From: Vipin Mehta Date: Fri, 17 Sep 2010 16:55:15 +0000 (-0700) Subject: staging: ath6kl: Fixing a race condition during initialization X-Git-Tag: v2.6.37-rc1~60^2~3^2~538 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=9b906a33e0a459ea4d51c8d243154c6998be2a1d;p=karo-tx-linux.git 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 Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/staging/ath6kl/os/linux/ar6000_drv.c b/drivers/staging/ath6kl/os/linux/ar6000_drv.c index c7922c9ff233..daba6e4cb9d8 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