linux-kernel - [BUG] drivers/scsi/esas2r: a possible sleep-in-atomic bug in esas2r_nvram_read

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Date:   Tue, 12 Dec 2017 16:15:12 +0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     linuxdrivers@...otech.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/esas2r: a possible sleep-in-atomic bug in
 esas2r_nvram_read_direct

The driver may sleep in the interrupt handler.
The function call path is:
esas2r_adapter_tasklet (interrupt handler)
   esas2r_do_tasklet_tasks
     esas2r_handle_chip_rst_during_tasklet
       esas2r_init_adapter_hw
         esas2r_nvram_read_direct
           down_interruptible --> 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