linux-kernel - Re: aic94xx: maybe uninitialized variable in asd_process_ctrl_a

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Date:	Fri, 11 Apr 2014 10:19:09 +0200
From:	Paul Bolle <pebolle@...cali.nl>
To:	Filipe Brandenburger <filbranden@...gle.com>
Cc:	"James E.J. Bottomley" <JBottomley@...allels.com>,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Michel Lespinasse <walken@...gle.com>
Subject: Re: aic94xx: maybe uninitialized variable in asd_process_ctrl_a_user

On Thu, 2014-04-10 at 22:13 -0700, Filipe Brandenburger wrote:
> While building a recent kernel with -Werror I found this warning:
> 
> drivers/scsi/aic94xx/aic94xx_sds.c: In function 'asd_read_flash':
> drivers/scsi/aic94xx/aic94xx_sds.c:597:21: error: 'offs' may be used
> uninitialized in this function [-Werror=maybe-uninitialized]
> drivers/scsi/aic94xx/aic94xx_sds.c:985:6: note: 'offs' was declared here

This warning is actually rather old.

> This looks like a valid complaint from the compiler, since in
> asd_process_ctrl_a_user if the call to asd_find_flash_de fails (and
> returns -ENOENT) then offs will not be set, but that will not prevent
> the variable to be later passed to the call to asd_read_flash_seg
> later in that same function.
> 
> Would you please have a look at it? Let me know if there's a more
> appropriate way to report these issues (e.g. bug tracker.)

I tried a few times to fix this warning.

In the end I just asked Fedora to disable aic94xx in their kernel builds
(which they did for Rawhide, their development branch). See
https://lists.fedoraproject.org/pipermail/kernel/2014-January/004759.html for all the boring details.


Paul Bolle

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