diff options
| author | Vipin Mehta <vmehta@atheros.com> | 2010-09-17 09:55:15 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-09-20 17:02:02 -0700 |
| commit | 9b906a33e0a459ea4d51c8d243154c6998be2a1d (patch) | |
| tree | b65c3139397cb74da1f0858d7c28c48b3a0bcc01 | |
| parent | 103281df0b7fec07872ef033666a1707b5755b9c (diff) | |
| download | op-kernel-dev-9b906a33e0a459ea4d51c8d243154c6998be2a1d.zip op-kernel-dev-9b906a33e0a459ea4d51c8d243154c6998be2a1d.tar.gz | |
staging: ath6kl: Fixing a race condition during initialization
The commit fixes a race condition in the initialization portion of the
driver. The problem was observed while testing with the kernel in the
staging-next tree. The wait on the ready event is signalled prematurely
before setting the arVersion.wlan_ver and arVersion.abi_ver. The code
waiting on this semaphore checks for the validity of these values and
hence may proceed with an un-updated values of these fields. The wakeup
signal is now sent after these values are set.
Signed-off-by: Vipin Mehta <vmehta@atheros.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/staging/ath6kl/os/linux/ar6000_drv.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/staging/ath6kl/os/linux/ar6000_drv.c b/drivers/staging/ath6kl/os/linux/ar6000_drv.c index c7922c9..daba6e4 100644 --- a/drivers/staging/ath6kl/os/linux/ar6000_drv.c +++ b/drivers/staging/ath6kl/os/linux/ar6000_drv.c @@ -4170,8 +4170,6 @@ ar6000_ready_event(void *devt, A_UINT8 *datap, A_UINT8 phyCap, A_UINT32 sw_ver, AR_SOFTC_T *ar = (AR_SOFTC_T *)devt; struct net_device *dev = ar->arNetDev; - ar->arWmiReady = TRUE; - wake_up(&arEvent); A_MEMCPY(dev->dev_addr, datap, AR6000_ETH_ADDR_LEN); AR_DEBUG_PRINTF(ATH_DEBUG_INFO,("mac address = %2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x\n", dev->dev_addr[0], dev->dev_addr[1], @@ -4182,6 +4180,10 @@ ar6000_ready_event(void *devt, A_UINT8 *datap, A_UINT8 phyCap, A_UINT32 sw_ver, ar->arVersion.wlan_ver = sw_ver; ar->arVersion.abi_ver = abi_ver; + /* Indicate to the waiting thread that the ready event was received */ + ar->arWmiReady = TRUE; + wake_up(&arEvent); + #if WLAN_CONFIG_IGNORE_POWER_SAVE_FAIL_EVENT_DURING_SCAN wmi_pmparams_cmd(ar->arWmi, 0, 1, 0, 0, 1, IGNORE_POWER_SAVE_FAIL_EVENT_DURING_SCAN); #endif |
