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brcmfmac: Fix race condition in msgbuf ioctl processing.

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Msgbuf is using a wait_event_timeout to wait for the response on
an ioctl. The wakeup routine uses waitqueue_active to see if
wait_event_timeout has been called. There is a chance that the
response arrives before wait_event_timeout is called, this
will result in situation that wait_event_timeout never gets
woken again and assumed result will be a timeout. This patch
removes that errornous situation by always setting the
ctl_completed var before checking for queue active.

Reviewed-by: Arend Van Spriel <arend@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Signed-off-by: Hante Meuleman <meuleman@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Hante Meuleman 2015-03-06 18:40:41 +01:00 committed by Kalle Valo
parent 449e58b85c
commit d375bc8a85
1 changed files with 2 additions and 3 deletions
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5
drivers/net/wireless/brcm80211/brcmfmac/msgbuf.c
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@ -481,10 +481,9 @@ static int brcmf_msgbuf_ioctl_resp_wait(struct brcmf_msgbuf *msgbuf)
static void brcmf_msgbuf_ioctl_resp_wake(struct brcmf_msgbuf *msgbuf)
{
if (waitqueue_active(&msgbuf->ioctl_resp_wait)) {
msgbuf->ctl_completed = true;
msgbuf->ctl_completed = true;
if (waitqueue_active(&msgbuf->ioctl_resp_wait))
wake_up(&msgbuf->ioctl_resp_wait);
}
}