Re: [PATCH 08/50] USB: legousbtower: spin_lock in complete() cleanup

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Hello.

On 11-07-2013 13:05, Ming Lei wrote:

Complete() will be run with interrupt enabled, so change to
spin_lock_irqsave().

Cc: Juergen Stuber <starblue@xxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxxxxx>
---
  drivers/usb/misc/legousbtower.c |    5 +++--
  1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/misc/legousbtower.c b/drivers/usb/misc/legousbtower.c
index 8089479..4044989 100644
--- a/drivers/usb/misc/legousbtower.c
+++ b/drivers/usb/misc/legousbtower.c
@@ -771,6 +771,7 @@ static void tower_interrupt_in_callback (struct urb *urb)
  	struct lego_usb_tower *dev = urb->context;
  	int status = urb->status;
  	int retval;
+	unsigned long flags;

  	dbg(4, "%s: enter, status %d", __func__, status);

@@ -788,7 +789,7 @@ static void tower_interrupt_in_callback (struct urb *urb)
  	}

  	if (urb->actual_length > 0) {
-		spin_lock (&dev->read_buffer_lock);
+		spin_lock_irqsave (&dev->read_buffer_lock, flags);
  		if (dev->read_buffer_length + urb->actual_length < read_buffer_size) {
  			memcpy (dev->read_buffer + dev->read_buffer_length,
  				dev->interrupt_in_buffer,
@@ -799,7 +800,7 @@ static void tower_interrupt_in_callback (struct urb *urb)
  		} else {
  			printk(KERN_WARNING "%s: read_buffer overflow, %d bytes dropped", __func__, urb->actual_length);
  		}
-		spin_unlock (&dev->read_buffer_lock);
+		spin_unlock_irqrestore (&dev->read_buffer_lock, flags);
  	}

   I don't think this patch passes checkpatch.pl.

WBR, Sergei


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