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media: tm6000: use irqsave() in USB's complete callback

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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.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sebastian Andrzej Siewior 2018-09-10 11:19:59 +02:00 committed by Greg Kroah-Hartman
parent 273925c777
commit 3f3ff6e0d8
1 changed files with 3 additions and 2 deletions
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5
drivers/media/usb/tm6000/tm6000-video.c
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@ -419,6 +419,7 @@ static void tm6000_irq_callback(struct urb *urb)
{ {
struct tm6000_dmaqueue *dma_q = urb->context; struct tm6000_dmaqueue *dma_q = urb->context;
struct tm6000_core *dev = container_of(dma_q, struct tm6000_core, vidq); struct tm6000_core *dev = container_of(dma_q, struct tm6000_core, vidq);
unsigned long flags;
int i; int i;
switch (urb->status) { switch (urb->status) {
@ -436,9 +437,9 @@ static void tm6000_irq_callback(struct urb *urb)
break; break;
} }
spin_lock(&dev->slock); spin_lock_irqsave(&dev->slock, flags);
tm6000_isoc_copy(urb); tm6000_isoc_copy(urb);
spin_unlock(&dev->slock); spin_unlock_irqrestore(&dev->slock, flags);
/* Reset urb buffers */ /* Reset urb buffers */
for (i = 0; i < urb->number_of_packets; i++) { for (i = 0; i < urb->number_of_packets; i++) {