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![Larry Finger](/assets/img/avatar_default.png)
I am preparing to convert this driver from semaphore to mutex locking, The first step has been to eliminate a number of semaphores that were initialized but never used, and one whose only use was a single "up" after initialization. A total of 9 semaphores were removed in this process. One other change was to remove some inline semaphore routines that were unused. In addition, several cases had the following structure: down() if () { ... } up() The locking overhead was reduced by moving the up/down inside the if block. Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
160 lines
4.9 KiB
C
160 lines
4.9 KiB
C
/******************************************************************************
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* rtl871x_io.c
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*
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* Copyright(c) 2007 - 2010 Realtek Corporation. All rights reserved.
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* Linux device driver for RTL8192SU
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
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*
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* Modifications for inclusion into the Linux staging tree are
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* Copyright(c) 2010 Larry Finger. All rights reserved.
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*
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* Contact information:
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* WLAN FAE <wlanfae@realtek.com>
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* Larry Finger <Larry.Finger@lwfinger.net>
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*
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******************************************************************************/
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/*
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*
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* The purpose of rtl871x_io.c
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*
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* a. provides the API
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* b. provides the protocol engine
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* c. provides the software interface between caller and the hardware interface
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*
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* For r8712u, both sync/async operations are provided.
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*
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* Only sync read/write_mem operations are provided.
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*
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*/
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#define _RTL871X_IO_C_
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#include "osdep_service.h"
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#include "drv_types.h"
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#include "rtl871x_io.h"
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#include "osdep_intf.h"
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#include "usb_ops.h"
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static uint _init_intf_hdl(struct _adapter *padapter,
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struct intf_hdl *pintf_hdl)
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{
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struct intf_priv *pintf_priv;
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void (*set_intf_option)(u32 *poption) = NULL;
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void (*set_intf_funs)(struct intf_hdl *pintf_hdl);
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void (*set_intf_ops)(struct _io_ops *pops);
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uint (*init_intf_priv)(struct intf_priv *pintfpriv);
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set_intf_option = &(r8712_usb_set_intf_option);
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set_intf_funs = &(r8712_usb_set_intf_funs);
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set_intf_ops = &r8712_usb_set_intf_ops;
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init_intf_priv = &r8712_usb_init_intf_priv;
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pintf_priv = pintf_hdl->pintfpriv = (struct intf_priv *)
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_malloc(sizeof(struct intf_priv));
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if (pintf_priv == NULL)
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goto _init_intf_hdl_fail;
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pintf_hdl->adapter = (u8 *)padapter;
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set_intf_option(&pintf_hdl->intf_option);
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set_intf_funs(pintf_hdl);
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set_intf_ops(&pintf_hdl->io_ops);
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pintf_priv->intf_dev = (u8 *)&(padapter->dvobjpriv);
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if (init_intf_priv(pintf_priv) == _FAIL)
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goto _init_intf_hdl_fail;
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return _SUCCESS;
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_init_intf_hdl_fail:
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kfree(pintf_priv);
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return _FAIL;
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}
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static void _unload_intf_hdl(struct intf_priv *pintfpriv)
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{
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void (*unload_intf_priv)(struct intf_priv *pintfpriv);
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unload_intf_priv = &r8712_usb_unload_intf_priv;
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unload_intf_priv(pintfpriv);
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kfree(pintfpriv);
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}
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static uint register_intf_hdl(u8 *dev, struct intf_hdl *pintfhdl)
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{
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struct _adapter *adapter = (struct _adapter *)dev;
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pintfhdl->intf_option = 0;
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pintfhdl->adapter = dev;
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pintfhdl->intf_dev = (u8 *)&(adapter->dvobjpriv);
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if (_init_intf_hdl(adapter, pintfhdl) == false)
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goto register_intf_hdl_fail;
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return _SUCCESS;
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register_intf_hdl_fail:
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return false;
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}
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static void unregister_intf_hdl(struct intf_hdl *pintfhdl)
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{
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_unload_intf_hdl(pintfhdl->pintfpriv);
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memset((u8 *)pintfhdl, 0, sizeof(struct intf_hdl));
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}
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uint r8712_alloc_io_queue(struct _adapter *adapter)
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{
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u32 i;
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struct io_queue *pio_queue;
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struct io_req *pio_req;
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pio_queue = (struct io_queue *)_malloc(sizeof(struct io_queue));
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if (pio_queue == NULL)
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goto alloc_io_queue_fail;
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_init_listhead(&pio_queue->free_ioreqs);
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_init_listhead(&pio_queue->processing);
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_init_listhead(&pio_queue->pending);
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spin_lock_init(&pio_queue->lock);
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pio_queue->pallocated_free_ioreqs_buf = (u8 *)_malloc(NUM_IOREQ *
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(sizeof(struct io_req)) + 4);
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if ((pio_queue->pallocated_free_ioreqs_buf) == NULL)
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goto alloc_io_queue_fail;
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memset(pio_queue->pallocated_free_ioreqs_buf, 0,
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(NUM_IOREQ * (sizeof(struct io_req)) + 4));
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pio_queue->free_ioreqs_buf = pio_queue->pallocated_free_ioreqs_buf + 4
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- ((addr_t)(pio_queue->pallocated_free_ioreqs_buf)
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& 3);
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pio_req = (struct io_req *)(pio_queue->free_ioreqs_buf);
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for (i = 0; i < NUM_IOREQ; i++) {
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_init_listhead(&pio_req->list);
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list_insert_tail(&pio_req->list, &pio_queue->free_ioreqs);
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pio_req++;
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}
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if ((register_intf_hdl((u8 *)adapter, &(pio_queue->intf))) == _FAIL)
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goto alloc_io_queue_fail;
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adapter->pio_queue = pio_queue;
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return _SUCCESS;
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alloc_io_queue_fail:
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if (pio_queue) {
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kfree(pio_queue->pallocated_free_ioreqs_buf);
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kfree((u8 *)pio_queue);
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}
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adapter->pio_queue = NULL;
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return _FAIL;
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}
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void r8712_free_io_queue(struct _adapter *adapter)
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{
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struct io_queue *pio_queue = (struct io_queue *)(adapter->pio_queue);
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if (pio_queue) {
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kfree(pio_queue->pallocated_free_ioreqs_buf);
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adapter->pio_queue = NULL;
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unregister_intf_hdl(&pio_queue->intf);
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kfree((u8 *)pio_queue);
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}
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}
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