ALSA: usb: caiaq: audio: use irqsave() in USB's complete callback

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>

diff --git a/sound/usb/caiaq/audio.c b/sound/usb/caiaq/audio.c
index f35d29f49ffe13afae1501c219d500e8f3212383..15344d39a6cdb805e29590a20d815814bbda7c7e 100644 (file)
--- 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;