linux-kernel - [BUG] drivers/scsi/dpt_i2o: a possible sleep-in-atomic bug in adpt

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Date:   Tue, 12 Dec 2017 09:57:48 +0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     aacraid@...ptec.com, jejb@...ux.vnet.ibm.com,
        martin.petersen@...cle.com
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [BUG] drivers/scsi/dpt_i2o: a possible sleep-in-atomic bug in
 adpt_isr

According to drivers/scsi/dpt_i2o.c, the kernel module may sleep in the 
interrupt handler.
The function call path is:
adpt_isr (interrupt handler)
   adpt_send_nop
     schedule_timeout_uninterruptible --> may sleep

A possible fixing is to replace "schedule_timeout_uninterruptible" with 
"mdelay".
If this fixing is correct, I can send a patch.
This possible is found by my static analysis tool (DSAC) and checked by 
my code review.


Thanks,
Jia-Ju Bai