mirror of https://gitee.com/openkylin/linux.git
7f43ef9f0d
Fixes the BUG_ON spuriously triggering under the following circumstances: * reservation_object_reserve_shared is called with shared_count == shared_max - 1, so obj->staged is freed in preparation of an in-place update. * reservation_object_add_shared_fence is called with the first fence, after which shared_count == shared_max. * reservation_object_add_shared_fence is called with a follow-up fence from the same context. In the second reservation_object_add_shared_fence call, the BUG_ON triggers. However, nothing bad would happen in reservation_object_add_shared_inplace, since both fences are from the same context, so they only occupy a single slot. Prevent this by moving the BUG_ON to where an overflow would actually happen (e.g. if a buggy caller didn't call reservation_object_reserve_shared before). v2: * Fix description of breaking scenario (Christian König) * Add bugzilla reference Cc: stable@vger.kernel.org Bugzilla: https://bugs.freedesktop.org/106418 Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> # v1 Reviewed-by: Christian König <christian.koenig@amd.com> # v1 Signed-off-by: Michel Dänzer <michel.daenzer@amd.com> Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org> Link: https://patchwork.freedesktop.org/patch/msgid/20180704151405.10357-1-michel@daenzer.net |
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| .. | ||
| Kconfig | ||
| Makefile | ||
| dma-buf.c | ||
| dma-fence-array.c | ||
| dma-fence.c | ||
| reservation.c | ||
| seqno-fence.c | ||
| sw_sync.c | ||
| sync_debug.c | ||
| sync_debug.h | ||
| sync_file.c | ||
| sync_trace.h | ||