diff mbox

[4/17] drivers/isdn/hardware/mISDN: Add missing spin_unlock

Message ID Pine.LNX.4.64.1005261754560.23743@ask.diku.dk
State Accepted, archived
Delegated to: David Miller
Headers show

Commit Message

Julia Lawall May 26, 2010, 3:55 p.m. UTC 
From: Julia Lawall <julia@diku.dk>

Add a spin_unlock missing on the error path.  The return value of write_reg
seems to be completely ignored, so it seems that the lock should be
released in every case.

The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression E1;
@@

* spin_lock(E1,...);
  <+... when != E1
  if (...) {
    ... when != E1
*   return ...;
  }
  ...+>
* spin_unlock(E1,...);
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>

---
 drivers/isdn/hardware/mISDN/hfcsusb.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

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Comments

David Miller May 29, 2010, 7:19 a.m. UTC | #1 
From: Julia Lawall <julia@diku.dk>
Date: Wed, 26 May 2010 17:55:10 +0200 (CEST)

> From: Julia Lawall <julia@diku.dk>
> 
> Add a spin_unlock missing on the error path.  The return value of write_reg
> seems to be completely ignored, so it seems that the lock should be
> released in every case.
> 
> The semantic match that finds this problem is as follows:
> (http://coccinelle.lip6.fr/)
 ...
> Signed-off-by: Julia Lawall <julia@diku.dk>

Applied, thanks.
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diff mbox

Patch

diff --git a/drivers/isdn/hardware/mISDN/hfcsusb.c b/drivers/isdn/hardware/mISDN/hfcsusb.c
index b3b7e28..8700474 100644
--- a/drivers/isdn/hardware/mISDN/hfcsusb.c
+++ b/drivers/isdn/hardware/mISDN/hfcsusb.c
@@ -97,8 +97,10 @@  static int write_reg(struct hfcsusb *hw, __u8 reg, __u8 val)
 			hw->name, __func__, reg, val);
 
 	spin_lock(&hw->ctrl_lock);
-	if (hw->ctrl_cnt >= HFC_CTRL_BUFSIZE)
+	if (hw->ctrl_cnt >= HFC_CTRL_BUFSIZE) {
+		spin_unlock(&hw->ctrl_lock);
 		return 1;
+	}
 	buf = &hw->ctrl_buff[hw->ctrl_in_idx];
 	buf->hfcs_reg = reg;
 	buf->reg_val = val;