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ALSA: usb: caiaq: audio: 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: John Ogness <john.ogness@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Daniel Mack <daniel@zonque.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
John Ogness 2018-07-01 17:28:07 +02:00 committed by Takashi Iwai
parent 222bce5eb8
commit 9b11233d8e
1 changed files with 3 additions and 2 deletions
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5
sound/usb/caiaq/audio.c
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@ -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;