drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c:2341:52: warning: Uninitialized variable: pw
From: kernel test robot
Date: Tue Oct 27 2020 - 13:08:53 EST
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 4525c8781ec0701ce824e8bd379ae1b129e26568
commit: c60b93cd4862d108214a14e655358ea714d7a12a drm/i915: Avoid mixing integer types during batch copies
date: 4 weeks ago
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>
"cppcheck warnings: (new ones prefixed by >>)"
>> drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c:2341:52: warning: Uninitialized variable: pw [uninitvar]
GEM_BUG_ON(overflows_type(eb->batch_start_offset, pw->batch_offset));
^
drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c:2342:43: warning: Uninitialized variable: pw [uninitvar]
GEM_BUG_ON(overflows_type(eb->batch_len, pw->batch_length));
^
cppcheck possible warnings: (new ones prefixed by >>, may not real problems)
drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c:1535:6: warning: Local variable reloc_gpu shadows outer function [shadowFunction]
int reloc_gpu = reloc_entry_gpu(eb, vma, offset, target_addr);
^
drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c:1384:13: note: Shadowed declaration
static u32 *reloc_gpu(struct i915_execbuffer *eb,
^
drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c:1535:6: note: Shadow variable
int reloc_gpu = reloc_entry_gpu(eb, vma, offset, target_addr);
^
vim +2341 drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
2333
2334 static int eb_parse_pipeline(struct i915_execbuffer *eb,
2335 struct i915_vma *shadow,
2336 struct i915_vma *trampoline)
2337 {
2338 struct eb_parse_work *pw;
2339 int err;
2340
> 2341 GEM_BUG_ON(overflows_type(eb->batch_start_offset, pw->batch_offset));
2342 GEM_BUG_ON(overflows_type(eb->batch_len, pw->batch_length));
2343
2344 pw = kzalloc(sizeof(*pw), GFP_KERNEL);
2345 if (!pw)
2346 return -ENOMEM;
2347
2348 err = i915_active_acquire(&eb->batch->vma->active);
2349 if (err)
2350 goto err_free;
2351
2352 err = i915_active_acquire(&shadow->active);
2353 if (err)
2354 goto err_batch;
2355
2356 if (trampoline) {
2357 err = i915_active_acquire(&trampoline->active);
2358 if (err)
2359 goto err_shadow;
2360 }
2361
2362 dma_fence_work_init(&pw->base, &eb_parse_ops);
2363
2364 pw->engine = eb->engine;
2365 pw->batch = eb->batch->vma;
2366 pw->batch_offset = eb->batch_start_offset;
2367 pw->batch_length = eb->batch_len;
2368 pw->shadow = shadow;
2369 pw->trampoline = trampoline;
2370
2371 /* Mark active refs early for this worker, in case we get interrupted */
2372 err = parser_mark_active(pw, eb->context->timeline);
2373 if (err)
2374 goto err_commit;
2375
2376 err = dma_resv_reserve_shared(pw->batch->resv, 1);
2377 if (err)
2378 goto err_commit;
2379
2380 /* Wait for all writes (and relocs) into the batch to complete */
2381 err = i915_sw_fence_await_reservation(&pw->base.chain,
2382 pw->batch->resv, NULL, false,
2383 0, I915_FENCE_GFP);
2384 if (err < 0)
2385 goto err_commit;
2386
2387 /* Keep the batch alive and unwritten as we parse */
2388 dma_resv_add_shared_fence(pw->batch->resv, &pw->base.dma);
2389
2390 /* Force execution to wait for completion of the parser */
2391 dma_resv_add_excl_fence(shadow->resv, &pw->base.dma);
2392
2393 dma_fence_work_commit_imm(&pw->base);
2394 return 0;
2395
2396 err_commit:
2397 i915_sw_fence_set_error_once(&pw->base.chain, err);
2398 dma_fence_work_commit_imm(&pw->base);
2399 return err;
2400
2401 err_shadow:
2402 i915_active_release(&shadow->active);
2403 err_batch:
2404 i915_active_release(&eb->batch->vma->active);
2405 err_free:
2406 kfree(pw);
2407 return err;
2408 }
2409
---
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