On 8/10/22 14:30, Christian König wrote: > Am 25.07.22 um 17:18 schrieb Dmitry Osipenko: >> This patch moves the non-dynamic dma-buf users over to the dynamic >> locking specification. The strict locking convention prevents deadlock >> situation for dma-buf importers and exporters. >> >> Previously the "unlocked" versions of the dma-buf API functions weren't >> taking the reservation lock and this patch makes them to take the lock. >> >> Intel and AMD GPU drivers already were mapping imported dma-bufs under >> the held lock, hence the "locked" variant of the functions are added >> for them and the drivers are updated to use the "locked" versions. > > In general "Yes, please", but that won't be that easy. > > You not only need to change amdgpu and i915, but all drivers > implementing the map_dma_buf(), unmap_dma_buf() callbacks. > > Auditing all that code is a huge bunch of work. Hm, neither of drivers take the resv lock in map_dma_buf/unmap_dma_buf. It's easy to audit them all and I did it. So either I'm missing something or it doesn't take much time to check them all. Am I really missing something? https://elixir.bootlin.com/linux/latest/A/ident/map_dma_buf -- Best regards, Dmitry
