linux-kernel - [PATCH] esas2r: Fix a possible sleep-in-atomic bug in esas2r_flash

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Date:   Tue, 12 Dec 2017 16:24:33 +0800
From:   Jia-Ju Bai <baijiaju1990@....com>
To:     linuxdrivers@...otech.com, jejb@...ux.vnet.ibm.com,
        martin.petersen@...cle.com
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jia-Ju Bai <baijiaju1990@....com>
Subject: [PATCH] esas2r: Fix a possible sleep-in-atomic bug in esas2r_flash_access

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
          esas2r_read_flash_block
            esas2r_flash_access
              schedule_timeout_interruptible --> may sleep

To fix it, schedule_timeout_uninterruptible is replaced with mdelay.

This bug is found by my static analysis tool(DSAC) and checked by my code review.

Signed-off-by: Jia-Ju Bai <baijiaju1990@....com>
---
 drivers/scsi/esas2r/esas2r_flash.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/esas2r/esas2r_flash.c b/drivers/scsi/esas2r/esas2r_flash.c
index 7bd376d..9b3da4c 100644
--- a/drivers/scsi/esas2r/esas2r_flash.c
+++ b/drivers/scsi/esas2r/esas2r_flash.c
@@ -965,7 +965,7 @@ static bool esas2r_flash_access(struct esas2r_adapter *a, u32 function)
 				break;
 		}
 
-		schedule_timeout_interruptible(msecs_to_jiffies(100));
+		mdelay(100);
 
 		if ((jiffies_to_msecs(jiffies) - starttime) > timeout) {
 			/*
-- 
1.7.9.5