linux-kernel - [PATCH] rts5208: Fix a sleep-in-atomic bug in sd_power_off

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Date:   Thu,  1 Jun 2017 11:49:08 +0800
From:   Jia-Ju Bai <baijiaju1990@....com>
To:     gregkh@...uxfoundation.org, wporter82@...il.com,
        sergio.paracuellos@...il.com, aquannie@...il.com
Cc:     devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        Jia-Ju Bai <baijiaju1990@....com>
Subject: [PATCH] rts5208: Fix a sleep-in-atomic bug in sd_power_off_card3v3

The driver may sleep under a spin lock, and the function call path is:
rtsx_exclusive_enter_ss (acquire the lock by spin_lock)
  rtsx_enter_ss
    rtsx_power_off_card
      sd_power_off_card3v3
        wait_timeout
          schedule_timeout --> may sleep

To fix it, "wait_timeout" is replaced with mdelay in sd_power_off_card3v3.

Signed-off-by: Jia-Ju Bai <baijiaju1990@....com>
---
 drivers/staging/rts5208/sd.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/rts5208/sd.c b/drivers/staging/rts5208/sd.c
index bdd35b6..aa14454 100644
--- a/drivers/staging/rts5208/sd.c
+++ b/drivers/staging/rts5208/sd.c
@@ -5231,7 +5231,7 @@ int sd_power_off_card3v3(struct rtsx_chip *chip)
 			return STATUS_FAIL;
 		}
 
-		wait_timeout(50);
+		mdelay(50);
 	}
 
 	if (chip->asic_code) {
-- 
1.7.9.5