Re: [PATCH 4/4] serial: vt8500: Drop the port index bitmap

[sashiko-bot@kernel.org]

> Stop reserving a line in the vt8500_ports_in_use bitmap before probe
> acquires its resources: nothing ever clears the bit, so an early probe
> failure strands the line, and a retry then fails with -EBUSY on an
> aliased port or drifts to the next free index on an unaliased one.
> 
> Pick the line from the serial core state instead and let
> uart_add_one_port() claim it, as the core already refuses a taken line
> under its port mutex. Rely on that for concurrent probes too, so that a
> racing probe fails cleanly with no driver state to roll back.
> 
> Keep the allocation policy as is: honour an in-range "serial" alias,
> otherwise fall back to the first free line.
> 
> Fixes: 4001130df1a7 ("serial: vt8500: Add devicetree support for vt8500-serial")
> Reported-by: Sashiko <sashiko-bot@kernel.org>
> Closes: https://sashiko.dev/#/bug/linux-ca000721-4a5b-4d88-bdb8-7f1e438dc81e
> Signed-off-by: Alexey Charkov <alchark@gmail.com>

Sashiko has reviewed this patch and found no issues.

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Sashiko AI review · https://sashiko.dev/#/patchset/20261111-vt8500-serial-cleanup-v1-0-b33594a25f87@gmail.com?part=4