linux-kernel - Re: [PATCH] video: bfin_adv7393fb: Fix cleanup code

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Message-ID: <20120528152601.GE4637@mwanda>
Date:	Mon, 28 May 2012 18:26:01 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Emil Goode <emilgoode@...il.com>
Cc:	FlorianSchandinat@....de, linux-fbdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] video: bfin_adv7393fb: Fix cleanup code

On Mon, May 28, 2012 at 04:40:19PM +0200, Emil Goode wrote:
> This patch fixes the cleanup code of the bfin_adv7393_fb_probe
> function by changing the order in which cleanup is performed
> and by adding one label.
> 

Could you list the actual bugs which were fixed:

1) The resources were not freed in the order that we allocated them
   so we call dma_free_coherent() before it was allocated.
2) The labels weren't in the right place which also meant that we
   freed resources that weren't allocated.
3) We should free gpio_free(P_IDENT(P_PPI0_FS3)) before returning.

The new gpio_free() is more important than the added label.

Since you're changing all these, you may as well fix the label names
as well.  The out_9 style labels suck.  The right way is to give
them meaningful labels instead of GW-BASIC style labels.

Labels should be named after what happens when you arrive.  Some
people name them after the start of the journey but that's a
mistake.  It's just like the town of Chicago is still called Chicago
even though you might goto Chicago starting from Boston.  Like this:

err_ppi:
	free_dma(CH_PPI);
	fb_dealloc_cmap(&fbdev->info.cmap);
err_palette:
	kfree(fbdev->info.pseudo_palette);

regards,
dan carpenter
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