mwifiex: fix system hang issue in cmd timeout error case

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Reported by Tim Shepard:
I was seeing sporadic failures (wedgeups), and the majority of those
failures I saw printed the printouts in mwifiex_cmd_timeout_func with
cmd = 0xe5 which is CMD_802_11_HS_CFG_ENH.  When this happens, two
minutes later I get notified that the rtcwake thread is blocked, like
this:
      INFO: task rtcwake:3495 blocked for more than 120 seconds.

To get the hung thread unblocked we wake up the cmd wait queue and
cancel the ioctl.

Cc: "3.4+" <stable@vger.kernel.org>
Reported-by: Tim Shepard <shep@laptop.org>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

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This commit is contained in:

Bing Zhao 2012-11-15 15:58:47 -08:00 • committed by John W. Linville

parent a485e827f0

commit b1a47aa5e1

1 changed files with 8 additions and 3 deletions

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drivers/net/wireless/mwifiex/cmdevt.c

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