Fix a few race conditions that can be triggered by removing a device: - Avoid that request_fn() can be invoked on a dead queue. - Avoid that blk_cleanup_queue() can finish while request_fn is still running. - Fix a race between starved list processing and device removal. - Avoid that a SCSI LLD callback can be invoked after scsi_remove_host() finished. - Speed up device removal by stopping error handling as soon as scsi_remove_host() started. These patches have been tested on top of kernel v3.7-rc7. Changes compared to v5: - Avoid that block layer work can be scheduled on a dead queue. - Do not invoke any SCSI LLD callback after scsi_remove_host() finished. - Stop error handling as soon as scsi_remove_host() started. - Remove the unused function bsg_goose_queue(). - Avoid that scsi_device_set_state() triggers a race condition. Changes compared to v4: - Moved queue_flag_set(QUEUE_FLAG_DEAD, q) from blk_drain_queue() into blk_cleanup_queue(). - Declared the new __blk_run_queue_uncond() function inline. Checked in the generated assembler code that this function is really inlined in __blk_run_queue(). - Elaborated several patch descriptions. - Added sparse annotations to scsi_request_fn(). - Split several patches. Changes compared to v3: - Fixed a race condition by setting QUEUE_FLAG_DEAD earlier. - Added a patch for fixing a race between starved list processing and device removal to this series. Changes compared to v2: - Split second patch into two patches. - Refined patch descriptions. Changes compared to v1: - Included a patch to rename QUEUE_FLAG_DEAD. - Refined the descriptions of the __blk_run_queue_uncond() and blk_cleanup_queue() functions. -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
