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Date:   Wed, 17 Aug 2022 12:28:46 -0700
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Subject: Re: [PATCH v2 2/2] scsi: sd: Rework asynchronous resume support
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To:     Vlastimil Babka <vbabka@suse.cz>,
        Geert Uytterhoeven <geert@linux-m68k.org>
Cc:     "Martin K . Petersen" <martin.petersen@oracle.com>,
        Jaegeuk Kim <jaegeuk@kernel.org>,
        scsi <linux-scsi@vger.kernel.org>,
        Ming Lei <ming.lei@redhat.com>, Hannes Reinecke <hare@suse.de>,
        John Garry <john.garry@huawei.com>, ericspero@icloud.com,
        jason600.groome@gmail.com,
        Linux-Renesas <linux-renesas-soc@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        linux-ide@vger.kernel.org,
        James Bottomley <James.Bottomley@hansenpartnership.com>,
        regressions@lists.linux.dev
References: <20220630195703.10155-1-bvanassche@acm.org>
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 <54e20a27-a10b-b77a-e950-1d3398e2e907@acm.org>
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 <40700595-8c83-1b61-ea93-ea9554bfb2db@acm.org>
 <98592410-dd31-9081-86be-fda67d3b06d2@suse.cz>
From:   Bart Van Assche <bvanassche@acm.org>
In-Reply-To: <98592410-dd31-9081-86be-fda67d3b06d2@suse.cz>
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On 8/17/22 12:07, Vlastimil Babka wrote:
> In my case it's
> /sys/devices/pci0000:00/0000:00:17.0/ata1/host0/scsi_host/host0/proc_name:ahci
> /sys/devices/pci0000:00/0000:00:17.0/ata2/host1/scsi_host/host1/proc_name:ahci
> 
> Some more details from dmesg
> 
> [    0.849373] ata2: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
> [    0.852849] ata2.00: ACPI cmd f5/00:00:00:00:00:a0(SECURITY FREEZE LOCK) filtered out
> [    0.854671] ata2.00: supports DRM functions and may not be fully accessible
> [    0.856181] ata2.00: ATA-9: SAMSUNG MZ7LN512HMJP-000L7, MAV01L6Q, max UDMA/133
> [    0.858115] ata2.00: 1000215216 sectors, multi 1: LBA48 NCQ (depth 32), AA
> [    0.861584] ata2.00: Features: Trust Dev-Sleep NCQ-sndrcv
> [    0.863749] ata2.00: ACPI cmd f5/00:00:00:00:00:a0(SECURITY FREEZE LOCK) filtered out
> [    0.865481] ata2.00: supports DRM functions and may not be fully accessible
> [    0.870043] ata2.00: configured for UDMA/133
> [    0.871871] scsi 1:0:0:0: Direct-Access     ATA      SAMSUNG MZ7LN512 1L6Q PQ: 0 ANSI: 5
> 
> Please Cc me on further questions/steps to try/patches to test.

Hi Vlastimil,

Thank you for having provided the above information. The root cause of 
the hang is not yet clear to me. I was wondering whether the hang 
perhaps would be triggered by controllers that only support queue depth 
1. However, in the above output I see "depth 32".

As already reported in this email thread a revert for commit 
88f1669019bd62b3 has been posted on the linux-scsi mailing list. 
Additionally, Greg KH has been asked to drop that patch from the stable 
trees.

Thanks,

Bart.