3  *  libata-eh.c - libata error handling
121 /* The following table determines timeouts to use for EH internal
326  *	EH context.
349  *	Notify EH that internal command @cmd for @dev timed out.  This
354  *	EH context.
444 		/* doesn't make sense for port-wide EH actions */  in ata_eh_clear_action()
461  *	ata_eh_acquire - acquire EH ownership
462  *	@ap: ATA port to acquire EH ownership for
464  *	Acquire EH ownership for @ap.  This is the basic exclusion
466  *	the same host can claim the ownership of EH.
469  *	EH context.
479  *	ata_eh_release - release EH ownership
480  *	@ap: ATA port to release EH ownership for
482  *	Release EH ownership for @ap if the caller.  The caller must
483  *	have acquired EH ownership using ata_eh_acquire() previously.
486  *	EH context.
574 	/* For new EH, all qcs are finished in one of three ways -  in ata_scsi_cmd_error_handler()
577 	 * completion wins, the qc never reaches EH.  When error  in ata_scsi_cmd_error_handler()
630 		/* If we have timed out qcs.  They belong to EH from  in ata_scsi_cmd_error_handler()
664 		/* acquire EH ownership */  in ata_scsi_port_error_handler()
673 		/* fetch & clear EH info */  in ata_scsi_port_error_handler()
695 		ap->excl_link = NULL;	/* don't maintain exclusion over EH */  in ata_scsi_port_error_handler()
699 		/* invoke EH, skip if unloading or suspended */  in ata_scsi_port_error_handler()
715 		 * EH in such case.  in ata_scsi_port_error_handler()
725 				     "EH pending after %d tries, giving up\n",  in ata_scsi_port_error_handler()
730 		/* this run is complete, make sure EH info is clear */  in ata_scsi_port_error_handler()
734 		/* end eh (clear host_eh_scheduled) while holding  in ata_scsi_port_error_handler()
736 		 * point but before EH completion, SCSI midlayer will  in ata_scsi_port_error_handler()
737 		 * re-initiate EH.  in ata_scsi_port_error_handler()
760 		ata_port_info(ap, "EH complete\n");  in ata_scsi_port_error_handler()
773  *	ata_port_wait_eh - Wait for the currently pending EH to complete
774  *	@ap: Port to wait EH for
776  *	Wait until the currently pending EH is complete.
799 	/* make sure SCSI EH is complete */  in ata_port_wait_eh()
867  *	is non-zero and EH wasn't pending before.  Fast drain ensures
868  *	that EH kicks in in timely manner.
902  *	Schedule error handling for @qc.  EH will kick in as soon as
918 	 * ata_scsi_error() takes care of such scmds on EH entry.  in ata_qc_schedule_eh()
926  * ata_std_sched_eh - non-libsas ata_ports issue eh with this common routine
927  * @ap: ATA port to schedule EH for
947  * ata_std_end_eh - non-libsas ata_ports complete eh with this common routine
948  * @ap: ATA port to end EH for
969  *	@ap: ATA port to schedule EH for
971  *	Schedule error handling for @ap.  EH will kick in as soon as
1013  *	Abort all active qc's active on @link and schedule EH.
1031  *	Abort all active qc's of @ap and schedule EH.
1100  *	ata_eh_freeze_port - EH helper to freeze port
1122  *	ata_eh_thaw_port - EH helper to thaw port
1170  *	ata_eh_qc_complete - Complete an active ATA command from EH
1174  *	completed.  To be used from EH.
1184  *	ata_eh_qc_retry - Tell midlayer to retry an ATA command after EH
1188  *	should be retried.  To be used from EH.
1209  *	EH context.
1255 	/* clear per-dev EH info */  in ata_eh_detach_dev()
1270  *	Called just before performing EH actions to clear related bits
1271  *	in @link->eh_info such that eh actions are not unnecessarily
1291 	/* About to take EH action, set RECOVERED.  Ignore actions on  in ata_eh_about_to_do()
1301  *	ata_eh_done - EH action complete
1302  *	@link: ATA link for which EH actions are complete
1306  *	Called right after performing EH actions to clear related bits
1369  *	EH context (may sleep).
1397  *	SENSE.  This function is an EH helper.
1446  *	SENSE.  This function is EH helper.
1997 	/* enforce default EH actions */  in ata_eh_link_autopsy()
2006 	 * perform per-dev EH action only on the offending device.  in ata_eh_link_autopsy()
2202  *	@link: ATA link EH is going on
2204  *	Report EH to user.
2397  *	@ap: ATA port to report EH about
2399  *	Report EH to user.
2584 		/* mark that this EH session started with reset */  in ata_eh_reset()
2798 		 * repeated EH runs but seems to be a better tradeoff than  in ata_eh_reset()
2851 	 * requirements of ATA_EH_PARK handling. Since the EH thread  in ata_eh_pull_park_action()
3120  *	EH context (may sleep).
3174  *	0 if EH can continue, -errno if EH needs to be repeated.
3212 		 * successfully complete a failed command from EH.  in ata_eh_maybe_retry_flush()
3247  *	EH context.
3490 	/* -EAGAIN from EH routine indicates retry without prejudice.  in ata_eh_handle_dev_fail()
3611 	/* prep for EH */  in ata_eh_recover()
3615 		/* skip EH if possible. */  in ata_eh_recover()
3704 		/* if PMP got attached, return, pmp EH will take care of it */  in ata_eh_recover()
3781  *	ata_eh_finish - finish up EH
3782  *	@ap: host port to finish EH for
3784  *	Recovery is complete.  Clean up EH states and retry or finish
3801 			/* FIXME: Once EH migration is complete,  in ata_eh_finish()
3820 	/* make sure nr_active_links is zero after EH */  in ata_eh_finish()