linux-kernel - Re: [PATCH 1/1] HID: fix tty<->hid deadlock

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Message-ID: <3717.1220573006@turing-police.cc.vt.edu>
Date:	Thu, 04 Sep 2008 20:03:26 -0400
From:	Valdis.Kletnieks@...edu
To:	Jiri Slaby <jirislaby@...il.com>
Cc:	Alan Cox <alan@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] HID: fix tty<->hid deadlock

On Thu, 04 Sep 2008 17:16:07 +0200, Jiri Slaby said:

> hid_compat_load() runs on the default workqueue, it request_module(), it
> execs modprobe, it exits, tty flushes default workqueue, it hangs, because
> we are still in it.
> 
> I haven't run into it since there always was at least one opener of the tty,
> I guess. Could you try the patch below?
> 
> --
> 
> Signed-off-by: Jiri Slaby <jirislaby@...il.com>
> ---
>  drivers/hid/hid-core.c |   11 ++++++++++-
>  1 files changed, 10 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
> index 92c16e1..18d952a 100644
> --- a/drivers/hid/hid-core.c
> +++ b/drivers/hid/hid-core.c

With this patch applied, the kernel behaves as expected for my config: it
requests a 'modprobe hid_dummy', which prints a nasty message about being
unable to find it on the initrd, and then we continue with the boot.

Thanks for the quick fix...

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