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

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Date:   Thu,  1 Jun 2017 11:43:35 +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 rtsx_exclusive_enter_ss

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_change_phase
                  wait_timeout
                    schedule_timeout --> may sleep

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

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..76bd105 100644
--- a/drivers/staging/rts5208/sd.c
+++ b/drivers/staging/rts5208/sd.c
@@ -1057,7 +1057,7 @@ static int sd_change_phase(struct rtsx_chip *chip, u8 sample_point, u8 tune_dir)
 
 	rtsx_write_register(chip, SD_DCMPS_CTL, DCMPS_CHANGE, 0);
 	rtsx_write_register(chip, SD_VP_CTL, PHASE_CHANGE, 0);
-	wait_timeout(10);
+	mdelay(10);
 	sd_reset_dcm(chip, tune_dir);
 	return STATUS_FAIL;
 }
-- 
1.7.9.5