From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jason Hrycay , Bryan ODonoghue , Johan Hovold , Sasha Levin Subject: [PATCH 4.9 50/72] staging: greybus: add host device function pointer checks Date: Sun, 19 Nov 2017 15:38:54 +0100 Message-Id: <20171119143534.428615228@linuxfoundation.org> In-Reply-To: <20171119143532.376035495@linuxfoundation.org> References: <20171119143532.376035495@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jason Hrycay [ Upstream commit f05a88a39c5b5f226e08e626998bb920723b7d85 ] Add sanity checks for cport_quiesce and cport_clear before invoking the callbacks as these function pointers are not required during the host device registration. This follows the logic implemented elsewhere for various other function pointers. Signed-off-by: Jason Hrycay Reviewed-by: Bryan O'Donoghue Acked-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/staging/greybus/connection.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/drivers/staging/greybus/connection.c +++ b/drivers/staging/greybus/connection.c @@ -357,6 +357,9 @@ static int gb_connection_hd_cport_quiesc size_t peer_space; int ret; + if (!hd->driver->cport_quiesce) + return 0; + peer_space = sizeof(struct gb_operation_msg_hdr) + sizeof(struct gb_cport_shutdown_request); @@ -380,6 +383,9 @@ static int gb_connection_hd_cport_clear( struct gb_host_device *hd = connection->hd; int ret; + if (!hd->driver->cport_clear) + return 0; + ret = hd->driver->cport_clear(hd, connection->hd_cport_id); if (ret) { dev_err(&hd->dev, "%s: failed to clear host cport: %d\n",