From d3ede18eeb4645c49c2de6eaad2439626407dd86 Mon Sep 17 00:00:00 2001 From: "Fabio M. De Francesco" Date: Sat, 28 Aug 2021 13:36:56 +0200 Subject: [PATCH] staging: r8188eu: Remove _enter/_exit_critical_mutex() Remove _enter_critical_mutex() and _exit_critical_mutex(). They are unnecessary wrappers, respectively to mutex_lock_interruptible() and to mutex_unlock(). They also have an odd interface that takes an unused argument named pirqL of type unsigned long. The original code enters the critical section if the mutex API is interrupted while waiting to acquire the lock; therefore it could lead to a race condition. Use mutex_lock() because it is uninterruptible and so avoid that above-mentioned potential race condition. Tested-by: Pavel Skripkin Reviewed-by: Pavel Skripkin Signed-off-by: Fabio M. De Francesco Link: https://lore.kernel.org/r/20210828113656.6963-1-fmdefrancesco@gmail.com Signed-off-by: Greg Kroah-Hartman --- drivers/staging/r8188eu/core/rtw_mlme_ext.c | 4 ++-- drivers/staging/r8188eu/hal/usb_ops_linux.c | 4 ++-- drivers/staging/r8188eu/include/osdep_service.h | 13 ------------- drivers/staging/r8188eu/os_dep/os_intfs.c | 4 ++-- 4 files changed, 6 insertions(+), 19 deletions(-) diff --git a/drivers/staging/r8188eu/core/rtw_mlme_ext.c b/drivers/staging/r8188eu/core/rtw_mlme_ext.c index 57cf74d30984..31672df0fb2b 100644 --- a/drivers/staging/r8188eu/core/rtw_mlme_ext.c +++ b/drivers/staging/r8188eu/core/rtw_mlme_ext.c @@ -4350,7 +4350,7 @@ s32 dump_mgntframe_and_wait_ack(struct adapter *padapter, struct xmit_frame *pmg if (padapter->bSurpriseRemoved || padapter->bDriverStopped) return -1; - _enter_critical_mutex(&pxmitpriv->ack_tx_mutex, NULL); + mutex_lock(&pxmitpriv->ack_tx_mutex); pxmitpriv->ack_tx = true; pmgntframe->ack_report = 1; @@ -4359,7 +4359,7 @@ s32 dump_mgntframe_and_wait_ack(struct adapter *padapter, struct xmit_frame *pmg } pxmitpriv->ack_tx = false; - _exit_critical_mutex(&pxmitpriv->ack_tx_mutex, NULL); + mutex_unlock(&pxmitpriv->ack_tx_mutex); return ret; } diff --git a/drivers/staging/r8188eu/hal/usb_ops_linux.c b/drivers/staging/r8188eu/hal/usb_ops_linux.c index 0cf69033c529..065b0d8e030a 100644 --- a/drivers/staging/r8188eu/hal/usb_ops_linux.c +++ b/drivers/staging/r8188eu/hal/usb_ops_linux.c @@ -29,7 +29,7 @@ static int usbctrl_vendorreq(struct intf_hdl *pintfhdl, u16 value, void *pdata, goto exit; } - _enter_critical_mutex(&dvobjpriv->usb_vendor_req_mutex, NULL); + mutex_lock(&dvobjpriv->usb_vendor_req_mutex); /* Acquire IO memory for vendorreq */ pIo_buf = dvobjpriv->usb_vendor_req_buf; @@ -92,7 +92,7 @@ static int usbctrl_vendorreq(struct intf_hdl *pintfhdl, u16 value, void *pdata, break; } release_mutex: - _exit_critical_mutex(&dvobjpriv->usb_vendor_req_mutex, NULL); + mutex_unlock(&dvobjpriv->usb_vendor_req_mutex); exit: return status; } diff --git a/drivers/staging/r8188eu/include/osdep_service.h b/drivers/staging/r8188eu/include/osdep_service.h index 05bac61c3a19..b832849bc308 100644 --- a/drivers/staging/r8188eu/include/osdep_service.h +++ b/drivers/staging/r8188eu/include/osdep_service.h @@ -56,19 +56,6 @@ static inline struct list_head *get_list_head(struct __queue *queue) return (&(queue->queue)); } -static inline int _enter_critical_mutex(struct mutex *pmutex, unsigned long *pirqL) -{ - int ret; - - ret = mutex_lock_interruptible(pmutex); - return ret; -} - -static inline void _exit_critical_mutex(struct mutex *pmutex, unsigned long *pirqL) -{ - mutex_unlock(pmutex); -} - static inline void rtw_list_delete(struct list_head *plist) { list_del_init(plist); diff --git a/drivers/staging/r8188eu/os_dep/os_intfs.c b/drivers/staging/r8188eu/os_dep/os_intfs.c index 49ccdde1b0bb..352d7320cfa9 100644 --- a/drivers/staging/r8188eu/os_dep/os_intfs.c +++ b/drivers/staging/r8188eu/os_dep/os_intfs.c @@ -1060,9 +1060,9 @@ int netdev_open(struct net_device *pnetdev) int ret; struct adapter *padapter = (struct adapter *)rtw_netdev_priv(pnetdev); - _enter_critical_mutex(padapter->hw_init_mutex, NULL); + mutex_lock(padapter->hw_init_mutex); ret = _netdev_open(pnetdev); - _exit_critical_mutex(padapter->hw_init_mutex, NULL); + mutex_unlock(padapter->hw_init_mutex); return ret; } -- 2.11.0