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wl12xx: Fix validation of pm_runtime_get_sync return value 

wl1271_sdio_power_on checks if the return value of pm_runtime_get_sync
is non-zero, and if so bails out.
However, pm_runtime_get_sync can return a positive number which does not
suggest an error has occurred. This is problematic for two reasons:

1. The function will needlessly bail out without decrementing back the
   runtime PM reference counter.
2. wl1271_power_on only checks if wl1271_power_on return value is
   negative. This means that wl1271_power_on will continue even if
   wl1271_sdio_power_on bailed out. As a result, sdio transactions will
   be initiated without properly enabling the sdio function and claiming
   the host. This could even lead to a kernel panic.

Fix this by only checking that the return value of pm_runtime_get_sync
is non-negative.

Signed-off-by: Ido Yariv <ido@wizery.com>
Acked-by: Luciano Coelho <coelho@ti.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Ido Yariv 2011-08-22 23:19:49 +03:00 committed by John W. Linville
parent 80900d0140
commit a15f1c45f3
1 changed files with 1 additions and 1 deletions
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2
drivers/net/wireless/wl12xx/sdio.c
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@ -164,7 +164,7 @@ static int wl1271_sdio_power_on(struct wl1271 *wl)
/* If enabled, tell runtime PM not to power off the card */
if (pm_runtime_enabled(&func->dev)) {
ret = pm_runtime_get_sync(&func->dev);
if (ret)
if (ret < 0)
goto out;
} else {
/* Runtime PM is disabled: power up the card manually */