Re: [PATCH 1/3] s390/dasd: Fix path verification interrupted by concurrent dasd_sleep_on_immediatly

[sashiko-bot@kernel.org]

> When all channel paths to a DASD device are lost and subsequently
> recovered, the path event handler starts one IO per path via
> dasd_sleep_on_immediatly() to execute read configuration data (RCD) with
> high priority.
> 
> dasd_sleep_on_immediatly() works by terminating the currently running
> request before inserting the new request.
> If a concurrent caller, such as the attention handler
> dasd_eckd_check_attention_work() or the summary unit
> check handler summary_unit_check_handling_work(), also calls
> dasd_sleep_on_immediatly() while a path verification RCD is in progress,
> the RCD gets terminated.
> 
> The problem is that a terminated request transitions from CLEARED to
> TERMINATED without going through the normal retry path in
> [ ... ]
> (attention handler, summary unit check handler, reserve/release/steal-lock)
> benefit automatically without requiring changes.
> 
> Reviewed-by: Jan Höppner <hoeppner@linux.ibm.com>
> Signed-off-by: Stefan Haberland <sth@linux.ibm.com>

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

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Sashiko AI review · https://sashiko.dev/#/patchset/20260727142840.567286-1-sth@linux.ibm.com?part=1