linux-kernel - Re: [PATCH v3 3/3] scsi: libsas: Fix disk not being scanned in after being removed

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Date: Thu, 7 Mar 2024 10:08:14 +0000
From: John Garry <john.g.garry@...cle.com>
To: Xingui Yang <yangxingui@...wei.com>, yanaijie@...wei.com,
        jejb@...ux.ibm.com, martin.petersen@...cle.com,
        damien.lemoal@...nsource.wdc.com
Cc: linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        linuxarm@...wei.com, prime.zeng@...ilicon.com,
        chenxiang66@...ilicon.com, kangfenglong@...wei.com
Subject: Re: [PATCH v3 3/3] scsi: libsas: Fix disk not being scanned in after
 being removed

On 07/03/2024 09:37, Xingui Yang wrote:
> As of commit d8649fc1c5e4 ("scsi: libsas: Do discovery on empty PHY to
> update PHY info"), do discovery will send a new SMP_DISCOVER and update
> phy->phy_change_count. We found that if the disk is reconnected and phy
> change_count changes at this time, the disk scanning process will not be
> triggered.
> 
> Therefore, call sas_set_ex_phy() to update the PHY info with the results of
> the last query. And because the previous phy info will be used when calling
> sas_unregister_devs_sas_addr(), sas_unregister_devs_sas_addr() should be
> called before sas_set_ex_phy().
> 
> Fixes: d8649fc1c5e4 ("scsi: libsas: Do discovery on empty PHY to update PHY info")
> Signed-off-by: Xingui Yang<yangxingui@...wei.com>

I am also ok with a change to revert to allocating the resp memory with 
alloc_smp_resp(), but make the changes neat please:
Reviewed-by: John Garry <john.g.garry@...cle.com>