Fix a few issues that can be triggered by removing a device: - Fix a race between starved list processing and device removal. - Avoid that a SCSI LLD callback can get invoked after scsi_remove_host() finished. - Speed up device removal by stopping error handling as soon as the SHOST_DEL or SHOST_DEL_RECOVERY state has been reached. - Save and restore the host_scribble field during error handling. These patches have been tested on top of kernel v3.9-rc5. Changes compared to v9: - Changed one WARN_ON() statement into a WARN() statement. Changes compared to v8: - Addressed the feedback from Joe Lawrence - dropped the patch that makes scsi_remove_host() wait until the last sdev user is gone. - Eliminated Scsi_Host.tmf_in_progress since it duplicates state information available in Scsi_Host.eh_active. - Added a patch to avoid reenabling I/O after the transport layer became offline. Changes compared to v7: - Addressed the review comments posted by Hannes Reinecke and Rolf Eike Beer. - Modified patch "Make scsi_remove_host() wait until error handling finished" such that it is also safe for SCSI timeout values below the maximum LLD response time by modifying scsi_send_eh_cmnd() such that it does not invoke any LLD code after scsi_remove_host() started. - Added a patch to save and restore the host_scribble field. - Refined / clarified several patch descriptions. - Rebased and retested on top of kernel v3.8-rc6. Changes compared to v6: - Dropped the first six patches since Jens queued these for 3.8. - Added patch to avoid that __scsi_remove_device() is invoked twice. - Restore error recovery in the SHOST_CANCEL state. 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
