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Subject: media: qcom: camss: Fix ordering of pm_runtime_enable Author: Bryan O'Donoghue bryan.odonoghue@linaro.org Date: Mon Jul 29 13:42:03 2024 +0100
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 johan+linaro@kernel.org Closes: https://lore.kernel.org/lkml/ZoVNHOTI0PKMNt4_@hovoldconsulting.com/ Tested-by: Johan Hovold johan+linaro@kernel.org Cc: stable@vger.kernel.org Signed-off-by: Bryan O'Donoghue bryan.odonoghue@linaro.org Reviewed-by: Konrad Dybcio konradybcio@kernel.org Signed-off-by: Hans Verkuil hverkuil-cisco@xs4all.nl
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 @@ err_register_subdevs: 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);