Re: [PATCH v2 2/3] scsi: libsas: add lldd_dev_info_update callback for device info changes

[Jason Yan <yanaijie@huawei.com>]

在 2026/5/13 10:16, 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.
> 
> Introduce a new LLDD callback lldd_dev_info_update() to notify the
> low-level driver when a device's information changes (such as linkrate),
> allowing the driver to update its hardware structures accordingly. This
> callback is designed to be extensible for future device information
> updates.
> 
> Signed-off-by: Xingui Yang<yangxingui@huawei.com>
> ---
>   drivers/scsi/libsas/sas_discover.c | 12 ++++++++++++
>   drivers/scsi/libsas/sas_expander.c | 13 +++++++++++--
>   drivers/scsi/libsas/sas_internal.h |  1 +
>   include/scsi/libsas.h              |  1 +
>   4 files changed, 25 insertions(+), 2 deletions(-)

Reviewed-by: Jason Yan <yanaijie@huawei.com>