Re: [PATCH] scsi: libsas: handle linkrate change in sas_rediscover_dev

[Jason Yan]

在 2026/5/12 15:12, Xingui Yang 写道:
> When a device attached to an expander phy experiences a linkrate change
> (e.g., due to cable reconnection or negotiation), the current code in
> sas_rediscover_dev() treats it as "broadcast flutter" and takes no action
> if the SAS address and device type remain unchanged.
>
> However, for drivers like hisi_sas, the ITCT entry needs to be updated to
> reflect the new linkrate. Without this update, the hardware continues
> using stale linkrate information, which can cause performance issues or
> protocol errors.
>
> This patch introduces a new LLDD callback lldd_dev_info_update() to notify
> the low-level driver when a device's linkrate changes, allowing the driver
> to update its hardware structures accordingly.
>
> Additionally, refactor sas_ex_to_ata() to use a new helper function
> sas_ex_to_dev() which returns any device type attached to an expander phy,
> improving code reuse.

Could you split this refactor to another patch? This makes it easier to 
review.

祝一切顺利
Jason