linux-kernel - Re: [PATCH v16 2/2] drm/bridge: anx7625: Add anx7625 MIPI DSI/DPI to DP

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Date:   Fri, 18 Sep 2020 18:06:17 +0800
From:   Xin Ji <xji@...logixsemi.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     devel@...verdev.osuosl.org,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Nicolas Boichat <drinkcat@...gle.com>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        Pi-Hsun Shih <pihsun@...omium.org>,
        Sheng Pan <span@...logixsemi.com>
Subject: Re: [PATCH v16 2/2] drm/bridge: anx7625: Add anx7625 MIPI DSI/DPI to
 DP

On Fri, Sep 18, 2020 at 11:45:34AM +0300, Dan Carpenter wrote:
> Hi Xin,
> 
> url:    https://github.com/0day-ci/linux/commits/Xin-Ji/Add-initial-support-for-slimport-anx7625/20200917-163238
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 5925fa68fe8244651b3f78a88c4af99190a88f0d
> config: mips-randconfig-m031-20200917 (attached as .config)
> compiler: mips-linux-gcc (GCC) 9.3.0
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
> Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Hi Dan, OK, I'll fix it right now.
Thanks,
Xin
> 
> smatch warnings:
> drivers/gpu/drm/bridge/analogix/anx7625.c:1289 anx7625_get_edid() warn: possible memory leak of 'edid'
> 
> # https://github.com/0day-ci/linux/commit/667ee517c70d2bedafe5bfa0dc5f13fc60d5133d
> git remote add linux-review https://github.com/0day-ci/linux
> git fetch --no-tags linux-review Xin-Ji/Add-initial-support-for-slimport-anx7625/20200917-163238
> git checkout 667ee517c70d2bedafe5bfa0dc5f13fc60d5133d
> vim +/edid +1289 drivers/gpu/drm/bridge/analogix/anx7625.c
> 
> 667ee517c70d2be Xin Ji 2020-09-17  1264  static struct edid *anx7625_get_edid(struct anx7625_data *ctx)
> 667ee517c70d2be Xin Ji 2020-09-17  1265  {
> 667ee517c70d2be Xin Ji 2020-09-17  1266  	struct device *dev = &ctx->client->dev;
> 667ee517c70d2be Xin Ji 2020-09-17  1267  	struct s_edid_data *p_edid = &ctx->slimport_edid_p;
> 667ee517c70d2be Xin Ji 2020-09-17  1268  	int edid_num;
> 667ee517c70d2be Xin Ji 2020-09-17  1269  	u8 *edid;
> 667ee517c70d2be Xin Ji 2020-09-17  1270  
> 667ee517c70d2be Xin Ji 2020-09-17  1271  	edid = kmalloc(FOUR_BLOCK_SIZE, GFP_KERNEL);
> 667ee517c70d2be Xin Ji 2020-09-17  1272  	if (!edid) {
> 667ee517c70d2be Xin Ji 2020-09-17  1273  		DRM_DEV_ERROR(dev, "Fail to allocate buffer\n");
> 667ee517c70d2be Xin Ji 2020-09-17  1274  		return NULL;
> 667ee517c70d2be Xin Ji 2020-09-17  1275  	}
> 667ee517c70d2be Xin Ji 2020-09-17  1276  
> 667ee517c70d2be Xin Ji 2020-09-17  1277  	if (ctx->slimport_edid_p.edid_block_num > 0) {
> 667ee517c70d2be Xin Ji 2020-09-17  1278  		memcpy(edid, ctx->slimport_edid_p.edid_raw_data,
> 667ee517c70d2be Xin Ji 2020-09-17  1279  		       FOUR_BLOCK_SIZE);
> 667ee517c70d2be Xin Ji 2020-09-17  1280  		return (struct edid *)edid;
> 667ee517c70d2be Xin Ji 2020-09-17  1281  	}
> 667ee517c70d2be Xin Ji 2020-09-17  1282  
> 667ee517c70d2be Xin Ji 2020-09-17  1283  	anx7625_low_power_mode_check(ctx, 1);
> 667ee517c70d2be Xin Ji 2020-09-17  1284  	edid_num = sp_tx_edid_read(ctx, p_edid->edid_raw_data);
> 667ee517c70d2be Xin Ji 2020-09-17  1285  	anx7625_low_power_mode_check(ctx, 0);
> 667ee517c70d2be Xin Ji 2020-09-17  1286  
> 667ee517c70d2be Xin Ji 2020-09-17  1287  	if (edid_num < 1) {
> 667ee517c70d2be Xin Ji 2020-09-17  1288  		DRM_DEV_ERROR(dev, "Fail to read EDID: %d\n", edid_num);
> 667ee517c70d2be Xin Ji 2020-09-17 @1289  		return NULL;
> 
> kfree(edid); before returning.
> 
> 667ee517c70d2be Xin Ji 2020-09-17  1290  	}
> 667ee517c70d2be Xin Ji 2020-09-17  1291  
> 667ee517c70d2be Xin Ji 2020-09-17  1292  	p_edid->edid_block_num = edid_num;
> 667ee517c70d2be Xin Ji 2020-09-17  1293  
> 667ee517c70d2be Xin Ji 2020-09-17  1294  	memcpy(edid, ctx->slimport_edid_p.edid_raw_data, FOUR_BLOCK_SIZE);
> 667ee517c70d2be Xin Ji 2020-09-17  1295  	return (struct edid *)edid;
> 667ee517c70d2be Xin Ji 2020-09-17  1296  }
> 
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org