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AJvYcCUGJECC12tELHsVJ+vHGIEkEtYF9SxDR0G7lxGNfpVaW98vJD0o0drNLtofVoHZCw3u+9GL0Mp7bqDJnDNkEl0rYNrErRZLqG/kpXsPuw== X-Gm-Message-State: AOJu0Yz/di/63fRiJK3tllAirdWrdaNaasmSdPIuavawF81dPXLXKR29 VlcoxrCPxe5npNIlJPf5fQqSD7si1eqJD4KWt8NTYhg5T7SVS6Hz0IQogH35n4s= X-Google-Smtp-Source: AGHT+IG+MADQTpWKslhKvuJZKyGIHvh1adrMraY/f13ntQtqMtGVpyG6NOKMVQVgZZdl1PITC4I3bw== X-Received: by 2002:a50:a6d7:0:b0:58c:74ae:24ee with SMTP id 4fb4d7f45d1cf-59ef06b97fcmr1807973a12.38.1721167987397; Tue, 16 Jul 2024 15:13:07 -0700 (PDT) Received: from [127.0.1.1] ([176.61.106.227]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-59b268a28ddsm5582997a12.71.2024.07.16.15.13.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 16 Jul 2024 15:13:07 -0700 (PDT) From: Bryan O'Donoghue Date: Tue, 16 Jul 2024 23:13:25 +0100 Subject: [PATCH v2 2/2] media: qcom: camss: Fix ordering of pm_runtime_enable Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240716-linux-next-24-07-13-camss-fixes-v2-2-e60c9f6742f2@linaro.org> References: <20240716-linux-next-24-07-13-camss-fixes-v2-0-e60c9f6742f2@linaro.org> In-Reply-To: <20240716-linux-next-24-07-13-camss-fixes-v2-0-e60c9f6742f2@linaro.org> To: Robert Foss , Todor Tomov , Mauro Carvalho Chehab , Hans Verkuil , Hans Verkuil , Milen Mitkov Cc: linux-media@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, Mauro Carvalho Chehab , Johan Hovold , Bryan O'Donoghue , stable@vger.kernel.org X-Mailer: b4 0.15-dev-13183 pm_runtime_enable() should happen prior to vfe_get() since vfe_get() calls pm_runtime_resume_and_get(). This is a basic race condition that doesn't show up for most users so is not widely reported. If you blacklist qcom-camss in modules.d and then subsequently modprobe the module post-boot it is possible to reliably show this error up. The kernel log for this error looks like this: qcom-camss ac5a000.camss: Failed to power up pipeline: -13 Fixes: 02afa816dbbf ("media: camss: Add basic runtime PM support") Reported-by: Johan Hovold Closes: https://lore.kernel.org/lkml/ZoVNHOTI0PKMNt4_@hovoldconsulting.com/ Tested-by: Johan Hovold Cc: Signed-off-by: Bryan O'Donoghue --- drivers/media/platform/qcom/camss/camss.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/media/platform/qcom/camss/camss.c b/drivers/media/platform/qcom/camss/camss.c index 51b1d3550421..d64985ca6e88 100644 --- a/drivers/media/platform/qcom/camss/camss.c +++ b/drivers/media/platform/qcom/camss/camss.c @@ -2283,6 +2283,8 @@ static int camss_probe(struct platform_device *pdev) v4l2_async_nf_init(&camss->notifier, &camss->v4l2_dev); + pm_runtime_enable(dev); + num_subdevs = camss_of_parse_ports(camss); if (num_subdevs < 0) { ret = num_subdevs; @@ -2323,8 +2325,6 @@ static int camss_probe(struct platform_device *pdev) } } - pm_runtime_enable(dev); - return 0; err_register_subdevs: @@ -2332,6 +2332,7 @@ static int camss_probe(struct platform_device *pdev) err_v4l2_device_unregister: v4l2_device_unregister(&camss->v4l2_dev); v4l2_async_nf_cleanup(&camss->notifier); + pm_runtime_disable(dev); err_genpd_cleanup: camss_genpd_cleanup(camss);