From 0d36d71da2a3e5b28b4e7743c0041515cca798ef Mon Sep 17 00:00:00 2001 From: Sujith Date: Fri, 23 Apr 2010 10:28:19 +0530 Subject: [PATCH] ath9k_htc: Fix WMI command race My patch "ath9k_htc: Handle WMI timeouts properly" introduced a race condition in WMI command processing. The last issued command should be stored _before_ issuing a WMI command. Not doing this would result in the WMI event IRQ dropping correct command responses as invalid. Fix this race by storing the command id correctly. Signed-off-by: Sujith Signed-off-by: John W. Linville --- drivers/net/wireless/ath/ath9k/wmi.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/net/wireless/ath/ath9k/wmi.c b/drivers/net/wireless/ath/ath9k/wmi.c index c688545..e23172c 100644 --- a/drivers/net/wireless/ath/ath9k/wmi.c +++ b/drivers/net/wireless/ath/ath9k/wmi.c @@ -305,14 +305,14 @@ int ath9k_wmi_cmd(struct wmi *wmi, enum wmi_cmd_id cmd_id, wmi->cmd_rsp_buf = rsp_buf; wmi->cmd_rsp_len = rsp_len; - ret = ath9k_wmi_cmd_issue(wmi, skb, cmd_id, cmd_len); - if (ret) - goto out; - spin_lock_irqsave(&wmi->wmi_lock, flags); wmi->last_cmd_id = cmd_id; spin_unlock_irqrestore(&wmi->wmi_lock, flags); + ret = ath9k_wmi_cmd_issue(wmi, skb, cmd_id, cmd_len); + if (ret) + goto out; + time_left = wait_for_completion_timeout(&wmi->cmd_wait, timeout); if (!time_left) { ath_print(common, ATH_DBG_WMI, -- 2.7.4