[linux-next:master 4131/8410] drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_stateless.c:133:18: warning: Value stored to 'pfb' during its initialization is never read [clang-analyzer-deadcode.DeadStores]

[kernel test robot <yujie.liu@intel.com>]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   7c832d2f9b959e3181370c8b0dacaf9efe13fc05
commit: 8cdc3794b2e34b3ee11ddfccf4af3f64344a1a75 [4131/8410] media: mtk-vcodec: vdec: support stateless API
config: riscv-randconfig-c006-20211017 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 8ca4b3ef19fe82d7ad6a6e1515317dcc01b41515)
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 riscv cross compiling tool for clang build
         # apt-get install binutils-riscv64-linux-gnu
         # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=8cdc3794b2e34b3ee11ddfccf4af3f64344a1a75
         git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
         git fetch --no-tags linux-next master
         git checkout 8cdc3794b2e34b3ee11ddfccf4af3f64344a1a75
         # save the attached .config to linux build tree
         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=riscv clang-analyzer

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>


clang-analyzer warnings: (new ones prefixed by >>)

 >> drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_stateless.c:133:18: warning: Value stored to 'pfb' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
            struct vdec_fb *pfb = &framebuf->frame_buffer;
                            ^~~   ~~~~~~~~~~~~~~~~~~~~~~~


vim +/pfb +133 drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_stateless.c

8cdc3794b2e34b Yunfei Dong 2021-08-06  127
8cdc3794b2e34b Yunfei Dong 2021-08-06  128  static struct vdec_fb *vdec_get_cap_buffer(struct mtk_vcodec_ctx *ctx,
8cdc3794b2e34b Yunfei Dong 2021-08-06  129  					   struct vb2_v4l2_buffer *vb2_v4l2)
8cdc3794b2e34b Yunfei Dong 2021-08-06  130  {
8cdc3794b2e34b Yunfei Dong 2021-08-06  131  	struct mtk_video_dec_buf *framebuf =
8cdc3794b2e34b Yunfei Dong 2021-08-06  132  		container_of(vb2_v4l2, struct mtk_video_dec_buf, m2m_buf.vb);
8cdc3794b2e34b Yunfei Dong 2021-08-06 @133  	struct vdec_fb *pfb = &framebuf->frame_buffer;
8cdc3794b2e34b Yunfei Dong 2021-08-06  134  	struct vb2_buffer *dst_buf = &vb2_v4l2->vb2_buf;
8cdc3794b2e34b Yunfei Dong 2021-08-06  135
8cdc3794b2e34b Yunfei Dong 2021-08-06 @136  	pfb = &framebuf->frame_buffer;
8cdc3794b2e34b Yunfei Dong 2021-08-06  137  	pfb->base_y.va = NULL;
8cdc3794b2e34b Yunfei Dong 2021-08-06  138  	pfb->base_y.dma_addr = vb2_dma_contig_plane_dma_addr(dst_buf, 0);
8cdc3794b2e34b Yunfei Dong 2021-08-06  139  	pfb->base_y.size = ctx->q_data[MTK_Q_DATA_DST].sizeimage[0];
8cdc3794b2e34b Yunfei Dong 2021-08-06  140
8cdc3794b2e34b Yunfei Dong 2021-08-06  141  	if (ctx->q_data[MTK_Q_DATA_DST].fmt->num_planes == 2) {
8cdc3794b2e34b Yunfei Dong 2021-08-06  142  		pfb->base_c.va = NULL;
8cdc3794b2e34b Yunfei Dong 2021-08-06  143  		pfb->base_c.dma_addr =
8cdc3794b2e34b Yunfei Dong 2021-08-06  144  			vb2_dma_contig_plane_dma_addr(dst_buf, 1);
8cdc3794b2e34b Yunfei Dong 2021-08-06  145  		pfb->base_c.size = ctx->q_data[MTK_Q_DATA_DST].sizeimage[1];
8cdc3794b2e34b Yunfei Dong 2021-08-06  146  	}
8cdc3794b2e34b Yunfei Dong 2021-08-06  147  	mtk_v4l2_debug(1, "id=%d Framebuf  pfb=%p VA=%p Y_DMA=%pad C_DMA=%pad Size=%zx frame_count = %d",
8cdc3794b2e34b Yunfei Dong 2021-08-06  148  		       dst_buf->index, pfb, pfb->base_y.va, &pfb->base_y.dma_addr,
8cdc3794b2e34b Yunfei Dong 2021-08-06  149  		       &pfb->base_c.dma_addr, pfb->base_y.size, ctx->decoded_frame_cnt);
8cdc3794b2e34b Yunfei Dong 2021-08-06  150
8cdc3794b2e34b Yunfei Dong 2021-08-06  151  	return pfb;
8cdc3794b2e34b Yunfei Dong 2021-08-06  152  }
8cdc3794b2e34b Yunfei Dong 2021-08-06  153

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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