Bluetooth: Fix a possible sleep-in-atomic bug in bluecard_write_wakeup

The driver may sleep in the interrupt handler.
The function call path is:
bluecard_interrupt (interrupt handler)
  bluecard_write_wakeup
    schedule_timeout --> may sleep

To fix it, schedule_timeout 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@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 2 insertions, 6 deletions

diff --git a/drivers/bluetooth/bluecard_cs.c b/drivers/bluetooth/bluecard_cs.c
index d513ef4743dc..82437a69f99c 100644
--- a/drivers/bluetooth/bluecard_cs.c
+++ b/drivers/bluetooth/bluecard_cs.c
@@ -302,9 +302,7 @@ static void bluecard_write_wakeup(struct bluecard_info *info)
                         }
 
                         /* Wait until the command reaches the baseband */
-                        prepare_to_wait(&wq, &wait, TASK_INTERRUPTIBLE);
-                        schedule_timeout(HZ/10);
-                        finish_wait(&wq, &wait);
+                        mdelay(100);
 
                         /* Set baud on baseband */
                         info->ctrl_reg &= ~0x03;
@@ -316,9 +314,7 @@ static void bluecard_write_wakeup(struct bluecard_info *info)
                         outb(info->ctrl_reg, iobase + REG_CONTROL);
 
                         /* Wait before the next HCI packet can be send */
-                        prepare_to_wait(&wq, &wait, TASK_INTERRUPTIBLE);
-                        schedule_timeout(HZ);
-                        finish_wait(&wq, &wait);
+                        mdelay(1000);
                 }
 
                 if (len == skb->len) {