linux-kernel - Re: [v4l-dvb-maintainer] [patch] fix warning in drivers/media/dvb/dvb-usb/af9005-fe.c

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Date:	Sat, 27 Dec 2008 15:24:34 -0500
From:	Andy Walls <awalls@...ix.net>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Mauro Carvalho Chehab <mchehab@...hat.com>,
	linux-dvb-maintainer@...uxtv.org, video4linux-list@...hat.com,
	linux-kernel@...r.kernel.org,
	Patrick Boettcher <patrick.boettcher@...y.de>
Subject: Re: [v4l-dvb-maintainer] [patch] fix warning in
	drivers/media/dvb/dvb-usb/af9005-fe.c

On Sat, 2008-12-27 at 13:00 +0100, Ingo Molnar wrote:
> * Ingo Molnar <mingo@...e.hu> wrote:
> 
> Btw., there's a handful of warning fixes i carry in tip/warnings/* topic 
> branches - you can find them in tip/master via:
> 
>   http://people.redhat.com/mingo/tip.git/README
> 
> the ones affecting drivers/media/ are:
> 
>   f3e67e2: fix warning in drivers/media/video/usbvision/usbvision-i2c.c
>   491af31: fix warning in drivers/media/video/cx18/cx18-mailbox.c

Mauro & Ingo,

If the cx18 warning message is fixed in the following diff, that I
culled from a LKML posting by Ingo on 29 Nov, then Ingo's patch for
cx18-mailbox.c should be overcome by events in the latest v4l-dvb repo.
"req" is now always assigned a value before it is ever used.  (Sorry, I
didn't want to pull the > 100 MB git/tip down over my dialup connection
to verify this was the item in question).


diff --git a/drivers/media/video/cx18/cx18-mailbox.c b/drivers/media/video/cx18/cx18-mailbox.c
index acff7df..5c847be 100644
--- a/drivers/media/video/cx18/cx18-mailbox.c
+++ b/drivers/media/video/cx18/cx18-mailbox.c
@@ -184,7 +184,7 @@ long cx18_mb_ack(struct cx18 *cx, const struct cx18_mailbox *mb)
 static int cx18_api_call(struct cx18 *cx, u32 cmd, int args, u32 data[])
 {
 	const struct cx18_api_info *info = find_api_info(cmd);
-	u32 state = 0, irq = 0, req, oldreq, err;
+	u32 state = 0, irq = 0, uninitialized_var(req), oldreq, err;
 	struct cx18_mailbox __iomem *mb;
 	wait_queue_head_t *waitq;
 	int timeout = 100;



>   728342a: fix warnings in drivers/media/dvb/ttusb-dec/ttusb_dec.c
>   4dda565: fix warning in drivers/media/dvb/frontends/drx397xD.c
>   a2e4f4a: fix warning in drivers/media/common/tuners/mxl5007t.c
>   8317adf: fix warning in drivers/media/dvb/dvb-usb/anysee.c
> 
> this one appears to be GCC warning about a real bug:
> 
>   8317adf: fix warning in drivers/media/dvb/dvb-usb/anysee.c
> 
> the others are fixes for false positives - i reviewed the affected code 
> paths and each commit log includes the analysis about why it is a false 
> positive.

> Please have a look and git-cherry-pick the above commits if they are still 
> relevant to your tree and if you agree with them. Thanks,
> 
> 	Ingo

Regards,
Andy

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