linux-kernel - Re: [PATCH] HID: wake up reading tasks when debug event occurs

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Message-ID: <alpine.LNX.2.00.1009081202290.26813@pobox.suse.cz>
Date:	Wed, 8 Sep 2010 12:03:17 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Chase Douglas <chase.douglas@...onical.com>
Cc:	H Hartley Sweeten <hsweeten@...ionengravers.com>,
	Julia Lawall <julia@...u.dk>, Dmitry Torokhov <dtor@...l.ru>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] HID: wake up reading tasks when debug event occurs

On Mon, 30 Aug 2010, Chase Douglas wrote:

> From: Chase Douglas <chase.douglas@...ntu.com>
> 
> Some devices poke the hid core in a way that causes hid_debug_event to
> be called, while never calling hid_dump_input. Without this wakeup
> addition, tasks reading for hid events through debugfs may never see any
> events. It may be that a well written driver doesn't cause this, but
> then what's the point of debugfs?

Well the main reason for the debugfs interface has been to debug strange 
devices. But your fix is a clear improvement for pathological cases, which 
is OK for debugging interface.

Applied, thanks.

> 
> Signed-off-by: Chase Douglas <chase.douglas@...onical.com>
> ---
>  drivers/hid/hid-debug.c |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/hid/hid-debug.c b/drivers/hid/hid-debug.c
> index 850d02a..adff4ef 100644
> --- a/drivers/hid/hid-debug.c
> +++ b/drivers/hid/hid-debug.c
> @@ -570,6 +570,8 @@ void hid_debug_event(struct hid_device *hdev, char *buf)
>  				buf[i];
>  		list->tail = (list->tail + i) % HID_DEBUG_BUFSIZE;
>          }
> +
> +	wake_up_interruptible(&hdev->debug_wait);
>  }
>  EXPORT_SYMBOL_GPL(hid_debug_event);
>  
> -- 
> 1.7.1
> 

-- 
Jiri Kosina
SUSE Labs, Novell Inc.
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