Re: [PATCH 1/2] PCI: use reset_root_port() for bus reset of devices on a root bus

[sashiko-bot@kernel.org]

> The "bus" reset method resets a device by asserting Secondary Bus Reset
> on its upstream bridge, so it is not available for a device on a root
> bus, which has no upstream bridge.
> 
> Some platforms have no Root Ports and expose PCI devices directly on a
> root bus, e.g., Hyper-V vPCI places each assigned PCI function directly
> on the root bus of a virtual host bridge. Such a device has no reset
> method at all if it supports neither FLR nor PM reset, even if the
> platform is able to reset it.
> 
> pci_host_bridge::reset_root_port() already allows a host bridge to reset
> a device on a root bus in a platform-specific way, so far only in place
> of a Secondary Bus Reset by a Root Port. Use it for the "bus" reset
> method of a device that is the only device on a root bus, and wait for
> the device to become ready afterwards, as is done for other reset
> methods.
> 
> Signed-off-by: Hamza Mahfooz <hamzamahfooz@linux.microsoft.com>

Sashiko has reviewed this patch and found no issues.

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Sashiko AI review · https://sashiko.dev/#/patchset/20261016235940.942090-1-hamzamahfooz@linux.microsoft.com?part=1