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authorSebastian Andrzej Siewior <bigeasy@linutronix.de>2018-07-01 17:35:44 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-07-06 16:36:19 +0200
commit6f3fde684d0232e66ada3410f016a58e09a87689 (patch)
treed87ab4aafc6496c0b7d8ebdf937dec79fa9a8e3b
parent399111aaa7b9b4a2f7f20d38943ab55b6a67653e (diff)
downloadlinux-6f3fde684d0232e66ada3410f016a58e09a87689.tar.bz2
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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/usb/misc/usbtest.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/usb/misc/usbtest.c b/drivers/usb/misc/usbtest.c
index 9e1142b8b91b..c7f82310e73e 100644
--- 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(