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

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Date:   Tue, 13 Jun 2017 19:18:32 +0800
From:   Jia-Ju Bai <baijiaju1990@....com>
To:     Greg KH <gregkh@...uxfoundation.org>, wporter82@...il.com,
        sergio.paracuellos@...il.com, aquannie@...il.com
CC:     devel@...verdev.osuosl.org, LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] rts5208: Fix a sleep-in-atomic bug in sd_send_cmd_get_rsp

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_cleanup_work
         sd_stop_seq_mode
           sd_switch_clock
             sd_ddr_tuning
               sd_ddr_pre_tuning_tx
                 sd_send_cmd_get_rsp
                   wait_timeout
                     schedule_timeout -->  may sleep

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

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..fed17ff 100644
--- a/drivers/staging/rts5208/sd.c
+++ b/drivers/staging/rts5208/sd.c
@@ -226,7 +226,7 @@ static int sd_send_cmd_get_rsp(struct rtsx_chip *chip, u8 cmd_idx,
  				return STATUS_FAIL;
  			}
  			if (rty_cnt<  SD_MAX_RETRY_COUNT) {
-				wait_timeout(20);
+				mdelay(20);
  				rty_cnt++;
  				goto RTY_SEND_CMD;
  			} else {
-- 1.7.9.5