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Date:	Sun, 21 Oct 2012 12:52:04 +0200
From:	Julia Lawall <>
To:	Luciano Coelho <>
	"John W. Linville" <>,,,
Subject: [PATCH 2/5] drivers/net/wireless/ti/wlcore/main.c: eliminate possible double power off

From: Julia Lawall <>

The function wl12xx_set_power_on is only called twice, once in
wl12xx_chip_wakeup and once in wl12xx_get_hw_info.  On the failure of the
call in wl12xx_chip_wakeup, the containing function just returns, but on
the failure of the call in wl12xx_get_hw_info, the containing function
calls wl1271_power_off.  This does not seem necessary, because if
wl12xx_set_power_on has set the power on and then fails, it has already
turned the power off.

A simplified version of the semantic match that finds this problem is as
follows: (

// <smpl>
identifier f,free,a;
parameter list[n] ps;
type T;
expression e;

f(ps,T a,...) {
  ... when any
      when != a = e
  if(...) { ... free(a); ... return ...; }
  ... when any

identifier r.f,;
expression x,a;
expression list[r.n] xs;

* x = f(xs,a,...);
  if (...) { ... free(a); ... return ...; }
// </smpl>

Signed-off-by: Julia Lawall <>

wl1271_power_off seems to be resistent to being called when the power is
not on, so this should not change the behavior.  Not tested.

 drivers/net/wireless/ti/wlcore/main.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ti/wlcore/main.c b/drivers/net/wireless/ti/wlcore/main.c
index 25530c8..0eb739b 100644
--- a/drivers/net/wireless/ti/wlcore/main.c
+++ b/drivers/net/wireless/ti/wlcore/main.c
@@ -5116,7 +5116,7 @@ static int wl12xx_get_hw_info(struct wl1271 *wl)
 	ret = wl12xx_set_power_on(wl);
 	if (ret < 0)
-		goto out;
+		return ret;
 	ret = wlcore_read_reg(wl, REG_CHIP_ID_B, &wl->;
 	if (ret < 0)

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