linux-kernel - [PATCH 3.2 106/164] USB: kobil_sct: fix non-atomic allocation in write path

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Date:	Fri, 12 Dec 2014 06:14:25 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Johan Hovold" <johan@...nel.org>
Subject: [PATCH 3.2 106/164] USB: kobil_sct: fix non-atomic allocation in
 write path

3.2.65-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Johan Hovold <johan@...nel.org>

commit 191252837626fca0de694c18bb2aa64c118eda89 upstream.

Write may be called from interrupt context so make sure to use
GFP_ATOMIC for all allocations in write.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Johan Hovold <johan@...nel.org>
[bwh: Backported to 3.2:
 - s/interrupt_out_urb/write_urb/
 - Adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/usb/serial/kobil_sct.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/usb/serial/kobil_sct.c
+++ b/drivers/usb/serial/kobil_sct.c
@@ -463,7 +463,8 @@ static int kobil_write(struct tty_struct
 			);
 
 			priv->cur_pos = priv->cur_pos + length;
-			result = usb_submit_urb(port->write_urb, GFP_NOIO);
+			result = usb_submit_urb(port->write_urb,
+					GFP_ATOMIC);
 			dbg("%s - port %d Send write URB returns: %i",
 					__func__, port->number, result);
 			todo = priv->filled - priv->cur_pos;
@@ -487,7 +488,7 @@ static int kobil_write(struct tty_struct
 			port->interrupt_in_urb->dev = port->serial->dev;
 
 			result = usb_submit_urb(port->interrupt_in_urb,
-								GFP_NOIO);
+					GFP_ATOMIC);
 			dbg("%s - port %d Send read URB returns: %i",
 					__func__, port->number, result);
 		}

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