
if (mmc_card_removed(func->card))
|
|
ret = -ENOMEDIUM;
|
|
else
|
|
ret = sdio_set_block_size(func, 0);
|
|
sdio_release_host(func);
|
|
if (ret)
|
|
goto disable_runtimepm;
|
|
|
|
ret = drv->probe(func, id);
|
|
if (ret)
|
|
goto disable_runtimepm;
|
|
|
|
return 0;
|
|
|
|
disable_runtimepm:
|
|
atomic_dec(&func->card->sdio_funcs_probed);
|
|
if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
|
|
pm_runtime_put_noidle(dev);
|
|
dev_pm_domain_detach(dev, false);
|
|
return ret;
|
|
}
|
|
|
|
static void sdio_bus_remove(struct device *dev)
|
|
{
|
|
struct sdio_driver *drv = to_sdio_driver(dev->driver);
|
|
struct sdio_func *func = dev_to_sdio_func(dev);
|
|
|
|
/* Make sure card is powered before invoking ->remove() */
|
|
if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
|
|
pm_runtime_get_sync(dev);
|
|
|
|
drv->remove(func);
|
|
atomic_dec(&func->card->sdio_funcs_probed);
|
|
|
|
if (func->irq_handler) {
|
|
pr_warn("WARNING: driver %s did not remove its interrupt handler!\n",
|
|
drv->name);
|
|
sdio_claim_host(func);
|
|
sdio_release_irq(func);
|
|
sdio_release_host(func);
|
|
}
|
|
|
|
/* First, undo the increment made directly above */
|
|
if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
|
|
pm_runtime_put_noidle(dev);
|
|
|
|
/* Then undo the runtime PM settings in sdio_bus_probe() */
|
|
if (func->card->host->caps & MMC_CAP_POWER_OFF_CARD)
|
|
pm_runtime_put_sync(dev);
|
|
|
|
dev_pm_domain_detach(dev, false);
|
|
}
|
|
|
|
static const struct dev_pm_ops sdio_bus_pm_ops = {
|
|
SET_SYSTEM_SLEEP_PM_OPS(pm_generic_suspend, pm_generic_resume)
|
|
SET_RUNTIME_PM_OPS(
|
|
pm_generic_runtime_suspend,
|
|
pm_generic_runtime_resume,
|
|
NULL
|
|
)
|
|
};
|
|
|
|
static struct bus_type sdio_bus_type = {
|
|
.name = "sdio",
|
|
.dev_groups = sdio_dev_groups,
|
|
.match = sdio_bus_match,
|
|
.uevent = sdio_bus_uevent,
|
|
.probe = sdio_bus_probe,
|
|
.remove = sdio_bus_remove,
|
|
.pm = &sdio_bus_pm_ops,
|
|
};
|
|
|
|
int sdio_register_bus(void)
|
|
{
|
|
return bus_register(&sdio_bus_type);
|
|
}
|
|
|
|
void sdio_unregister_bus(void)
|
|
{
|
|
bus_unregister(&sdio_bus_type);
|
|
}
|
|
|
|
/**
|
|
* sdio_register_driver - register a function driver
|
|
* @drv: SDIO function driver
|
|
*/
|
|
int sdio_register_driver(struct sdio_driver *drv)
|
|
{
|
|
drv->drv.name = drv->name;
|
|
drv->drv.bus = &sdio_bus_type;
|
|
return driver_register(&drv->drv);
|
|
}
|
|
EXPORT_SYMBOL_GPL(sdio_register_driver);
|
|
|
|
/**
|
|
* sdio_unregister_driver - unregister a function driver
|
|
* @drv: SDIO function driver
|
|
*/
|
|
void sdio_unregister_driver(struct sdio_driver *drv)
|
|
{
|
|
drv->drv.bus = &sdio_bus_type;
|
|
driver_unregister(&drv->drv);
|
|
}
|
|
EXPORT_SYMBOL_GPL(sdio_unregister_driver);
|
|
|
|
static void sdio_release_func(struct device *dev)
|
|
{
|
|
struct sdio_func *func = dev_to_sdio_func(dev);
|
|
|
|
if (!(func->card->quirks & MMC_QUIRK_NONSTD_SDIO))
|
|
sdio_free_func_cis(func);
|
|
|
|
kfree(func->info);
|
|
kfree(func->tmpbuf);
|
|
kfree(func);
|
|
}
|
|
|
|
/*
|
|
* Allocate and initialise a new SDIO function structure.
|
|
*/
|
|
struct sdio_func *sdio_alloc_func(struct mmc_card *card)
|
|
{
|
|
struct sdio_func *func;
|
|
|
|
func = kzalloc(sizeof(struct sdio_func), GFP_KERNEL);
|
|
if (!func)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
/*
|
|
* allocate buffer separately to make sure it's properly aligned for
|
|
* DMA usage (incl. 64 bit DMA)
|
|
*/
|
|
func->tmpbuf = kmalloc(4, GFP_KERNEL);
|
|
if (!func->tmpbuf) {
|
|
kfree(func);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
func->card = card;
|
|
|
|
device_initialize(&func->dev);
|
|
|
|
func->dev.parent = &card->dev;
|
|
func->dev.bus = &sdio_bus_type;
|
|
func->dev.release = sdio_release_func;
|
|
|
|
return func;
|
|
}
|
|
|
|
#ifdef CONFIG_ACPI
|
|
static void sdio_acpi_set_handle(struct sdio_func *func)
|
|
{
|
|
struct mmc_host *host = func->card->host;
|
|
u64 addr = ((u64)host->slotno << 16) | func->num;
|
|
|
|
acpi_preset_companion(&func->dev, ACPI_COMPANION(host->parent), addr);
|
|
}
|
|
#else
|
|
static inline void sdio_acpi_set_handle(struct sdio_func *func) {}
|
|
#endif
|
|
|
|
static void sdio_set_of_node(struct sdio_func *func)
|
|
{
|
|
struct mmc_host *host = func->card->host;
|
|
|
|
func->dev.of_node = mmc_of_find_child_device(host, func->num);
|
|
}
|
|
|
|
/*
|
|
* Register a new SDIO function with the driver model.
|
|
*/
|
|
int sdio_add_func(struct sdio_func *func)
|
|
{
|
|
int ret;
|
|
|
|
dev_set_name(&func->dev, "%s:%d", mmc_card_id(func->card), func->num);
|
|
|
|
sdio_set_of_node(func);
|
|
sdio_acpi_set_handle(func);
|
|
device_enable_async_suspend(&func->dev);
|
|
ret = device_add(&func->dev);
|
|
if (ret == 0)
|
|
sdio_func_set_present(func);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Unregister a SDIO function with the driver model, and
|
|
* (eventually) free it.
|
|
* This function can be called through error paths where sdio_add_func() was
|
|
* never executed (because a failure occurred at an earlier point).
|
|
*/
|
|
void sdio_remove_func(struct sdio_func *func)
|
|
{
|
|
if (!sdio_func_present(func))
|
|
return;
|
|
|
|
device_del(&func->dev);
|
|
of_node_put(func->dev.of_node);
|
|
put_device(&func->dev);
|
|
}
|
|
|