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Bluetooth: hci_ath: Replace mdelay with msleep in ath_wakeup_ar3k 

ath_wakeup_ar3k() is never called from atomic context.

It is only called by ath_hci_uart_work() that is only called in
ath_open() via INIT_WORK().
All of the above functions do not enter atomic context along the way.

Despite never getting called from atomic context, ath_wakeup_ar3k() calls
mdelay() for busy wait.
That is not necessary and can be replaced with msleep to avoid busy wait.

This is found by a static analysis tool named DCNS written by myself.

Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Jia-Ju Bai 2018-01-27 18:17:38 +08:00 committed by Marcel Holtmann
parent 0a21963aac
commit 688d6240e0
1 changed files with 2 additions and 2 deletions
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4
drivers/bluetooth/hci_ath.c
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@ -71,12 +71,12 @@ static int ath_wakeup_ar3k(struct tty_struct *tty)
/* Clear RTS first */
tty->driver->ops->tiocmget(tty);
tty->driver->ops->tiocmset(tty, 0x00, TIOCM_RTS);
mdelay(20);
msleep(20);
/* Set RTS, wake up board */
tty->driver->ops->tiocmget(tty);
tty->driver->ops->tiocmset(tty, TIOCM_RTS, 0x00);
mdelay(20);
msleep(20);
status = tty->driver->ops->tiocmget(tty);
return status;