usb: usbtest: 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.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

diff --git a/drivers/usb/misc/usbtest.c b/drivers/usb/misc/usbtest.c
index 9e1142b8b91b4b5b71197115a20260e92844aa08..c7f82310e73ec3f933b6cff1e62dc37d367abe3f 100644 (file)
--- a/drivers/usb/misc/usbtest.c
+++ b/drivers/usb/misc/usbtest.c
@@ -1082,11 +1082,12 @@ static void ctrl_complete(struct urb *urb)
        struct usb_ctrlrequest  *reqp;
        struct subcase          *subcase;
        int                     status = urb->status;
+       unsigned long           flags;
 
        reqp = (struct usb_ctrlrequest *)urb->setup_packet;
        subcase = container_of(reqp, struct subcase, setup);
 
-       spin_lock(&ctx->lock);
+       spin_lock_irqsave(&ctx->lock, flags);
        ctx->count--;
        ctx->pending--;
 
@@ -1185,7 +1186,7 @@ error:
        /* signal completion when nothing's queued */
        if (ctx->pending == 0)
                complete(&ctx->complete);
-       spin_unlock(&ctx->lock);
+       spin_unlock_irqrestore(&ctx->lock, flags);
 }
 
 static int
@@ -1917,8 +1918,9 @@ struct transfer_context {
 static void complicated_callback(struct urb *urb)
 {
        struct transfer_context *ctx = urb->context;
+       unsigned long flags;
 
-       spin_lock(&ctx->lock);
+       spin_lock_irqsave(&ctx->lock, flags);
        ctx->count--;
 
        ctx->packet_count += urb->number_of_packets;
@@ -1958,7 +1960,7 @@ static void complicated_callback(struct urb *urb)
                complete(&ctx->done);
        }
 done:
-       spin_unlock(&ctx->lock);
+       spin_unlock_irqrestore(&ctx->lock, flags);
 }
 
 static struct urb *iso_alloc_urb(