Hi, Sinan On 2018/12/9 4:28, Sinan Kaya wrote: > On 12/6/2018 11:29 PM, Shunyong Yang wrote: >> When dma_cookie_complete() is called in hidma_process_completed(), >> dma_cookie_status() will return DMA_COMPLETE in hidma_tx_status(). Then, >> hidma_txn_is_success() will be called to use channel cookie >> mchan->last_success to do additional DMA status check. Current code >> assigns mchan->last_success after dma_cookie_complete(). This causes >> a race condition of dma_cookie_status() returns DMA_COMPLETE before >> mchan->last_success is assigned correctly. The race will cause >> hidma_tx_status() return DMA_ERROR but the transaction is actually a >> success. Moreover, in async_tx case, it will cause a timeout panic >> in async_tx_quiesce(). >> >> Kernel panic - not syncing: async_tx_quiesce: DMA error waiting for >> transaction >> ... >> Call trace: >> [<ffff000008089994>] dump_backtrace+0x0/0x1f4 >> [<ffff000008089bac>] show_stack+0x24/0x2c >> [<ffff00000891e198>] dump_stack+0x84/0xa8 >> [<ffff0000080da544>] panic+0x12c/0x29c >> [<ffff0000045d0334>] async_tx_quiesce+0xa4/0xc8 [async_tx] >> [<ffff0000045d03c8>] async_trigger_callback+0x70/0x1c0 [async_tx] >> [<ffff0000048b7d74>] raid_run_ops+0x86c/0x1540 [raid456] >> [<ffff0000048bd084>] handle_stripe+0x5e8/0x1c7c [raid456] >> [<ffff0000048be9ec>] handle_active_stripes.isra.45+0x2d4/0x550 [raid456] >> [<ffff0000048beff4>] raid5d+0x38c/0x5d0 [raid456] >> [<ffff000008736538>] md_thread+0x108/0x168 >> [<ffff0000080fb1cc>] kthread+0x10c/0x138 >> [<ffff000008084d34>] ret_from_fork+0x10/0x18 >> >> Cc: Joey Zheng<yu.zheng@xxxxxxxxxxxxxxxx> >> Signed-off-by: Shunyong Yang<shunyong.yang@xxxxxxxxxxxxxxxx> > > > Acked-by: Sinan Kaya <okaya@xxxxxxxxxx> > > to both patches 1/2 and 2/2. > > Thanks for the ACKs. Shunyong.
