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| author | Ido Yariv <ido@wizery.com> | 2011-08-22 23:19:49 +0300 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2011-08-23 15:54:20 -0400 |
| commit | a15f1c45f393982196c981a8df8b534cc9f3bb80 (patch) | |
| tree | 17ba9fc6d943fb95f933673bdb5f206f7b858284 /drivers/net/wireless/wl12xx | |
| parent | 80900d0140a7648587982c8f299830e900e49165 (diff) | |
| download | blackbird-op-linux-a15f1c45f393982196c981a8df8b534cc9f3bb80.tar.gz blackbird-op-linux-a15f1c45f393982196c981a8df8b534cc9f3bb80.zip | |
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>
Diffstat (limited to 'drivers/net/wireless/wl12xx')
| -rw-r--r-- | drivers/net/wireless/wl12xx/sdio.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/wireless/wl12xx/sdio.c b/drivers/net/wireless/wl12xx/sdio.c index 5cf18c2c23f0..fb1fd5af75ea 100644 --- a/drivers/net/wireless/wl12xx/sdio.c +++ b/drivers/net/wireless/wl12xx/sdio.c @@ -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 */ |
