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Message-ID: <202210191908.y4HrAurF-lkp@intel.com>
Date: Wed, 19 Oct 2022 23:16:06 +0800
From: kernel test robot <lkp@...el.com>
To: Hans Verkuil <hverkuil@...all.nl>
Cc: llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
linux-kernel@...r.kernel.org,
Mauro Carvalho Chehab <mchehab@...nel.org>,
linux-media@...r.kernel.org
Subject: drivers/staging/media/deprecated/cpia2/cpia2_usb.c:80:13: warning:
variable 'frame_count' set but not used
Hi Hans,
First bad commit (maybe != root cause):
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: aae703b02f92bde9264366c545e87cec451de471
commit: be8cebc46d9d38166a1b3fda22a018ae52b0928e media: cpia2: deprecate this driver
date: 7 weeks ago
config: arm64-allmodconfig
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 791a7ae1ba3efd6bca96338e10ffde557ba83920)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install arm64 cross compiling tool for clang build
# apt-get install binutils-aarch64-linux-gnu
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=be8cebc46d9d38166a1b3fda22a018ae52b0928e
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout be8cebc46d9d38166a1b3fda22a018ae52b0928e
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash drivers/gpu/drm/amd/amdgpu/ drivers/staging/media/deprecated/cpia2/
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>
All warnings (new ones prefixed by >>):
>> drivers/staging/media/deprecated/cpia2/cpia2_usb.c:80:13: warning: variable 'frame_count' set but not used [-Wunused-but-set-variable]
static int frame_count;
^
1 warning generated.
vim +/frame_count +80 drivers/staging/media/deprecated/cpia2/cpia2_usb.c
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 71
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 72
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 73 /******************************************************************************
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 74 *
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 75 * process_frame
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 76 *
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 77 *****************************************************************************/
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 78 static void process_frame(struct camera_data *cam)
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 79 {
ff699e6bd02eb1 drivers/media/video/cpia2/cpia2_usb.c Douglas Schilling Landgraf 2008-04-22 @80 static int frame_count;
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 81
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 82 unsigned char *inbuff = cam->workbuff->data;
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 83
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 84 DBG("Processing frame #%d, current:%d\n",
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 85 cam->workbuff->num, cam->curbuff->num);
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 86
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 87 if(cam->workbuff->length > cam->workbuff->max_length)
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 88 cam->workbuff->max_length = cam->workbuff->length;
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 89
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 90 if ((inbuff[0] == 0xFF) && (inbuff[1] == 0xD8)) {
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 91 frame_count++;
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 92 } else {
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 93 cam->workbuff->status = FRAME_ERROR;
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 94 DBG("Start of frame not found\n");
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 95 return;
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 96 }
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 97
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 98 /***
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 99 * Now the output buffer should have a JPEG image in it.
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 100 ***/
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 101 if(!cam->first_image_seen) {
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 102 /* Always skip the first image after streaming
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 103 * starts. It is almost certainly corrupt. */
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 104 cam->first_image_seen = 1;
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 105 cam->workbuff->status = FRAME_EMPTY;
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 106 return;
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 107 }
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 108 if (cam->workbuff->length > 3) {
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 109 if(cam->mmapped &&
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 110 cam->workbuff->length < cam->workbuff->max_length) {
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 111 /* No junk in the buffers */
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 112 memset(cam->workbuff->data+cam->workbuff->length,
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 113 0, cam->workbuff->max_length-
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 114 cam->workbuff->length);
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 115 }
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 116 cam->workbuff->max_length = cam->workbuff->length;
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 117 cam->workbuff->status = FRAME_READY;
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 118
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 119 if(!cam->mmapped && cam->num_frames > 2) {
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 120 /* During normal reading, the most recent
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 121 * frame will be read. If the current frame
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 122 * hasn't started reading yet, it will never
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 123 * be read, so mark it empty. If the buffer is
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 124 * mmapped, or we have few buffers, we need to
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 125 * wait for the user to free the buffer.
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 126 *
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 127 * NOTE: This is not entirely foolproof with 3
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 128 * buffers, but it would take an EXTREMELY
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 129 * overloaded system to cause problems (possible
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 130 * image data corruption). Basically, it would
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 131 * need to take more time to execute cpia2_read
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 132 * than it would for the camera to send
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 133 * cam->num_frames-2 frames before problems
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 134 * could occur.
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 135 */
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 136 cam->curbuff->status = FRAME_EMPTY;
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 137 }
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 138 cam->curbuff = cam->workbuff;
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 139 cam->workbuff = cam->workbuff->next;
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 140 DBG("Changed buffers, work:%d, current:%d\n",
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 141 cam->workbuff->num, cam->curbuff->num);
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 142 return;
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 143 } else {
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 144 DBG("Not enough data for an image.\n");
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 145 }
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 146
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 147 cam->workbuff->status = FRAME_ERROR;
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 148 return;
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 149 }
ab33d5071de7a3 drivers/media/video/cpia2/cpia2_usb.c Alan Cox 2006-02-27 150
:::::: The code at line 80 was first introduced by commit
:::::: ff699e6bd02eb1c6d02c7c2b576c2ee6caab201c V4L/DVB (7094): static memory
:::::: TO: Douglas Schilling Landgraf <dougsland@...il.com>
:::::: CC: Mauro Carvalho Chehab <mchehab@...radead.org>
--
0-DAY CI Kernel Test Service
https://01.org/lkp
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