All of lore.kernel.org
 help / color / mirror / Atom feed
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Ferry Toth <ftoth@exalondelft.nl>
Cc: Ruslan Bilovol <ruslan.bilovol@gmail.com>,
	Jerome Brunet <jbrunet@baylibre.com>,
	Jonathan Corbet <corbet@lwn.net>,
	Mauro Carvalho Chehab <mchehab+huawei@kernel.org>,
	Pawel Laszczak <pawell@cadence.com>,
	Felipe Balbi <balbi@kernel.org>, Jack Pham <jackp@codeaurora.org>,
	linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org,
	linux-doc@vger.kernel.org, Lorenzo Colitti <lorenzo@google.com>,
	Wesley Cheng <wcheng@codeaurora.org>,
	robh+dt@kernel.org, agross@kernel.org,
	bjorn.andersson@linaro.org, frowand.list@gmail.com,
	devicetree@vger.kernel.org, linux-arm-msm@vger.kernel.org,
	heikki.krogerus@linux.intel.com,
	Thinh Nguyen <Thinh.Nguyen@synopsys.com>,
	Andy Shevchenko <andy.shevchenko@gmail.com>,
	Pavel Hofman <pavel.hofman@ivitera.com>
Subject: Re: [PATCH v2 1/3] Revert "usb: gadget: u_audio: add real feedback implementation"
Date: Fri, 27 Aug 2021 10:29:02 +0200	[thread overview]
Message-ID: <YSiiTrW/ZF2PyGWd@kroah.com> (raw)
In-Reply-To: <20210826185739.3868-2-ftoth@exalondelft.nl>

On Thu, Aug 26, 2021 at 08:57:37PM +0200, Ferry Toth wrote:
> This reverts commit e89bb4288378b85c82212b60dc98ecda6b3d3a70.
> 
> The commit is part of a series with commit
> 24f779dac8f3efb9629adc0e486914d93dc45517 causing a BUG on dwc3
> hardware, at least on Intel Merrifield platform when configured
> through configfs:
> BUG: kernel NULL pointer dereference, address: 0000000000000008
> ...
> RIP: 0010:dwc3_gadget_del_and_unmap_request+0x19/0xe0
> ...
> Call Trace:
>  dwc3_remove_requests.constprop.0+0x12f/0x170
>  __dwc3_gadget_ep_disable+0x7a/0x160
>  dwc3_gadget_ep_disable+0x3d/0xd0
>  usb_ep_disable+0x1c/0x70
>  u_audio_stop_capture+0x79/0x120 [u_audio]
>  afunc_set_alt+0x73/0x80 [usb_f_uac2]
>  composite_setup+0x224/0x1b90 [libcomposite]
> 
> Pavel's suggestion to add
> `echo "adaptive" > functions/uac2.usb0/c_sync` to the configfs script
> resolves the issue.
> Thinh suggests "the crash is probably because of f_uac2 prematurely
> freeing feedback request before its completion. usb_ep_dequeue() is
> asynchronous. dwc2() may treat it as a synchronous call so you didn't
> get a crash."
> 
> Revert as this is a regression and the kernel shouldn't crash depending
> on configuration parameters.

Are these normal configuration options in the wild, or is this just
something that you "can do"?

> Signed-off-by: Ferry Toth <ftoth@exalondelft.nl>

I need an ack from the original authors to revert all this...

thanks,

greg k-h

  reply	other threads:[~2021-08-27  8:29 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-26 18:57 [PATCH v2 0/3] Revert "usb: gadget: u_audio: add real feedback implementation" Ferry Toth
2021-08-26 18:57 ` [PATCH v2 1/3] " Ferry Toth
2021-08-27  8:29   ` Greg Kroah-Hartman [this message]
2021-08-27 20:41     ` Ferry Toth
2021-08-26 18:57 ` [PATCH v2 2/3] Revert "usb: gadget: f_uac2: add adaptive sync support for capture" Ferry Toth
2021-08-26 18:57 ` [PATCH v2 3/3] Revert "usb: gadget: f_uac2/u_audio: add feedback endpoint support" Ferry Toth
2021-08-27  7:59 ` [PATCH v2 0/3] Revert "usb: gadget: u_audio: add real feedback implementation" Jerome Brunet
2021-08-27  9:15   ` Andy Shevchenko
2021-08-27 20:44     ` Ferry Toth
2021-08-27  8:27 ` Greg Kroah-Hartman
2021-08-27 20:49   ` Ferry Toth

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=YSiiTrW/ZF2PyGWd@kroah.com \
    --to=gregkh@linuxfoundation.org \
    --cc=Thinh.Nguyen@synopsys.com \
    --cc=agross@kernel.org \
    --cc=andy.shevchenko@gmail.com \
    --cc=balbi@kernel.org \
    --cc=bjorn.andersson@linaro.org \
    --cc=corbet@lwn.net \
    --cc=devicetree@vger.kernel.org \
    --cc=frowand.list@gmail.com \
    --cc=ftoth@exalondelft.nl \
    --cc=heikki.krogerus@linux.intel.com \
    --cc=jackp@codeaurora.org \
    --cc=jbrunet@baylibre.com \
    --cc=linux-arm-msm@vger.kernel.org \
    --cc=linux-doc@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-usb@vger.kernel.org \
    --cc=lorenzo@google.com \
    --cc=mchehab+huawei@kernel.org \
    --cc=pavel.hofman@ivitera.com \
    --cc=pawell@cadence.com \
    --cc=robh+dt@kernel.org \
    --cc=ruslan.bilovol@gmail.com \
    --cc=wcheng@codeaurora.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.