linux-kernel - [BUG] drivers/scsi/advansys: three possible sleep-in-atomic bugs in advansys

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Date:   Tue, 12 Dec 2017 09:44:01 +0800
From:   Jia-Ju Bai <baijiaju1990@....com>
To:     matthew@....cx, hare@...e.com, jejb@...ux.vnet.ibm.com,
        martin.petersen@...cle.com
Cc:     linux-scsi@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [BUG] drivers/scsi/advansys: three possible sleep-in-atomic bugs in
 advansys_interrupt

According to drivers/scsi/advansys.c, the kernel module may sleep in the 
interrupt handler.
The function call paths are:
advansys_interrupt (interrupt handler)
   AdvISR
     adv_async_callback
       AdvResetChipAndSB
         AdvInitAsc38C1600Driver
           request_firmware --> may sleep
         AdvInitAsc38C0800Driver
           request_firmware --> may sleep
         AdvInitAsc3550Driver
           request_firmware --> may sleep

I do not find a good way to fix them, so I only report.
These possible bugs are found by my static analysis tool (DSAC) and 
checked by my code review.


Thanks,
Jia-Ju Bai