usb: gadget: f_fs: edit epfile->ep under lock
epfile->ep is protected by ffs->eps_lock (not epfile->mutex) so clear it
while holding the spin lock.
Tested-by: John Stultz <john.stultz@linaro.org>
Tested-by: Chen Yu <chenyu56@huawei.com>
Signed-off-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
index 54ad100..b31aa95 100644
--- a/drivers/usb/gadget/function/f_fs.c
+++ b/drivers/usb/gadget/function/f_fs.c
@@ -1725,17 +1725,17 @@ static void ffs_func_eps_disable(struct ffs_function *func)
unsigned long flags;
do {
- if (epfile)
- mutex_lock(&epfile->mutex);
spin_lock_irqsave(&func->ffs->eps_lock, flags);
/* pending requests get nuked */
if (likely(ep->ep))
usb_ep_disable(ep->ep);
++ep;
+ if (epfile)
+ epfile->ep = NULL;
spin_unlock_irqrestore(&func->ffs->eps_lock, flags);
if (epfile) {
- epfile->ep = NULL;
+ mutex_lock(&epfile->mutex);
kfree(epfile->read_buffer);
epfile->read_buffer = NULL;
mutex_unlock(&epfile->mutex);