USB: serial: fix write memory-allocation flag

Fix regression introduced by commit 818f60365a29 ("USB: serial: add
memory flags to usb_serial_generic_write_start"), which incorrectly used
GFP_KERNEL in write(), which must not not sleep.

Reported-by: Dave Jones <davej@fedoraproject.org>
Tested-by: Dave Jones <davej@fedoraproject.org>
Cc: Dave Jones <davej@fedoraproject.org>
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c
index e36b25a..b63ce02 100644 (file)
--- a/drivers/usb/serial/generic.c
+++ b/drivers/usb/serial/generic.c
@@ -200,7 +200,7 @@ int usb_serial_generic_write(struct tty_struct *tty,
                return 0;
 
        count = kfifo_in_locked(&port->write_fifo, buf, count, &port->lock);
-       result = usb_serial_generic_write_start(port, GFP_KERNEL);
+       result = usb_serial_generic_write_start(port, GFP_ATOMIC);
        if (result)
                return result;