linux-kernel - Re: [PATCH] staging: rtl8723au: Fix Sparse errors in rtl8723a

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Date:	Sun, 4 Oct 2015 15:26:18 -0400
From:	Jacob Kiefer <jtk54@...nell.edu>
To:	Larry Finger <Larry.Finger@...inger.net>,
	Jes Sorensen <Jes.Sorensen@...hat.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Gujulan Elango, Hari Prasath (H.)" <hgujulan@...teon.com>,
	Roberta Dobrescu <roberta.dobrescu@...il.com>,
	"open list:STAGING - REALTEK RTL8723U WIRELESS DRIVER" 
	<linux-wireless@...r.kernel.org>,
	"open list:STAGING SUBSYSTEM" <devel@...verdev.osuosl.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] staging: rtl8723au: Fix Sparse errors in rtl8723a_cmd.c

Hi Greg,

Thanks for the response! It's always good to get notes on a patch.
Some responses to your points:

> Why __le32?  Does this variable go across the user/kernel boundry
> somehow?  If not, just use le32.

Good point, this should probably have been le32.

> At first glance, you aren't doing ths same logic in this function as the
> original did, please look at this very closely again and verify that you
> are doing this correctly.
>
> Don't just blindly quiet tools like sparse, it is warning for a reason,
> but be careful about your fix.

On a second, closer look at the code I am not doing this correctly: the
buffer I am converting to le32 needs to persist (which a local variable
would not). On my first glance at this code I saw the same buffer being
used for both little- and big-endian storage of the same data -- it's
correct, but a little ugly.

I am going to leave this code as is, since it was functioning properly
before my patch.

Thanks,
Jake
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