Hi Jia-Ju, [auto build test WARNING on linuxtv-media/master] [also build test WARNING on v4.12-rc3 next-20170531] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Jia-Ju-Bai/cx18-Fix-a-sleep-in-atomic-bug-in-snd_cx18_pcm_hw_free/20170601-131553 base: git://linuxtv.org/media_tree.git master config: xtensa-allmodconfig (attached as .config) compiler: xtensa-linux-gcc (GCC) 4.9.0 reproduce: wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree make.cross ARCH=xtensa Note: it may well be a FALSE warning. FWIW you are at least aware of it now. http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings All warnings (new ones prefixed by >>): drivers/media//pci/cx18/cx18-alsa-pcm.c: In function 'snd_cx18_pcm_hw_free': >> drivers/media//pci/cx18/cx18-alsa-pcm.c:269:2: warning: 'dma_area' may be used uninitialized in this function [-Wmaybe-uninitialized] vfree(dma_area); ^ vim +/dma_area +269 drivers/media//pci/cx18/cx18-alsa-pcm.c 253 params_buffer_bytes(params)); 254 } 255 256 static int snd_cx18_pcm_hw_free(struct snd_pcm_substream *substream) 257 { 258 struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream); 259 unsigned long flags; 260 unsigned char *dma_area; 261 262 spin_lock_irqsave(&cxsc->slock, flags); 263 if (substream->runtime->dma_area) { 264 dprintk("freeing pcm capture region\n"); 265 dma_area = substream->runtime->dma_area; 266 substream->runtime->dma_area = NULL; 267 } 268 spin_unlock_irqrestore(&cxsc->slock, flags); > 269 vfree(dma_area); 270 271 return 0; 272 } 273 274 static int snd_cx18_pcm_prepare(struct snd_pcm_substream *substream) 275 { 276 struct snd_cx18_card *cxsc = snd_pcm_substream_chip(substream); 277 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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