From: Michal Pecio <michal.pecio@gmail.com>
To: Jiayi Li <lijiayi@kylinos.cn>
Cc: Oliver Neukum <oneukum@suse.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Alan Stern <stern@rowland.harvard.edu>,
linux-usb@vger.kernel.org, linux-scsi@vger.kernel.org,
usb-storage@lists.one-eyed-alien.net,
linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH] usb: uas: quiesce SCSI before stopping endpoints on driver unbind
Date: Mon, 21 Sep 2026 09:26:15 +0200 [thread overview]
Message-ID: <20260921092615.7402711d.michal.pecio@gmail.com> (raw)
In-Reply-To: <20260920012358.3362053-1-lijiayi@kylinos.cn>
On Sun, 20 Sep 2026 09:23:58 +0800, Jiayi Li wrote:
> A driver-only unbind of uas while reads are in flight can leave the
> storage device unusable after the driver is rebound.
Question to people who have the UAS spec (seems to be paywalled?):
is there any chance that Linux fails to perform some UAS-level reset
that devices expect?
This seems to be the second case where some bad UAS state persists in
a device after USB reset (in the other case: even after reconnection).
> [ 5138.886447] sd 0:0:0:0: [sda] tag#0 uas_zap_pending 0 uas-tag 1 inflight: CMD
> [ 5138.886674] sd 0:0:0:0: [sda] tag#0 FAILED Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK cmd_age=0s
> [ 5138.886682] I/O error, dev sda, sector 75497472 op 0x0:(READ) flags 0x4800 phys_seg 128 prio class 2
> [ 5139.077259] sd 0:0:0:0: [sda] Synchronize Cache(10) failed: Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK
> [ 5141.100631] scsi host0: uas
> [ 5141.103134] scsi 0:0:0:0: tag#12 data cmplt err -75 uas-tag 1 inflight: CMD
> [ 5141.103160] scsi 0:0:0:0: tag#12 CDB: Inquiry 12 00 00 00 24 00
> [ 5161.649075] scsi 0:0:0:0: tag#12 uas_eh_abort_handler 0 uas-tag 1 inflight: CMD
> [ 5161.653963] xhci_hcd 0000:00:12.0: Transfer event 26 for unknown stream ring slot 4 ep 14
This is actually an anomaly, transfer events should always point
to valid rings. Device sendig bogus Stream ID would be code 34:
Invalid Stream ID Error.
Is this an ASMedia host controller? PCI ID doesn't looke like one...
Regards,
Michal
next prev parent reply other threads:[~2026-09-21 7:26 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-20 1:23 Jiayi Li
2026-09-20 2:34 ` Alan Stern
2026-09-21 2:58 ` Jiayi Li
2026-09-21 7:26 ` Michal Pecio [this message]
2026-09-21 9:44 ` Jiayi Li
2026-09-21 10:24 ` Oliver Neukum
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