While testing Fabio's patch I hit lockdep warning about possible
deadlock:
[ 252.063305] WARNING: possible recursive locking detected
[ 252.063642] 5.14.0+ #9 Tainted: G C
[ 252.063946] --------------------------------------------
[ 252.064282] ip/335 is trying to acquire lock:
[ 252.064560]
ffff888009ebad28 (pmutex){+.+.}-{4:4}, at: usbctrl_vendorreq+0xc5/0x4a0 [r8188eu]
[ 252.065168]
[ 252.065168] but task is already holding lock:
[ 252.065536]
ffffffffc021b3b8 (pmutex){+.+.}-{4:4}, at: netdev_open+0x3a/0x5f [r8188eu]
[ 252.066085]
[ 252.066085] other info that might help us debug this:
[ 252.066494] Possible unsafe locking scenario:
[ 252.066494]
[ 252.066866] CPU0
[ 252.067025] ----
[ 252.067184] lock(pmutex);
[ 252.067367] lock(pmutex);
There is one problem with this warning: there is no pmutex in this
driver, *BUT* all mutexes are initialized via private _rtw_mutex_init
API, which had struct mutex *pmutex argument.
So, all mutexes in this driver had same name in lockdep map. Of course,
lockdep will complain about any nested locking.
Fix it by open-coding _rtw_mutex_{init,free} wrappers, because we do not
need them at all.
Cc: Fabio M. De Francesco <fmdefrancesco@gmail.com>
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Link: https://lore.kernel.org/r/20210904124747.30050-1-paskripkin@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
struct hal_data_8188e *pHalData = GET_HAL_DATA(padapter);
struct sreset_priv *psrtpriv = &pHalData->srestpriv;
- _rtw_mutex_init(&psrtpriv->silentreset_mutex);
+ mutex_init(&psrtpriv->silentreset_mutex);
psrtpriv->silent_reset_inprogress = false;
psrtpriv->wifi_error_status = WIFI_STATUS_SUCCESS;
psrtpriv->last_tx_time = 0;
pxmitpriv->voq_cnt = 0;
pxmitpriv->ack_tx = false;
- _rtw_mutex_init(&pxmitpriv->ack_tx_mutex);
+ mutex_init(&pxmitpriv->ack_tx_mutex);
rtw_sctx_init(&pxmitpriv->ack_tx_ops, 0);
rtw_hal_init_xmit_priv(padapter);
rtw_free_hwxmits(padapter);
- _rtw_mutex_free(&pxmitpriv->ack_tx_mutex);
+ mutex_destroy(&pxmitpriv->ack_tx_mutex);
}
static void update_attrib_vcs_info(struct adapter *padapter, struct xmit_frame *pxmitframe)
void *rtw_malloc2d(int h, int w, int size);
u32 _rtw_down_sema(struct semaphore *sema);
-void _rtw_mutex_init(struct mutex *pmutex);
-void _rtw_mutex_free(struct mutex *pmutex);
void _rtw_init_queue(struct __queue *pqueue);
return _SUCCESS;
}
-void _rtw_mutex_init(struct mutex *pmutex)
-{
- mutex_init(pmutex);
-}
-
-void _rtw_mutex_free(struct mutex *pmutex)
-{
- mutex_destroy(pmutex);
-}
-
void _rtw_init_queue(struct __queue *pqueue)
{
INIT_LIST_HEAD(&pqueue->queue);
{
u8 rst = _SUCCESS;
- _rtw_mutex_init(&dvobj->usb_vendor_req_mutex);
+ mutex_init(&dvobj->usb_vendor_req_mutex);
dvobj->usb_alloc_vendor_req_buf = kzalloc(MAX_USB_IO_CTL_SIZE, GFP_KERNEL);
if (!dvobj->usb_alloc_vendor_req_buf) {
static void rtw_deinit_intf_priv(struct dvobj_priv *dvobj)
{
kfree(dvobj->usb_alloc_vendor_req_buf);
- _rtw_mutex_free(&dvobj->usb_vendor_req_mutex);
+ mutex_destroy(&dvobj->usb_vendor_req_mutex);
}
static struct dvobj_priv *usb_dvobj_init(struct usb_interface *usb_intf)
{
DBG_88E(DRV_NAME " driver version=%s\n", DRIVERVERSION);
- _rtw_mutex_init(&usb_drv->hw_init_mutex);
+ mutex_init(&usb_drv->hw_init_mutex);
usb_drv->drv_registered = true;
return usb_register(&usb_drv->usbdrv);
usb_drv->drv_registered = false;
usb_deregister(&usb_drv->usbdrv);
- _rtw_mutex_free(&usb_drv->hw_init_mutex);
+ mutex_destroy(&usb_drv->hw_init_mutex);
DBG_88E("-rtw_drv_halt\n");
}