linux-kernel - Re: [PATCH] rate limit drm:radeon_cp

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Date:	Mon, 8 Sep 2008 21:08:36 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Roberto Oppedisano <roppedisano@...racomspa.it>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	dri-devel@...ts.sourceforge.net, Dave Airlie <airlied@...ux.ie>
Subject: Re: [PATCH] rate limit drm:radeon_cp_idle/reset errors

On Sat, 6 Sep 2008 11:19:19 +0200 Roberto Oppedisano <roppedisano@...racomspa.it> wrote:

> When switching from kwin composite wm (KDE 4.1) to compiz I often hit the
> following error:
> 
> Sep  6 10:24:31 poppero1 kernel: [  186.138203] [drm:radeon_cp_idle] *ERROR* radeon_cp_idle called without lock held, held  0 owner f726bc80 f68f6840
> Sep  6 10:24:31 poppero1 kernel: [  186.138568] [drm:radeon_cp_reset] *ERROR* radeon_cp_reset called without lock held, held  0 owner f726bc80 f68f6840
> 
> probably due to broken X drivers/apps; after hitting this the error my laptop
> (hp nx7010) is totally unresponsitive to keyboard/mouse, also if it can be 
> shut down via the power button:
> 
> Sep  6 10:24:59 poppero1 powersave-wm_shutdown[4843]: DIAG: Process script for event button.power ID 10
> Sep  6 10:24:59 poppero1 powersave-wm_shutdown[4843]: INFO: Event: BUTTON_POWER occured.
> Sep  6 10:24:59 poppero1 powersave-wm_shutdown[4843]: INFO: Parameters: Event - button.power; Current Active Scheme: scheme_performance - ACPI event line: button/power PWRF 00000080
> 00000001
> Sep  6 10:25:00 poppero1 shutdown[4852]: shutting down for system halt
> ...
> 
> Without the attached patch, which rate limits DRM_ERROR, the syslog is flooded
> by thuosands of messages; here's the output with the patch applied.
> 
> Sep  6 10:24:31 poppero1 kernel: [  186.138774] [drm:radeon_cp_start] *ERROR* radeon_cp_start called without lock held, held  0 owner f726bc80 f68f6840
> Sep  6 10:24:31 poppero1 kernel: [  186.138968] [drm:radeon_cp_idle] *ERROR* radeon_cp_idle called without lock held, held  0 owner f726bc80 f68f6840
> Sep  6 10:24:31 poppero1 kernel: [  186.139214] [drm:radeon_cp_reset] *ERROR* radeon_cp_reset called without lock held, held  0 owner f726bc80 f68f6840
> Sep  6 10:24:31 poppero1 kernel: [  186.139408] [drm:radeon_cp_start] *ERROR* radeon_cp_start called without lock held, held  0 owner f726bc80 f68f6840
> Sep  6 10:24:31 poppero1 kernel: [  186.139601] [drm:radeon_cp_idle] *ERROR* radeon_cp_idle called without lock held, held  0 owner f726bc80 f68f6840
> Sep  6 10:24:31 poppero1 kernel: [  186.139866] [drm:radeon_cp_reset] *ERROR* radeon_cp_reset called without lock held, held  0 owner f726bc80 f68f6840
> Sep  6 10:24:31 poppero1 kernel: [  186.140072] [drm:radeon_cp_start] *ERROR* radeon_cp_start called without lock held, held  0 owner f726bc80 f68f6840
> Sep  6 10:24:31 poppero1 kernel: [  186.140467] [drm:radeon_cp_idle] *ERROR* radeon_cp_idle called without lock held, held  0 owner f726bc80 f68f6840
> Sep  6 10:24:36 poppero1 kernel: [  191.139019] __ratelimit: 253431 callbacks suppressed
> Sep  6 10:24:36 poppero1 kernel: [  191.139030] [drm:radeon_cp_reset] *ERROR* radeon_cp_reset called without lock held, held  0 owner f726bc80 f68f6840
> Sep  6 10:24:36 poppero1 kernel: [  191.139314] [drm:radeon_cp_start] *ERROR* radeon_cp_start called without lock held, held  0 owner f726bc80 f68f6840
> 
> Also if it doesn't solve a bug I think it may still be worth applying it. 
> Patch is against current git.
> 
> Signed-off-by: Roberto Oppedisano <roberto.oppedisano@...racom.it>
> 
> diff --git a/include/drm/drmP.h b/include/drm/drmP.h
> index 1c1b13e..1107361 100644
> --- a/include/drm/drmP.h
> +++ b/include/drm/drmP.h
> @@ -162,7 +162,8 @@ struct drm_device;
>   * \param arg arguments
>   */
>  #define DRM_ERROR(fmt, arg...) \
> -	printk(KERN_ERR "[" DRM_NAME ":%s] *ERROR* " fmt , __func__ , ##arg)
> +	if (printk_ratelimit()) \
> +		printk(KERN_ERR "[" DRM_NAME ":%s] *ERROR* " fmt , __func__ , ##arg)
>  
>  /**
>   * Memory error output.
> 

Which kernel version(s)?
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