From patchwork Tue Jun 21 18:53:04 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 9191257 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id CDA60601C0 for ; Tue, 21 Jun 2016 18:54:59 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id BC5DF2830A for ; Tue, 21 Jun 2016 18:54:59 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B0F092832F; Tue, 21 Jun 2016 18:54:59 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D06D428326 for ; Tue, 21 Jun 2016 18:54:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752081AbcFUSyB (ORCPT ); Tue, 21 Jun 2016 14:54:01 -0400 Received: from mezzanine.sirena.org.uk ([106.187.55.193]:57242 "EHLO mezzanine.sirena.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751466AbcFUSxp (ORCPT ); Tue, 21 Jun 2016 14:53:45 -0400 Received: from debutante.sirena.org.uk ([2a01:348:6:8808:fab::3] helo=debutante) by mezzanine.sirena.org.uk with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.84_2) (envelope-from ) id 1bFQnK-0002Ee-S6; Tue, 21 Jun 2016 18:53:07 +0000 Received: from broonie by debutante with local (Exim 4.87) (envelope-from ) id 1bFQnI-0008VA-12; Tue, 21 Jun 2016 19:53:04 +0100 From: Mark Brown To: Christian Gmeiner Cc: Mark Brown , linux-spi@vger.kernel.org, broonie@kernel.org, linux-kernel@vger.kernel.org In-Reply-To: <1466511174-17048-1-git-send-email-christian.gmeiner@gmail.com> Message-Id: Date: Tue, 21 Jun 2016 19:53:04 +0100 X-SA-Exim-Connect-IP: 2a01:348:6:8808:fab::3 X-SA-Exim-Mail-From: broonie@sirena.org.uk Subject: Applied "spi: imx: wait_for_completion_timeout(..) for PIO transfers" to the spi tree X-SA-Exim-Version: 4.2.1 (built Mon, 26 Dec 2011 16:24:06 +0000) X-SA-Exim-Scanned: Yes (on mezzanine.sirena.org.uk) Sender: linux-spi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The patch spi: imx: wait_for_completion_timeout(..) for PIO transfers has been applied to the spi tree at git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted. You may get further e-mails resulting from automated or manual testing and review of the tree, please engage with people reporting problems and send followup patches addressing any issues that are reported if needed. If any updates are required or you are submitting further changes they should be sent as incremental updates against current git, existing patches will not be replaced. Please add any relevant lists and maintainers to the CCs when replying to this mail. Thanks, Mark From ff1ba3dac08eb10bd096d799430e5d1494f2ddfb Mon Sep 17 00:00:00 2001 From: Christian Gmeiner Date: Tue, 21 Jun 2016 14:12:54 +0200 Subject: [PATCH] spi: imx: wait_for_completion_timeout(..) for PIO transfers In some rare cases I see the following 'task blocked' information. It looks like the PIO transfer has some problems and never succeeds. Make use of wait_for_completion_timeout(..) to detect this case and return -ETIMEDOUT. [ 240.246067] INFO: task hexdump:1660 blocked for more than 120 seconds. [ 240.246089] Not tainted 4.1.17 0000001 [ 240.246099] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 240.246109] hexdump D c0575548 0 1660 1 0x00000000 [ 240.246132] Backtrace: [ 240.246166] [] (__schedule) from [] (schedule+0x40/0xa4) [ 240.246176] r10:00000000 r9:c07f1300 r8:c07b8408 r7:c0576518 r6:7fffffff r5:7fffffff [ 240.246210] r4:ee972e7c [ 240.246233] [] (schedule) from [] (schedule_timeout+0x174/0x274) [ 240.246254] [] (schedule_timeout) from [] (wait_for_common+0xc0/0x164) [ 240.246263] r10:00000000 r9:c07f1300 r8:00000002 r7:00000000 r6:7fffffff r5:ee972e78 [ 240.246294] r4:ee972e7c [ 240.246314] [] (wait_for_common) from [] (wait_for_completion+0x20/0x24) [ 240.246324] r10:ee972e50 r8:00000001 r7:c3976200 r6:ee972c00 r5:ee972e50 r4:c2c87d28 [ 240.246367] [] (wait_for_completion) from [] (spi_imx_transfer+0xe8/0x3cc) [ 240.246393] [] (spi_imx_transfer) from [] (spi_bitbang_transfer_one+0xb4/0x250) [ 240.246403] r10:ee972e50 r8:00000001 r7:00000000 r6:c2c87da0 r5:00000000 r4:c2c87d28 [ 240.246443] [] (spi_bitbang_transfer_one) from [] (__spi_pump_messages+0x36c/0x6b4) [ 240.246452] r10:ee9e5010 r9:00000001 r8:ee9e5010 r7:00000000 r6:c2c87da0 r5:c2c87d6c [ 240.246483] r4:ee972c00 [ 240.246503] [] (__spi_pump_messages) from [] (__spi_sync+0x138/0x1e4) [ 240.246512] r10:00000000 r9:00000000 r8:c03f25a8 r7:00000000 r6:ee972c00 r5:c3976200 [ 240.246542] r4:c2c87da0 [ 240.246562] [] (__spi_sync) from [] (spi_sync+0x1c/0x20) [ 240.246571] r10:00040000 r9:00000000 r8:c3976200 r7:00000000 r6:ee973300 r5:c2c87da0 [ 240.246602] r4:ee973014 [ 240.246623] [] (spi_sync) from [] (m25p80_read+0xf8/0x124) [ 240.246641] [] (m25p80_read) from [] (spi_nor_read+0x64/0x80) [ 240.246651] r10:00004000 r8:00004000 r7:00000000 r6:00040000 r5:00000000 r4:ee973014 [ 240.246698] [] (spi_nor_read) from [] (mtd_read+0x98/0xcc) [ 240.246708] r7:c2c87ea0 r6:ee973098 r5:00000000 r4:001c0000 [ 240.246740] [] (mtd_read) from [] (mtdchar_read+0xcc/0x204) [ 240.246750] r9:ed424000 r8:00000000 r7:b495d018 r6:c2c87f78 r5:00000000 r4:00040000 [ 240.246793] [] (mtdchar_read) from [] (__vfs_read+0x3c/0xe0) [ 240.246803] r10:00004000 r9:00000000 r8:c2c87f78 r7:b495d018 r6:c2c87f78 r5:c05c8104 [ 240.246833] r4:c32fe600 [ 240.246852] [] (__vfs_read) from [] (vfs_read+0x98/0x154) [ 240.246861] r10:00000000 r8:00040000 r7:00004000 r6:c2c87f78 r5:b495d018 r4:c32fe600 [ 240.246899] [] (vfs_read) from [] (SyS_read+0x50/0x90) [ 240.246908] r10:00000000 r8:00040000 r7:b495d018 r6:00004000 r5:c32fe601 r4:c32fe600 [ 240.246953] [] (SyS_read) from [] (ret_fast_syscall+0x0/0x3c) [ 240.246962] r9:c2c86000 r8:c000fc04 r7:00000003 r6:00004000 r5:00000000 r4:b495d018 Signed-off-by: Christian Gmeiner Signed-off-by: Mark Brown --- drivers/spi/spi-imx.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c index cafe42c72435..f63cb30f9010 100644 --- a/drivers/spi/spi-imx.c +++ b/drivers/spi/spi-imx.c @@ -1042,6 +1042,8 @@ static int spi_imx_pio_transfer(struct spi_device *spi, struct spi_transfer *transfer) { struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); + unsigned long transfer_timeout; + unsigned long timeout; spi_imx->tx_buf = transfer->tx_buf; spi_imx->rx_buf = transfer->rx_buf; @@ -1054,7 +1056,15 @@ static int spi_imx_pio_transfer(struct spi_device *spi, spi_imx->devtype_data->intctrl(spi_imx, MXC_INT_TE); - wait_for_completion(&spi_imx->xfer_done); + transfer_timeout = spi_imx_calculate_timeout(spi_imx, transfer->len); + + timeout = wait_for_completion_timeout(&spi_imx->xfer_done, + transfer_timeout); + if (!timeout) { + dev_err(&spi->dev, "I/O Error in PIO\n"); + spi_imx->devtype_data->reset(spi_imx); + return -ETIMEDOUT; + } return transfer->len; }