Commit 8b47d032 authored by Johan Hovold's avatar Johan Hovold Committed by Luis Henriques

USB: serial: fix infinite wait_until_sent timeout

commit f528bf4f upstream.

Make sure to handle an infinite timeout (0).

Note that wait_until_sent is currently never called with a 0-timeout
argument due to a bug in tty_wait_until_sent.

Fixes: dcf01050 ("USB: serial: add generic wait_until_sent
implementation")
Signed-off-by: default avatarJohan Hovold <johan@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: default avatarLuis Henriques <luis.henriques@canonical.com>
parent 232cccf2
......@@ -258,6 +258,7 @@ void usb_serial_generic_wait_until_sent(struct tty_struct *tty, long timeout)
* character or at least one jiffy.
*/
period = max_t(unsigned long, (10 * HZ / bps), 1);
if (timeout)
period = min_t(unsigned long, period, timeout);
dev_dbg(&port->dev, "%s - timeout = %u ms, period = %u ms\n",
......@@ -268,7 +269,7 @@ void usb_serial_generic_wait_until_sent(struct tty_struct *tty, long timeout)
schedule_timeout_interruptible(period);
if (signal_pending(current))
break;
if (time_after(jiffies, expire))
if (timeout && time_after(jiffies, expire))
break;
}
}
......
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