linux-kernel - [PATCH 2/2] USB: mos7840: fix non-atomic allocation in write path

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Date:	Fri, 12 Aug 2016 01:05:09 +0300
From:	Alexey Khoroshilov <khoroshilov@...ras.ru>
To:	Johan Hovold <johan@...nel.org>
Cc:	Alexey Khoroshilov <khoroshilov@...ras.ru>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	ldv-project@...uxtesting.org
Subject: [PATCH 2/2] USB: mos7840: fix non-atomic allocation in write path

There is an allocation with GFP_KERNEL flag in mos7840_write(),
while it may be called from interrupt context.

Follow-up for commit 191252837626 ("USB: kobil_sct: fix non-atomic allocation in write path")

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
---
 drivers/usb/serial/mos7840.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/serial/mos7840.c b/drivers/usb/serial/mos7840.c
index ed378fb232e7..1de2c01c078d 100644
--- a/drivers/usb/serial/mos7840.c
+++ b/drivers/usb/serial/mos7840.c
@@ -1341,7 +1341,7 @@ static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
 
 	if (urb->transfer_buffer == NULL) {
 		urb->transfer_buffer =
-		    kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
+		    kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_ATOMIC);
 		if (!urb->transfer_buffer)
 			goto exit;
 	}
-- 
1.9.1