From: John Ogness john.ogness@linutronix.de
The USB completion callback does not disable interrupts while acquiring the lock. We want to remove the local_irq_disable() invocation from __usb_hcd_giveback_urb() and therefore it is required for the callback handler to disable the interrupts while acquiring the lock. The callback may be invoked either in IRQ or BH context depending on the USB host controller. Use the _irqsave() variant of the locking primitives.
Cc: Daniel Mack zonque@gmail.com Cc: Jaroslav Kysela perex@perex.cz Cc: Takashi Iwai tiwai@suse.com Signed-off-by: John Ogness john.ogness@linutronix.de Signed-off-by: Sebastian Andrzej Siewior bigeasy@linutronix.de --- sound/usb/caiaq/audio.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/sound/usb/caiaq/audio.c b/sound/usb/caiaq/audio.c index f35d29f49ffe..15344d39a6cd 100644 --- a/sound/usb/caiaq/audio.c +++ b/sound/usb/caiaq/audio.c @@ -636,6 +636,7 @@ static void read_completed(struct urb *urb) struct device *dev; struct urb *out = NULL; int i, frame, len, send_it = 0, outframe = 0; + unsigned long flags; size_t offset = 0;
if (urb->status || !info) @@ -672,10 +673,10 @@ static void read_completed(struct urb *urb) offset += len;
if (len > 0) { - spin_lock(&cdev->spinlock); + spin_lock_irqsave(&cdev->spinlock, flags); fill_out_urb(cdev, out, &out->iso_frame_desc[outframe]); read_in_urb(cdev, urb, &urb->iso_frame_desc[frame]); - spin_unlock(&cdev->spinlock); + spin_unlock_irqrestore(&cdev->spinlock, flags); check_for_elapsed_periods(cdev, cdev->sub_playback); check_for_elapsed_periods(cdev, cdev->sub_capture); send_it = 1;