USB: serial: fix assumption that throttle/unthrottle cannot sleep

many serial subdrivers are clearly written as if throttle/unthrottle
cannot sleep. This leads to unneeded atomic submissions. This
patch converts affected drivers in a way to makes very clear that
throttle/unthrottle can sleep. Thus future misdesigns can be avoided
and efficiency and reliability improved.

This removes any such assumption using GFP_KERNEL and spin_lock_irq()

Signed-off-by: Oliver Neukum <oliver@neukum.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/usb/serial/keyspan_pda.c b/drivers/usb/serial/keyspan_pda.c
index 257c16cc6b2a..1296a097f5c3 100644
--- a/drivers/usb/serial/keyspan_pda.c
+++ b/drivers/usb/serial/keyspan_pda.c
@@ -290,7 +290,7 @@ static void keyspan_pda_rx_unthrottle(struct tty_struct *tty)
         /* just restart the receive interrupt URB */
         dbg("keyspan_pda_rx_unthrottle port %d", port->number);
         port->interrupt_in_urb->dev = port->serial->dev;
-        if (usb_submit_urb(port->interrupt_in_urb, GFP_ATOMIC))
+        if (usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL))
                 dbg(" usb_submit_urb(read urb) failed");
         return;
 }