From: Oliver Neukum <oneukum@suse.com>
To: Mathias Nyman <mathias.nyman@linux.intel.com>,
Jonas Karlsson <jonas.karlsson@actia.se>,
Greg KH <gregkh@linuxfoundation.org>
Cc: "linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>
Subject: Re: USB transaction errors causing RCU stalls and kernel panics
Date: Wed, 04 Mar 2020 15:12:53 +0100 [thread overview]
Message-ID: <1583331173.12738.26.camel@suse.com> (raw)
In-Reply-To: <6909d182-6cc5-c07f-ed79-02c741aec60b@linux.intel.com>
Am Mittwoch, den 04.03.2020, 14:11 +0200 schrieb Mathias Nyman:
> On 3.3.2020 22.08, Jonas Karlsson wrote:
>
> I recently got a report about a bit similar issue on a 4.4 stable kernel, so this
> might not be xhci-cdns specific.
>
> That case involved autosuspend of the cdc-acm, and there was only a short burst of
> transaction erros and resubmitted URBs even if the device was supposed to be suspended.
> It looks like cdc_acm autosuspended even if it had URBs pending.
That must not happen. Do you have details?
> I'm guessing that in that case the transfer ring restarted even if link was already "suspeded",
> causing transaction errors. Ring could be restarted if URBs were resubmitted
> by the class driver when usb core suspends all interfaces, flushing all pending URBs which
> calls the URB completion handler.
How should a class driver do that? It gets -EPROTO and that's it,
Regards
Oliver
next prev parent reply other threads:[~2020-03-04 14:13 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-03 15:05 USB transaction errors causing RCU stalls and kernel panics Jonas Karlsson
2020-03-03 16:39 ` Greg KH
2020-03-03 20:08 ` Jonas Karlsson
2020-03-04 6:37 ` Greg KH
2020-03-04 10:29 ` Oliver Neukum
2020-03-04 12:11 ` Mathias Nyman
2020-03-04 14:12 ` Oliver Neukum [this message]
2020-03-04 16:21 ` Mathias Nyman
2020-03-06 1:31 ` Peter Chen
2020-03-09 14:21 ` Jonas Karlsson
2020-03-10 8:14 ` Peter Chen
2020-03-10 10:04 ` Jonas Karlsson
2020-03-10 11:04 ` Oliver Neukum
2020-03-10 11:21 ` Oliver Neukum
2020-03-10 12:26 ` Jonas Karlsson
2020-03-10 16:04 ` Jonas Karlsson
2020-03-10 16:11 ` Fabio Estevam
2020-03-11 6:25 ` Jonas Karlsson
2020-03-11 10:28 ` Oliver Neukum
2020-03-11 14:59 ` Jonas Karlsson
2020-03-12 13:45 ` Oliver Neukum
2020-03-12 15:37 ` Jonas Karlsson
2020-03-13 9:27 ` Oliver Neukum
2020-03-16 7:07 ` Jonas Karlsson
2020-03-23 11:37 ` Jonas Karlsson
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