linux-kernel - [BUG] drivers/scsi/wd719x: a possible sleep-in-atomic bug in wd719x_host

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Message-ID: <515a0c3b-044f-7d83-1506-18c77e3c05e6@gmail.com>
Date:   Tue, 12 Dec 2017 11:11:14 +0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     jejb@...ux.vnet.ibm.com, martin.petersen@...cle.com,
        Juergen.Gaertner@...x.si.uni-hannover.de, dewell@...ds.net
Cc:     linux-scsi@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [BUG] drivers/scsi/wd719x: a possible sleep-in-atomic bug in
 wd719x_host_reset

According to drivers/scsi/wd719x.c, the kernel module may sleep under a 
spinlock.
The function call path is:
wd719x_host_reset (acquire the spinlock)
   wd719x_chip_init
     request_firmware --> may sleep

I do not find a good way to fix it, so I only report.
This possible bug is found by my static analysis tool (DSAC) and checked 
by my code review.


Thanks,
Jia-Ju Bai