]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/commit
wl12xx: Fix validation of pm_runtime_get_sync return value
authorIdo Yariv <ido@wizery.com>
Mon, 22 Aug 2011 20:19:49 +0000 (23:19 +0300)
committerJohn W. Linville <linville@tuxdriver.com>
Tue, 23 Aug 2011 19:54:20 +0000 (15:54 -0400)
commita15f1c45f393982196c981a8df8b534cc9f3bb80
tree17ba9fc6d943fb95f933673bdb5f206f7b858284
parent80900d0140a7648587982c8f299830e900e49165
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>
drivers/net/wireless/wl12xx/sdio.c