Hi "Christian, url: https://github.com/0day-ci/linux/commits/Christian-K-nig/dma-buf-fix-and-rework-dma_buf_poll-v3/20210622-210643 base: git://anongit.freedesktop.org/tegra/linux.git drm/tegra/for-next config: i386-randconfig-m021-20210622 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx> smatch warnings: drivers/dma-buf/dma-buf.c:290 dma_buf_poll() error: uninitialized symbol 'fence_excl'. vim +/fence_excl +290 drivers/dma-buf/dma-buf.c afc9a42b7464f7 Al Viro 2017-07-03 208 static __poll_t dma_buf_poll(struct file *file, poll_table *poll) 9b495a5887994a Maarten Lankhorst 2014-07-01 209 { d40fce0f010662 Christian König 2021-06-22 210 struct dma_buf_poll_cb_t *dcb; 9b495a5887994a Maarten Lankhorst 2014-07-01 211 struct dma_buf *dmabuf; 52791eeec1d9f4 Christian König 2019-08-11 212 struct dma_resv *resv; 52791eeec1d9f4 Christian König 2019-08-11 213 struct dma_resv_list *fobj; f54d1867005c33 Chris Wilson 2016-10-25 214 struct dma_fence *fence_excl; b016cd6ed4b772 Chris Wilson 2019-08-14 215 unsigned shared_count, seq; d40fce0f010662 Christian König 2021-06-22 216 struct dma_fence *fence; d40fce0f010662 Christian König 2021-06-22 217 __poll_t events; d40fce0f010662 Christian König 2021-06-22 218 int r, i; 9b495a5887994a Maarten Lankhorst 2014-07-01 219 9b495a5887994a Maarten Lankhorst 2014-07-01 220 dmabuf = file->private_data; 9b495a5887994a Maarten Lankhorst 2014-07-01 221 if (!dmabuf || !dmabuf->resv) a9a08845e9acbd Linus Torvalds 2018-02-11 222 return EPOLLERR; 9b495a5887994a Maarten Lankhorst 2014-07-01 223 9b495a5887994a Maarten Lankhorst 2014-07-01 224 resv = dmabuf->resv; 9b495a5887994a Maarten Lankhorst 2014-07-01 225 9b495a5887994a Maarten Lankhorst 2014-07-01 226 poll_wait(file, &dmabuf->poll, poll); 9b495a5887994a Maarten Lankhorst 2014-07-01 227 a9a08845e9acbd Linus Torvalds 2018-02-11 228 events = poll_requested_events(poll) & (EPOLLIN | EPOLLOUT); 9b495a5887994a Maarten Lankhorst 2014-07-01 229 if (!events) 9b495a5887994a Maarten Lankhorst 2014-07-01 230 return 0; 9b495a5887994a Maarten Lankhorst 2014-07-01 231 d40fce0f010662 Christian König 2021-06-22 232 dcb = events & EPOLLOUT ? &dmabuf->cb_out : &dmabuf->cb_in; d40fce0f010662 Christian König 2021-06-22 233 d40fce0f010662 Christian König 2021-06-22 234 /* Only queue a new one if we are not still waiting for the old one */ d40fce0f010662 Christian König 2021-06-22 235 spin_lock_irq(&dmabuf->poll.lock); d40fce0f010662 Christian König 2021-06-22 236 if (dcb->active) d40fce0f010662 Christian König 2021-06-22 237 events = 0; d40fce0f010662 Christian König 2021-06-22 238 else d40fce0f010662 Christian König 2021-06-22 239 dcb->active = events; d40fce0f010662 Christian König 2021-06-22 240 spin_unlock_irq(&dmabuf->poll.lock); d40fce0f010662 Christian König 2021-06-22 241 if (!events) d40fce0f010662 Christian König 2021-06-22 242 return 0; d40fce0f010662 Christian König 2021-06-22 243 b016cd6ed4b772 Chris Wilson 2019-08-14 244 retry: b016cd6ed4b772 Chris Wilson 2019-08-14 245 seq = read_seqcount_begin(&resv->seq); 3c3b177a9369b2 Maarten Lankhorst 2014-07-01 246 rcu_read_lock(); b016cd6ed4b772 Chris Wilson 2019-08-14 247 b016cd6ed4b772 Chris Wilson 2019-08-14 248 fobj = rcu_dereference(resv->fence); d40fce0f010662 Christian König 2021-06-22 249 if (fobj && events & EPOLLOUT) b016cd6ed4b772 Chris Wilson 2019-08-14 250 shared_count = fobj->shared_count; b016cd6ed4b772 Chris Wilson 2019-08-14 251 else b016cd6ed4b772 Chris Wilson 2019-08-14 252 shared_count = 0; d40fce0f010662 Christian König 2021-06-22 253 d40fce0f010662 Christian König 2021-06-22 254 for (i = 0; i < shared_count; ++i) { d40fce0f010662 Christian König 2021-06-22 255 fence = rcu_dereference(fobj->shared[i]); d40fce0f010662 Christian König 2021-06-22 256 fence = dma_fence_get_rcu(fence); d40fce0f010662 Christian König 2021-06-22 257 if (!fence || read_seqcount_retry(&resv->seq, seq)) { d40fce0f010662 Christian König 2021-06-22 258 /* Concurrent modify detected, force re-check */ d40fce0f010662 Christian König 2021-06-22 259 dma_fence_put(fence); b016cd6ed4b772 Chris Wilson 2019-08-14 260 rcu_read_unlock(); b016cd6ed4b772 Chris Wilson 2019-08-14 261 goto retry; b016cd6ed4b772 Chris Wilson 2019-08-14 262 } b016cd6ed4b772 Chris Wilson 2019-08-14 263 d40fce0f010662 Christian König 2021-06-22 264 r = dma_fence_add_callback(fence, &dcb->cb, dma_buf_poll_cb); d40fce0f010662 Christian König 2021-06-22 265 if (!r) { d40fce0f010662 Christian König 2021-06-22 266 /* Callback queued */ d40fce0f010662 Christian König 2021-06-22 267 events = 0; d40fce0f010662 Christian König 2021-06-22 268 goto out; 9b495a5887994a Maarten Lankhorst 2014-07-01 269 } d40fce0f010662 Christian König 2021-06-22 270 dma_fence_put(fence); 04a5faa8cbe5a8 Maarten Lankhorst 2014-07-01 271 } 9b495a5887994a Maarten Lankhorst 2014-07-01 272 d40fce0f010662 Christian König 2021-06-22 273 fence = dma_resv_get_excl(resv); d40fce0f010662 Christian König 2021-06-22 274 if (fence && shared_count == 0) { d40fce0f010662 Christian König 2021-06-22 275 fence = dma_fence_get_rcu(fence); d40fce0f010662 Christian König 2021-06-22 276 if (!fence || read_seqcount_retry(&resv->seq, seq)) { d40fce0f010662 Christian König 2021-06-22 277 /* Concurrent modify detected, force re-check */ d40fce0f010662 Christian König 2021-06-22 278 dma_fence_put(fence); d40fce0f010662 Christian König 2021-06-22 279 rcu_read_unlock(); d40fce0f010662 Christian König 2021-06-22 280 goto retry; 9b495a5887994a Maarten Lankhorst 2014-07-01 281 d40fce0f010662 Christian König 2021-06-22 282 } 9b495a5887994a Maarten Lankhorst 2014-07-01 283 d40fce0f010662 Christian König 2021-06-22 284 r = dma_fence_add_callback(fence, &dcb->cb, dma_buf_poll_cb); d40fce0f010662 Christian König 2021-06-22 285 if (!r) { d40fce0f010662 Christian König 2021-06-22 286 /* Callback queued */ d40fce0f010662 Christian König 2021-06-22 287 events = 0; 9b495a5887994a Maarten Lankhorst 2014-07-01 288 goto out; 3c3b177a9369b2 Maarten Lankhorst 2014-07-01 289 } d40fce0f010662 Christian König 2021-06-22 @290 dma_fence_put(fence_excl); ^^^^^^^^^^ Never initialized. Is part of the commit missing? 04a5faa8cbe5a8 Maarten Lankhorst 2014-07-01 291 } 9b495a5887994a Maarten Lankhorst 2014-07-01 292 9b495a5887994a Maarten Lankhorst 2014-07-01 293 /* No callback queued, wake up any additional waiters. */ 9b495a5887994a Maarten Lankhorst 2014-07-01 294 dma_buf_poll_cb(NULL, &dcb->cb); 9b495a5887994a Maarten Lankhorst 2014-07-01 295 9b495a5887994a Maarten Lankhorst 2014-07-01 296 out: 3c3b177a9369b2 Maarten Lankhorst 2014-07-01 297 rcu_read_unlock(); 9b495a5887994a Maarten Lankhorst 2014-07-01 298 return events; 9b495a5887994a Maarten Lankhorst 2014-07-01 299 } --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
