From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S966877AbcIVT1t (ORCPT ); Thu, 22 Sep 2016 15:27:49 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:56231 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934896AbcIVReC (ORCPT ); Thu, 22 Sep 2016 13:34:02 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Lars-Peter Clausen , Jonathan Cameron Subject: [PATCH 4.4 032/118] iio: ad799x: Fix buffered capture for ad7991/ad7995/ad7999 Date: Thu, 22 Sep 2016 19:28:52 +0200 Message-Id: <20160922172940.210542419@linuxfoundation.org> X-Mailer: git-send-email 2.10.0 In-Reply-To: <20160922172938.643879685@linuxfoundation.org> References: <20160922172938.643879685@linuxfoundation.org> User-Agent: quilt/0.64 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Lars-Peter Clausen commit 7d3cc21dab5313a02f2f3ca8164529b828a030d1 upstream. The data buffer for captured mode for the ad799x driver is allocated in the update_scan_mode() callback. This callback is not set in the iio_info struct for the ad7791/ad7995/ad7999, which means that the data buffer is not allocated when a captured transfer is started. As a result the driver crashes when the first sample is received. To fix this properly set the update_scan_mode() callback. Fixes: d8dca33027c1 ("staging:iio:ad799x: Preallocate sample buffer") Signed-off-by: Lars-Peter Clausen Signed-off-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman --- drivers/iio/adc/ad799x.c | 1 + 1 file changed, 1 insertion(+) --- a/drivers/iio/adc/ad799x.c +++ b/drivers/iio/adc/ad799x.c @@ -533,6 +533,7 @@ static struct attribute_group ad799x_eve static const struct iio_info ad7991_info = { .read_raw = &ad799x_read_raw, .driver_module = THIS_MODULE, + .update_scan_mode = ad799x_update_scan_mode, }; static const struct iio_info ad7993_4_7_8_noirq_info = {