From patchwork Tue Aug 22 20:06:20 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bryan O'Donoghue X-Patchwork-Id: 715798 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 F1BEFEE49AF for ; Tue, 22 Aug 2023 20:06:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230366AbjHVUGk (ORCPT ); Tue, 22 Aug 2023 16:06:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40566 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230336AbjHVUGh (ORCPT ); Tue, 22 Aug 2023 16:06:37 -0400 Received: from mail-wr1-x431.google.com (mail-wr1-x431.google.com [IPv6:2a00:1450:4864:20::431]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D4019CEE for ; Tue, 22 Aug 2023 13:06:34 -0700 (PDT) Received: by mail-wr1-x431.google.com with SMTP id ffacd0b85a97d-3159d5e409dso3765396f8f.0 for ; Tue, 22 Aug 2023 13:06:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1692734793; x=1693339593; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=OFC5befy1B0F6DaTi/N+wys/sVJv12I6nLzZb1Lm1oY=; b=d0WBoA0WWQC/vb52sZv9vPGSanvUji7KX0y7Ts1JWHJqwfEm12Wu0k3rqlB7NcO3GR yMXbE2i4UJ87eF8Z3+IFs6M6BiGhbE7yYXw4lssfBeUaI44FJvBHPRAkFOujzUmInA5V PYAzTd0jbytTE3UZAjzptmQkrDd8/eLsbfavOcRt8oJOtYLrqwSAlODmkcU4P94uerF3 qkqr/SuDGOcXu4CRpbVjmGpEwxcvIddibisBHjl/NlFhQUQJ7kTr1jR/VhKoDQZi/mvU /ze7J/vqbD0d+Jwtlnt/1jbI2bjXkFQ47IY+OWHlL0wiVf+bQjYWzjWqXq1nT5aMPPtO YEOQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1692734793; x=1693339593; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=OFC5befy1B0F6DaTi/N+wys/sVJv12I6nLzZb1Lm1oY=; b=U2ItrRPtH39QTn3pzzcX8O8xuRA7gQvYENnUeM9d9ilRFaCZGh35EuocaBaIcgU03/ 0adS6o0rqy7S2a1ljnlkpU0WHCRXd3UpgYIMq09RSQIBHh8OLS29Oh0A5RlRUBswKsUX RY7NMUdY9AAN7GEOYEfQxH98b6dF59I0L05LKpCYxfuO4NbYDms109ZJVpRVRnKdtK4S iy7XY1HpFP/97boFqx3/MNfECaDOVv0fQho1NAQJQ1N+uWW/vQL1x4iPkUbnMWjhpG2H TqU2P0Hx7ScMa48Cy3anrz9NmgiOckuR7QH1lcNOCd5K8RjVFDXBslUgCAmP0QpTSuqX F2Iw== X-Gm-Message-State: AOJu0Yxu5+by8zqUQd0Bd34eAKgzhAzBQF8LYuYhP4tSYfajRzoMaklh 5D+swVaYtbSHs0hadhplOBwUNQ== X-Google-Smtp-Source: AGHT+IEz8kbqeiCPikQZtaldhZ4L98TZeKwAoyjtudgWaOIkZS8VBAYHD1esNnBmjh51/AAdWqpD9w== X-Received: by 2002:adf:e704:0:b0:314:2f3e:dca5 with SMTP id c4-20020adfe704000000b003142f3edca5mr9847764wrm.28.1692734793459; Tue, 22 Aug 2023 13:06:33 -0700 (PDT) Received: from sagittarius-a.chello.ie (188-141-3-169.dynamic.upc.ie. [188.141.3.169]) by smtp.gmail.com with ESMTPSA id y12-20020adfee0c000000b0031aeca90e1fsm12873690wrn.70.2023.08.22.13.06.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 22 Aug 2023 13:06:32 -0700 (PDT) From: Bryan O'Donoghue To: rfoss@kernel.org, todor.too@gmail.com, bryan.odonoghue@linaro.org, agross@kernel.org, andersson@kernel.org, konrad.dybcio@linaro.org, mchehab@kernel.org, hverkuil-cisco@xs4all.nl, laurent.pinchart@ideasonboard.com, sakari.ailus@linux.intel.com, andrey.konovalov@linaro.org Cc: linux-media@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH v2 3/9] media: qcom: camss: Fix vfe_get() error jump Date: Tue, 22 Aug 2023 21:06:20 +0100 Message-ID: <20230822200626.1931129-4-bryan.odonoghue@linaro.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230822200626.1931129-1-bryan.odonoghue@linaro.org> References: <20230822200626.1931129-1-bryan.odonoghue@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Right now it is possible to do a vfe_get() with the internal reference count at 1. If vfe_check_clock_rates() returns non-zero then we will leave the reference count as-is and run: - pm_runtime_put_sync() - vfe->ops->pm_domain_off() skip: - camss_disable_clocks() Subsequent vfe_put() calls will when the ref-count is non-zero unconditionally run: - pm_runtime_put_sync() - vfe->ops->pm_domain_off() - camss_disable_clocks() vfe_get() should not attempt to roll-back on error when the ref-count is non-zero as the upper layers will still do their own vfe_put() operations. vfe_put() will drop the reference count and do the necessary power domain release, the cleanup jumps in vfe_get() should only be run when the ref-count is zero. [ 50.095796] CPU: 7 PID: 3075 Comm: cam Not tainted 6.3.2+ #80 [ 50.095798] Hardware name: LENOVO 21BXCTO1WW/21BXCTO1WW, BIOS N3HET82W (1.54 ) 05/26/2023 [ 50.095799] pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) [ 50.095802] pc : refcount_warn_saturate+0xf4/0x148 [ 50.095804] lr : refcount_warn_saturate+0xf4/0x148 [ 50.095805] sp : ffff80000c7cb8b0 [ 50.095806] x29: ffff80000c7cb8b0 x28: ffff16ecc0e3fc10 x27: 0000000000000000 [ 50.095810] x26: 0000000000000000 x25: 0000000000020802 x24: 0000000000000000 [ 50.095813] x23: ffff16ecc7360640 x22: 00000000ffffffff x21: 0000000000000005 [ 50.095815] x20: ffff16ed175f4400 x19: ffffb4d9852942a8 x18: ffffffffffffffff [ 50.095818] x17: ffffb4d9852d4a48 x16: ffffb4d983da5db8 x15: ffff80000c7cb320 [ 50.095821] x14: 0000000000000001 x13: 2e656572662d7265 x12: 7466612d65737520 [ 50.095823] x11: 00000000ffffefff x10: ffffb4d9850cebf0 x9 : ffffb4d9835cf954 [ 50.095826] x8 : 0000000000017fe8 x7 : c0000000ffffefff x6 : 0000000000057fa8 [ 50.095829] x5 : ffff16f813fe3d08 x4 : 0000000000000000 x3 : ffff621e8f4d2000 [ 50.095832] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff16ed32119040 [ 50.095835] Call trace: [ 50.095836] refcount_warn_saturate+0xf4/0x148 [ 50.095838] device_link_put_kref+0x84/0xc8 [ 50.095843] device_link_del+0x38/0x58 [ 50.095846] vfe_pm_domain_off+0x3c/0x50 [qcom_camss] [ 50.095860] vfe_put+0x114/0x140 [qcom_camss] [ 50.095869] csid_set_power+0x2c8/0x408 [qcom_camss] [ 50.095878] pipeline_pm_power_one+0x164/0x170 [videodev] [ 50.095896] pipeline_pm_power+0xc4/0x110 [videodev] [ 50.095909] v4l2_pipeline_pm_use+0x5c/0xa0 [videodev] [ 50.095923] v4l2_pipeline_pm_get+0x1c/0x30 [videodev] [ 50.095937] video_open+0x7c/0x100 [qcom_camss] [ 50.095945] v4l2_open+0x84/0x130 [videodev] [ 50.095960] chrdev_open+0xc8/0x250 [ 50.095964] do_dentry_open+0x1bc/0x498 [ 50.095966] vfs_open+0x34/0x40 [ 50.095968] path_openat+0xb44/0xf20 [ 50.095971] do_filp_open+0xa4/0x160 [ 50.095974] do_sys_openat2+0xc8/0x188 [ 50.095975] __arm64_sys_openat+0x6c/0xb8 [ 50.095977] invoke_syscall+0x50/0x128 [ 50.095982] el0_svc_common.constprop.0+0x4c/0x100 [ 50.095985] do_el0_svc+0x40/0xa8 [ 50.095988] el0_svc+0x2c/0x88 [ 50.095991] el0t_64_sync_handler+0xf4/0x120 [ 50.095994] el0t_64_sync+0x190/0x198 [ 50.095996] ---[ end trace 0000000000000000 ]--- Fixes: 779096916dae ("media: camss: vfe: Fix runtime PM imbalance on error") Cc: stable@vger.kernel.org Signed-off-by: Bryan O'Donoghue Reviewed-by: Laurent Pinchart --- drivers/media/platform/qcom/camss/camss-vfe.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/media/platform/qcom/camss/camss-vfe.c b/drivers/media/platform/qcom/camss/camss-vfe.c index dabfd613b2f94..938f373bcd1fd 100644 --- a/drivers/media/platform/qcom/camss/camss-vfe.c +++ b/drivers/media/platform/qcom/camss/camss-vfe.c @@ -611,7 +611,7 @@ int vfe_get(struct vfe_device *vfe) } else { ret = vfe_check_clock_rates(vfe); if (ret < 0) - goto error_pm_runtime_get; + goto error_pm_domain; } vfe->power_count++;