From: Oliver Neukum <oneukum@suse.com>
To: Kento.A.Kobayashi@sony.com, gregkh@linuxfoundation.org,
stern@rowland.harvard.edu
Cc: usb-storage@lists.one-eyed-alien.net,
linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org,
linux-usb@vger.kernel.org
Subject: Re: [PATCH] usb: uas: fix usb subsystem hang after power off hub port
Date: Fri, 08 Mar 2019 17:52:08 +0100 [thread overview]
Message-ID: <1552063928.29776.2.camel@suse.com> (raw)
In-Reply-To: <AE5419EAB4965843B3C0C1FE29F1FFE5872241@JPYOKXMS103.jp.sony.com>
On Fr, 2019-03-08 at 09:13 +0000, Kento.A.Kobayashi@sony.com wrote:
> The usb_reset_and_verify_device included in usb_reset_device fails
> with -ENODEV after power off hub port, and the -ENODEV error will
> be reported to uas_eh_bus_reset_handler and upper layer, so it
> doesn't need to do rebind if -ENODEV happens.
Hi,
no I am sorry, that is an assumption you just cannot make.
Anything can trigger a reset. That being SCSI is the common
case certainly, but not the only case. And in those cases
we cannot depend on upper layers doing the right thing, if
we just ignore an error.
NACK
Sorry
Oliver
WARNING: multiple messages have this Message-ID (diff)
From: Oliver Neukum <oneukum@suse.com>
To: Kento.A.Kobayashi@sony.com, gregkh@linuxfoundation.org,
stern@rowland.harvard.edu
Cc: usb-storage@lists.one-eyed-alien.net,
linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org,
linux-usb@vger.kernel.org
Subject: usb: uas: fix usb subsystem hang after power off hub port
Date: Fri, 08 Mar 2019 17:52:08 +0100 [thread overview]
Message-ID: <1552063928.29776.2.camel@suse.com> (raw)
On Fr, 2019-03-08 at 09:13 +0000, Kento.A.Kobayashi@sony.com wrote:
> The usb_reset_and_verify_device included in usb_reset_device fails
> with -ENODEV after power off hub port, and the -ENODEV error will
> be reported to uas_eh_bus_reset_handler and upper layer, so it
> doesn't need to do rebind if -ENODEV happens.
Hi,
no I am sorry, that is an assumption you just cannot make.
Anything can trigger a reset. That being SCSI is the common
case certainly, but not the only case. And in those cases
we cannot depend on upper layers doing the right thing, if
we just ignore an error.
NACK
Sorry
Oliver
next prev parent reply other threads:[~2019-03-08 17:03 UTC|newest]
Thread overview: 82+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-08 9:13 [PATCH] usb: uas: fix usb subsystem hang after power off hub port Kento.A.Kobayashi
2019-03-08 9:13 ` Kento.A.Kobayashi
2019-03-08 9:13 ` Kento.A.Kobayashi
2019-03-08 16:52 ` Oliver Neukum [this message]
2019-03-08 16:52 ` Oliver Neukum
2019-03-08 17:33 ` [PATCH] " Alan Stern
2019-03-08 17:33 ` Alan Stern
2019-03-08 17:33 ` Alan Stern
2019-03-11 8:36 ` [PATCH] " Kento.A.Kobayashi
2019-03-11 8:36 ` Kento.A.Kobayashi
2019-03-11 8:36 ` Kento.A.Kobayashi
2019-03-12 15:37 ` [PATCH] " Oliver Neukum
2019-03-12 15:37 ` Oliver Neukum
2019-03-15 2:28 ` [PATCH] " Kento.A.Kobayashi
2019-03-15 2:28 ` Kento.A.Kobayashi
2019-03-15 2:28 ` Kento.A.Kobayashi
2019-03-25 10:21 ` [PATCH] " Kento.A.Kobayashi
2019-03-25 10:21 ` Kento.A.Kobayashi
2019-03-25 10:21 ` Kento.A.Kobayashi
2019-03-25 10:34 ` [PATCH] " Oliver Neukum
2019-03-25 10:34 ` Oliver Neukum
2019-03-28 7:53 ` [PATCH] " Kento.A.Kobayashi
2019-03-28 7:53 ` Kento.A.Kobayashi
2019-03-28 7:53 ` Kento.A.Kobayashi
2019-03-28 15:15 ` [PATCH] " Oliver Neukum
2019-03-28 15:15 ` Oliver Neukum
2019-03-28 15:57 ` [PATCH] " Alan Stern
2019-03-28 15:57 ` Alan Stern
2019-03-28 15:57 ` Alan Stern
2019-03-28 16:49 ` [PATCH] " Oliver Neukum
2019-03-28 16:49 ` Oliver Neukum
2019-03-29 14:13 ` [PATCH] " Alan Stern
2019-03-29 14:13 ` Alan Stern
2019-03-29 14:13 ` Alan Stern
2019-04-02 0:28 ` [PATCH] " Kento.A.Kobayashi
2019-04-02 0:28 ` Kento.A.Kobayashi
2019-04-02 0:28 ` Kento.A.Kobayashi
2019-04-02 14:38 ` [PATCH] " Alan Stern
2019-04-02 14:38 ` Alan Stern
2019-04-02 14:38 ` Alan Stern
2019-04-04 3:57 ` [PATCH] " Kento.A.Kobayashi
2019-04-04 3:57 ` Kento.A.Kobayashi
2019-04-04 3:57 ` Kento.A.Kobayashi
2019-04-04 19:33 ` [PATCH] " Alan Stern
2019-04-04 19:33 ` Alan Stern
2019-04-04 19:33 ` Alan Stern
2019-04-09 0:28 ` [PATCH] " Kento.A.Kobayashi
2019-04-09 0:28 ` Kento.A.Kobayashi
2019-04-09 0:28 ` Kento.A.Kobayashi
2019-04-09 1:21 ` [PATCH] " Alan Stern
2019-04-09 1:21 ` Alan Stern
2019-04-09 1:21 ` Alan Stern
2019-04-09 2:10 ` [PATCH] " Martin K. Petersen
2019-04-09 2:10 ` Martin K. Petersen
2019-04-09 2:10 ` Martin K. Petersen
2019-04-09 14:44 ` [PATCH] " Alan Stern
2019-04-09 14:44 ` Alan Stern
2019-04-09 14:44 ` Alan Stern
2019-04-09 15:16 ` [PATCH] " Bart Van Assche
2019-04-09 15:16 ` Bart Van Assche
2019-04-09 15:16 ` Bart Van Assche
2019-04-09 15:16 ` Bart Van Assche
2019-04-09 16:45 ` [PATCH] " Alan Stern
2019-04-09 16:45 ` Alan Stern
2019-04-09 16:45 ` Alan Stern
2019-04-15 0:27 ` [PATCH] " Kento.A.Kobayashi
2019-04-15 0:27 ` Kento.A.Kobayashi
2019-04-15 0:27 ` Kento.A.Kobayashi
2019-04-15 15:18 ` [PATCH] " Alan Stern
2019-04-15 15:18 ` Alan Stern
2019-04-15 15:18 ` Alan Stern
2019-04-15 15:32 ` [PATCH] " Alan Stern
2019-04-15 15:32 ` Alan Stern
2019-04-15 15:32 ` Alan Stern
2019-04-16 2:31 ` [PATCH] " Kento.A.Kobayashi
2019-04-16 2:31 ` Kento.A.Kobayashi
2019-04-16 2:31 ` Kento.A.Kobayashi
2019-04-10 2:11 ` [PATCH] " Martin K. Petersen
2019-04-10 2:11 ` Martin K. Petersen
[not found] <16EA1F625E922C43B00B9D8225022050086961B5@APYOKXMS108.ap.sony.com>
2019-03-04 6:23 ` [PATCH] " Greg KH
2019-03-04 7:19 ` Jacky.Cao
2019-03-04 7:19 ` Jacky.Cao
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