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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 <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Sujith 2010-04-23 10:28:19 +05:30 committed by John W. Linville
parent ba44370175
commit 0d36d71da2
1 changed files with 4 additions and 4 deletions
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8
drivers/net/wireless/ath/ath9k/wmi.c
View File

@ -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,