From patchwork Fri Mar 17 08:42:30 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= X-Patchwork-Id: 664699 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3DD78C76196 for ; Fri, 17 Mar 2023 08:44:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231727AbjCQIoJ (ORCPT ); Fri, 17 Mar 2023 04:44:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35016 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231612AbjCQInx (ORCPT ); Fri, 17 Mar 2023 04:43:53 -0400 Received: from metis.ext.pengutronix.de (metis.ext.pengutronix.de [IPv6:2001:67c:670:201:290:27ff:fe1d:cc33]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B62526905A for ; Fri, 17 Mar 2023 01:42:47 -0700 (PDT) Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1pd5fc-0004tL-Oc; Fri, 17 Mar 2023 09:42:40 +0100 Received: from [2a0a:edc0:0:900:1d::77] (helo=ptz.office.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtp (Exim 4.94.2) (envelope-from ) id 1pd5fb-004jZU-TX; Fri, 17 Mar 2023 09:42:39 +0100 Received: from ukl by ptz.office.stw.pengutronix.de with local (Exim 4.94.2) (envelope-from ) id 1pd5fb-005ZuI-6X; Fri, 17 Mar 2023 09:42:39 +0100 From: =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= To: Mark Brown , Nicolas Ferre , Alexandre Belloni , Claudiu Beznea Cc: linux-spi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kernel@pengutronix.de Subject: [PATCH 1/3] spi: atmel-quadspi: Don't leak clk enable count in pm resume Date: Fri, 17 Mar 2023 09:42:30 +0100 Message-Id: <20230317084232.142257-2-u.kleine-koenig@pengutronix.de> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230317084232.142257-1-u.kleine-koenig@pengutronix.de> References: <20230317084232.142257-1-u.kleine-koenig@pengutronix.de> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=992; i=u.kleine-koenig@pengutronix.de; h=from:subject; bh=FFnOWZjupFGGLc/xMfIraPd8mMgiKbUHssyndztqfKg=; b=owEBbQGS/pANAwAKAcH8FHityuwJAcsmYgBkFCfp1VrKULqQRBRNVs37gyiSigy7MyCHRqxVA +XdGBJT9DGJATMEAAEKAB0WIQR+cioWkBis/z50pAvB/BR4rcrsCQUCZBQn6QAKCRDB/BR4rcrs CVpQB/9lQWaWk1gE3UPzUT5ZhnMpKRrOVYQiaHgMcD+txbwK2+vwpGVhaqUIQcYK/Iq3CTaEifC TwLL9Lx6Qqx8EiHP9OPDDlrhsWHZzE9OyGzx6fqS+bBsWrFc4YcweKuGmM43WCcHMr64fFGVFy5 zGO49aZip2ujh39U39qw7j+emmGHpsQqUFUBwf9m+IatCoYPHRthWKnQDx4+7SW5kcBKXZqbBQ/ 5XTgR0drFmeFB4cyZk8I+PnWotn7IO+sdc9cNsiEfnWUca9bFcr5YFE9r6f511P8VWgrPJUbywE IxB6Zw7BDtC1FoxZcE/iXs0WrkqGQ7+YKAzNxOiTN1Ek0D3J X-Developer-Key: i=u.kleine-koenig@pengutronix.de; a=openpgp; fpr=0D2511F322BFAB1C1580266BE2DCDD9132669BD6 X-SA-Exim-Connect-IP: 2a0a:edc0:0:c01:1d::a2 X-SA-Exim-Mail-From: ukl@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-spi@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org The pm resume call is supposed to enable two clocks. If the second enable fails the callback reports failure but doesn't undo the first enable. So call clk_disable() for the first clock when clk_enable() for the second one fails. Fixes: 4a2f83b7f780 ("spi: atmel-quadspi: add runtime pm support") Signed-off-by: Uwe Kleine-König Reviewed-by: Tudor Ambarus --- drivers/spi/atmel-quadspi.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/spi/atmel-quadspi.c b/drivers/spi/atmel-quadspi.c index f4632cb07495..0c6f80ddea57 100644 --- a/drivers/spi/atmel-quadspi.c +++ b/drivers/spi/atmel-quadspi.c @@ -786,7 +786,11 @@ static int __maybe_unused atmel_qspi_runtime_resume(struct device *dev) if (ret) return ret; - return clk_enable(aq->qspick); + ret = clk_enable(aq->qspick); + if (ret) + clk_disable(aq->pclk); + + return ret; } static const struct dev_pm_ops __maybe_unused atmel_qspi_pm_ops = { From patchwork Fri Mar 17 08:42:31 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= X-Patchwork-Id: 664920 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EE6B6C761A6 for ; Fri, 17 Mar 2023 08:44:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231651AbjCQIoL (ORCPT ); Fri, 17 Mar 2023 04:44:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35438 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231655AbjCQIn4 (ORCPT ); Fri, 17 Mar 2023 04:43:56 -0400 Received: from metis.ext.pengutronix.de (metis.ext.pengutronix.de [IPv6:2001:67c:670:201:290:27ff:fe1d:cc33]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BBA207B13C for ; Fri, 17 Mar 2023 01:42:49 -0700 (PDT) Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1pd5fc-0004to-Rr; Fri, 17 Mar 2023 09:42:40 +0100 Received: from [2a0a:edc0:0:900:1d::77] (helo=ptz.office.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtp (Exim 4.94.2) (envelope-from ) id 1pd5fc-004jZY-8H; Fri, 17 Mar 2023 09:42:40 +0100 Received: from ukl by ptz.office.stw.pengutronix.de with local (Exim 4.94.2) (envelope-from ) id 1pd5fb-005ZuL-EQ; Fri, 17 Mar 2023 09:42:39 +0100 From: =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= To: Mark Brown , Nicolas Ferre , Alexandre Belloni , Claudiu Beznea Cc: linux-spi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kernel@pengutronix.de Subject: [PATCH 2/3] spi: atmel-quadspi: Free resources even if runtime resume failed in .remove() Date: Fri, 17 Mar 2023 09:42:31 +0100 Message-Id: <20230317084232.142257-3-u.kleine-koenig@pengutronix.de> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230317084232.142257-1-u.kleine-koenig@pengutronix.de> References: <20230317084232.142257-1-u.kleine-koenig@pengutronix.de> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2038; i=u.kleine-koenig@pengutronix.de; h=from:subject; bh=wcZEDK6jMK5sZr1RQTMLf3OvBQXFaDeXg787/wcigb4=; b=owEBbQGS/pANAwAKAcH8FHityuwJAcsmYgBkFCfss1jfdAoMEQrEI0C4lHiBRK1/GFtyNKexE 3fBs7v1hA+JATMEAAEKAB0WIQR+cioWkBis/z50pAvB/BR4rcrsCQUCZBQn7AAKCRDB/BR4rcrs CQeRB/9pJSiQmrh79W/k7Ts8t5stJ6VTTAZHakpGzwFSCE1/ybXcB6u/CAaTB3DIT69w1w6uU01 8Bi0YvkvSKRRzGLmfGFHf8Q0XMOrjxN7OF/DqdQ5fnau2xsnUinvkiDSAn8tpesWFoQT3vbea83 2XnA4xscr/PRSl6FH2Ycf0HDV4baK1l2CpNqcOKsrQSsc9s3f1vy4y4R4I/u7j4rI6PbxK1IDSB PvkeNxuMkqpw4HlsKFPRyJP+whkwDY7pEjNnZUZXqATBPmOxt95djEPxoRobHxKEClAWWf+Blai 2XXPciX4lHUpqGJjiSRm4Gbq4V4OGpCJ1dTl3NcUDqUjpi31 X-Developer-Key: i=u.kleine-koenig@pengutronix.de; a=openpgp; fpr=0D2511F322BFAB1C1580266BE2DCDD9132669BD6 X-SA-Exim-Connect-IP: 2a0a:edc0:0:c01:1d::a2 X-SA-Exim-Mail-From: ukl@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-spi@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org An early error exit in atmel_qspi_remove() doesn't prevent the device unbind. So this results in an spi controller with an unbound parent and unmapped register space (because devm_ioremap_resource() is undone). So using the remaining spi controller probably results in an oops. Instead unregister the controller unconditionally and only skip hardware access and clk disable. Also add a warning about resume failing and return zero unconditionally. The latter has the only effect to suppress a less helpful error message by the spi core. Fixes: 4a2f83b7f780 ("spi: atmel-quadspi: add runtime pm support") Signed-off-by: Uwe Kleine-König --- drivers/spi/atmel-quadspi.c | 24 +++++++++++++++++------- 1 file changed, 17 insertions(+), 7 deletions(-) diff --git a/drivers/spi/atmel-quadspi.c b/drivers/spi/atmel-quadspi.c index 0c6f80ddea57..713a4d6700fd 100644 --- a/drivers/spi/atmel-quadspi.c +++ b/drivers/spi/atmel-quadspi.c @@ -706,18 +706,28 @@ static int atmel_qspi_remove(struct platform_device *pdev) struct atmel_qspi *aq = spi_controller_get_devdata(ctrl); int ret; - ret = pm_runtime_resume_and_get(&pdev->dev); - if (ret < 0) - return ret; - spi_unregister_controller(ctrl); - atmel_qspi_write(QSPI_CR_QSPIDIS, aq, QSPI_CR); + + ret = pm_runtime_get_sync(&pdev->dev); + if (ret >= 0) { + atmel_qspi_write(QSPI_CR_QSPIDIS, aq, QSPI_CR); + clk_disable(aq->qspick); + clk_disable(aq->pclk); + } else { + /* + * atmel_qspi_runtime_{suspend,resume} just disable and enable + * the two clks respectively. So after resume failed these are + * off, and we skip hardware access and disabling these clks again. + */ + dev_warn(&pdev->dev, "Failed to resume device on remove\n"); + } + + clk_unprepare(aq->qspick); + clk_unprepare(aq->pclk); pm_runtime_disable(&pdev->dev); pm_runtime_put_noidle(&pdev->dev); - clk_disable_unprepare(aq->qspick); - clk_disable_unprepare(aq->pclk); return 0; } From patchwork Fri Mar 17 08:42:32 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= X-Patchwork-Id: 664698 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DFEF7C7619A for ; Fri, 17 Mar 2023 08:44:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231612AbjCQIoJ (ORCPT ); Fri, 17 Mar 2023 04:44:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35420 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231621AbjCQIny (ORCPT ); Fri, 17 Mar 2023 04:43:54 -0400 Received: from metis.ext.pengutronix.de (metis.ext.pengutronix.de [IPv6:2001:67c:670:201:290:27ff:fe1d:cc33]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D57495ADE6 for ; Fri, 17 Mar 2023 01:42:48 -0700 (PDT) Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1pd5fd-0004u1-7M; Fri, 17 Mar 2023 09:42:41 +0100 Received: from [2a0a:edc0:0:900:1d::77] (helo=ptz.office.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtp (Exim 4.94.2) (envelope-from ) id 1pd5fc-004jZb-JZ; Fri, 17 Mar 2023 09:42:40 +0100 Received: from ukl by ptz.office.stw.pengutronix.de with local (Exim 4.94.2) (envelope-from ) id 1pd5fb-005ZuO-LR; Fri, 17 Mar 2023 09:42:39 +0100 From: =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= To: Mark Brown , Nicolas Ferre , Alexandre Belloni , Claudiu Beznea Cc: linux-spi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kernel@pengutronix.de Subject: [PATCH 3/3] spi: atmel-quadspi: Convert to platform remove callback returning void Date: Fri, 17 Mar 2023 09:42:32 +0100 Message-Id: <20230317084232.142257-4-u.kleine-koenig@pengutronix.de> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230317084232.142257-1-u.kleine-koenig@pengutronix.de> References: <20230317084232.142257-1-u.kleine-koenig@pengutronix.de> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1791; i=u.kleine-koenig@pengutronix.de; h=from:subject; bh=PDDARCztnzeeACQTDkoYpF/WOv+1r9Jt3pt2LXsIig0=; b=owGbwMvMwMV48I9IxdpTbzgZT6slMaSIqL/X1nzoEVj3sF3lTjtn5t2zH7Qy3il/FTGcFxGmb xP1m127k9GYhYGRi0FWTJGlrkhLbILEmv92JUu4YQaxMoFMYeDiFICJTKxl/2cXEB3T4M1bu7kg SSzpy4zNVuvmRRQt/bTMQDfXllF8xtIPysv9K2LPpHoXSc6zi8h44d30pnN97YvJrUn1v3e08/y ryV30rao1T+SSNlth4UJRFm7FdzM9eYP5d8Q0RjDnTTmglGJef/DS9IzbMzQ+J9Utv7dC1thHrV pboljAnJ39x7foEreZR6sDWJKT91Soc0p8NtOWl5gwv7vnSFMW886Xs9tvF1/S/1RzX7TkWY+p6 q//r60vOyUf8AotfXHh5aYNj/N+9Raum/r1QOdx+Yb5DFOn7ox+7KuyzHZuhkTe5aU750t0LD6w JnL+u4MdPu1cnj+emCYv/1sRmsfZusx/15OKnJfVObk/AQ== X-Developer-Key: i=u.kleine-koenig@pengutronix.de; a=openpgp; fpr=0D2511F322BFAB1C1580266BE2DCDD9132669BD6 X-SA-Exim-Connect-IP: 2a0a:edc0:0:c01:1d::a2 X-SA-Exim-Mail-From: ukl@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-spi@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org The .remove() callback for a platform driver returns an int which makes many driver authors wrongly assume it's possible to do error handling by returning an error code. However the value returned is (mostly) ignored and this typically results in resource leaks. To improve here there is a quest to make the remove callback return void. In the first step of this quest all drivers are converted to .remove_new() which already returns void. Trivially convert this driver from always returning zero in the remove callback to the void returning variant. Signed-off-by: Uwe Kleine-König Reviewed-by: Tudor Ambarus --- drivers/spi/atmel-quadspi.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/drivers/spi/atmel-quadspi.c b/drivers/spi/atmel-quadspi.c index 713a4d6700fd..3d1252566134 100644 --- a/drivers/spi/atmel-quadspi.c +++ b/drivers/spi/atmel-quadspi.c @@ -700,7 +700,7 @@ static int atmel_qspi_probe(struct platform_device *pdev) return err; } -static int atmel_qspi_remove(struct platform_device *pdev) +static void atmel_qspi_remove(struct platform_device *pdev) { struct spi_controller *ctrl = platform_get_drvdata(pdev); struct atmel_qspi *aq = spi_controller_get_devdata(ctrl); @@ -727,8 +727,6 @@ static int atmel_qspi_remove(struct platform_device *pdev) pm_runtime_disable(&pdev->dev); pm_runtime_put_noidle(&pdev->dev); - - return 0; } static int __maybe_unused atmel_qspi_suspend(struct device *dev) @@ -837,7 +835,7 @@ static struct platform_driver atmel_qspi_driver = { .pm = pm_ptr(&atmel_qspi_pm_ops), }, .probe = atmel_qspi_probe, - .remove = atmel_qspi_remove, + .remove_new = atmel_qspi_remove, }; module_platform_driver(atmel_qspi_driver);