linux-kernel - [PATCH 4.9 046/130] NFC: pn533: Fix wrong GFP flag usage

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Message-Id: <20180823074930.215709075@linuxfoundation.org>
Date:   Thu, 23 Aug 2018 09:52:42 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Michael Thalmeier <michael.thalmeier@...e.at>,
        Hans de Goede <hdegoede@...hat.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.9 046/130] NFC: pn533: Fix wrong GFP flag usage

4.9-stable review patch.  If anyone has any objections, please let me know.

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

From: Hans de Goede <hdegoede@...hat.com>

[ Upstream commit ecc443c03fb14abfb8a6af5e3b2d43b5257e60f2 ]

pn533_recv_response() is an urb completion handler, so it must use
GFP_ATOMIC. pn533_usb_send_frame() OTOH runs from a regular sleeping
context, so the pn533_submit_urb_for_response() there (and only there)
can use the regular GFP_KERNEL flags.

BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1514134
Fixes: 9815c7cf22da ("NFC: pn533: Separate physical layer from ...")
Cc: Michael Thalmeier <michael.thalmeier@...e.at>
Signed-off-by: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/nfc/pn533/usb.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/nfc/pn533/usb.c
+++ b/drivers/nfc/pn533/usb.c
@@ -71,7 +71,7 @@ static void pn533_recv_response(struct u
 	struct sk_buff *skb = NULL;
 
 	if (!urb->status) {
-		skb = alloc_skb(urb->actual_length, GFP_KERNEL);
+		skb = alloc_skb(urb->actual_length, GFP_ATOMIC);
 		if (!skb) {
 			nfc_err(&phy->udev->dev, "failed to alloc memory\n");
 		} else {
@@ -180,7 +180,7 @@ static int pn533_usb_send_frame(struct p
 
 	if (dev->protocol_type == PN533_PROTO_REQ_RESP) {
 		/* request for response for sent packet directly */
-		rc = pn533_submit_urb_for_response(phy, GFP_ATOMIC);
+		rc = pn533_submit_urb_for_response(phy, GFP_KERNEL);
 		if (rc)
 			goto error;
 	} else if (dev->protocol_type == PN533_PROTO_REQ_ACK_RESP) {