netdev - RE: [EXT] [BUG] net: wireless: mwifiex: A possible sleep-in-atomic-context bug in mwifiex_wait_queue

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Message-ID: <5fbe17917c344f318c25a688f2e94823@SC-EXCH02.marvell.com>
Date:   Mon, 3 Sep 2018 06:41:50 +0000
From:   Ganapathi Bhat <gbhat@...vell.com>
To:     Jia-Ju Bai <baijiaju1990@...il.com>,
        "amitkarwar@...il.com" <amitkarwar@...il.com>,
        "nishants@...vell.com" <nishants@...vell.com>,
        "huxinming820@...il.com" <huxinming820@...il.com>,
        "kvalo@...eaurora.org" <kvalo@...eaurora.org>
CC:     "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: RE: [EXT] [BUG] net: wireless: mwifiex: A possible
 sleep-in-atomic-context bug in mwifiex_wait_queue_complete()

Hi Jia-Ju,

>
> [FUNC] schedule_timeout
> drivers/net/wireless/marvell/mwifiex/sta_ioctl.c, 63:
>      schedule_timeout in mwifiex_wait_queue_complete
> drivers/net/wireless/marvell/mwifiex/cmdevt.c, 673:
>      mwifiex_wait_queue_complete in mwifiex_send_cmd
Here, mwifiex_send_cmd does not call mwifiex_wait_queue_complete, because the sync parameter is false.
Note that the function mwifiex_multi_chan_resync did call mwifiex_send_cmd with sync = false.
> drivers/net/wireless/marvell/mwifiex/main.c, 1046:
>      mwifiex_send_cmd in mwifiex_multi_chan_resync
> drivers/net/wireless/marvell/mwifiex/usb.c, 288:
>      mwifiex_multi_chan_resync in mwifiex_usb_tx_complete
>
Thanks,
Ganapathi