From: Oliver Neukum Date: Tue, 6 Mar 2007 09:47:04 +0000 (+0100) Subject: USB: fix spinlock recursion in cdc-acm.c X-Git-Tag: firefly_0821_release~30698^2~1 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=834dbca5b6b79ddb7cf56001ea7b6d4481fdf1e7;p=firefly-linux-kernel-4.4.55.git USB: fix spinlock recursion in cdc-acm.c this fixes the spinlock recursion issue. The older fix was incomplete. Signed-off-by: Oliver Neukum Acked-by: Pete Zaitcev Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index d38a25f36ea5..31ae661e586a 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -332,9 +332,9 @@ static void acm_rx_tasklet(unsigned long _acm) if (!ACM_READY(acm)) return; - spin_lock(&acm->throttle_lock); + spin_lock_irqsave(&acm->throttle_lock, flags); throttled = acm->throttle; - spin_unlock(&acm->throttle_lock); + spin_unlock_irqrestore(&acm->throttle_lock, flags); if (throttled) return; @@ -352,9 +352,9 @@ next_buffer: dbg("acm_rx_tasklet: procesing buf 0x%p, size = %d", buf, buf->size); tty_buffer_request_room(tty, buf->size); - spin_lock(&acm->throttle_lock); + spin_lock_irqsave(&acm->throttle_lock, flags); throttled = acm->throttle; - spin_unlock(&acm->throttle_lock); + spin_unlock_irqrestore(&acm->throttle_lock, flags); if (!throttled) tty_insert_flip_string(tty, buf->base, buf->size); tty_flip_buffer_push(tty);