From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mout.web.de ([212.227.15.3]:64197 "EHLO mout.web.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753068AbcKWSY2 (ORCPT ); Wed, 23 Nov 2016 13:24:28 -0500 Subject: Re: [PATCH] [media] DaVinci-VPFE-Capture: fix error handling To: Arnd Bergmann References: <20161122205231.799066-1-arnd@arndb.de> Cc: "Lad, Prabhakar" , Mauro Carvalho Chehab , Hans Verkuil , linux-media@vger.kernel.org, linux-kernel@vger.kernel.org From: SF Markus Elfring Message-ID: Date: Wed, 23 Nov 2016 19:24:11 +0100 MIME-Version: 1.0 In-Reply-To: <20161122205231.799066-1-arnd@arndb.de> Content-Type: text/plain; charset=iso-8859-15 Content-Transfer-Encoding: 7bit Sender: linux-media-owner@vger.kernel.org List-ID: > A recent cleanup had the right idea to remove the initialization > of the error variable, but missed the actual benefit of that, > which is that we get warnings if there is a bug in it. > Now we get a warning about a bug that was introduced by this cleanup: > > drivers/media/platform/davinci/vpfe_capture.c: In function 'vpfe_probe': > drivers/media/platform/davinci/vpfe_capture.c:1992:9: error: 'ret' may be used uninitialized in this function [-Werror=maybe-uninitialized] Thanks for your information. > This adds the missing initialization that the warning is about, I have got the impression that an other wording would be more appropriate. > and another one that was preexisting and that we did not get > a warning for. That second bug has existed since the driver > was first added. Do you distinguish better between the setting for two return values because of either a memory allocation failure and a failed call of the function "v4l2_i2c_new_subdev_board" here? > Fixes: efb74461f5a6 ("[media] DaVinci-VPFE-Capture: Delete an unnecessary variable initialisation in vpfe_probe()") > Fixes: 7da8a6cb3e5b ("V4L/DVB (12248): v4l: vpfe capture bridge driver for DM355 and DM6446") > Signed-off-by: Arnd Bergmann > --- > drivers/media/platform/davinci/vpfe_capture.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > diff --git a/drivers/media/platform/davinci/vpfe_capture.c b/drivers/media/platform/davinci/vpfe_capture.c > index 6c41782b3ba0..ee1cd79739c8 100644 > --- a/drivers/media/platform/davinci/vpfe_capture.c > +++ b/drivers/media/platform/davinci/vpfe_capture.c > @@ -1847,8 +1847,10 @@ static int vpfe_probe(struct platform_device *pdev) > > /* Allocate memory for ccdc configuration */ > ccdc_cfg = kmalloc(sizeof(*ccdc_cfg), GFP_KERNEL); > - if (!ccdc_cfg) > + if (!ccdc_cfg) { > + ret = -ENOMEM; > goto probe_free_dev_mem; > + } > > mutex_lock(&ccdc_lock); > > @@ -1964,6 +1966,7 @@ static int vpfe_probe(struct platform_device *pdev) > v4l2_info(&vpfe_dev->v4l2_dev, > "v4l2 sub device %s register fails\n", > sdinfo->name); > + ret = -ENXIO; > goto probe_sd_out; > } > } > Thanks for your source code correction. Regards, Markus