[PATCH 4.9 08/70] staging: rt5208: Fix a sleep-in-atomic bug in xd_copy_page

Greg Kroah-Hartman
2018-09-17T22:53:45Z

From: Jia-Ju Bai <baijiaju1990@163.com>

commit 498c4b4e9c23855d17ecc2a108d949bb68020481 upstream.

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
xd_cleanup_work
xd_delay_write
xd_finish_write
xd_copy_page
wait_timeout
schedule_timeout --> may sleep

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

Signed-off-by: Jia-Ju Bai <baijiaju1990@163.com>
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/staging/rts5208/xd.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/staging/rts5208/xd.c
+++ b/drivers/staging/rts5208/xd.c
@@ -1247,7 +1247,7 @@ static int xd_copy_page(struct rtsx_chip
reg = 0;
rtsx_read_register(chip, XD_CTL, &reg);
if (reg & (XD_ECC1_ERROR | XD_ECC2_ERROR)) {
- wait_timeout(100);
+ mdelay(100);

if (detect_card_cd(chip,
XD_CARD) != STATUS_SUCCESS) {