Re: [PATCH v4 4/4] PCI/ATS: Mandate checking pci_ats_supported() before pci_prepare_ats()

[sashiko-bot@kernel.org]

> Currently, pci_prepare_ats() internally calls pci_ats_supported() and
> returns -EINVAL if the device does not support ATS. While this provides
> a silent safety check, it conflates support detection with configuration.
> 
> Update pci_prepare_ats() to wrap the internal pci_ats_supported check in
> a WARN_ON(). This mandates all callers to call pci_prepare_ats() only if
> the function supports ATS.
> 
> Update the function documentation to mention that callers must verify
> ATS support (via pci_ats_supported()) before calling pci_prepare_ats().
> 
> Reviewed-by: Vasant Hegde <vasant.hegde@amd.com>
> Suggested-by: Baolu Lu <baolu.lu@linux.intel.com>
> Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
> Signed-off-by: Pranjal Shrivastava <praan@google.com>

Sashiko has reviewed this patch and found no issues. It looks great!

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Sashiko AI review · https://sashiko.dev/#/patchset/20260910142655.3281464-1-praan@google.com?part=4