You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

James Smart aedf349773 [SCSI] FC transport: fixes for workq deadlocks ... As previously reported via Michael Reed, the FC transport took a hit in 2.6.15 (perhaps a little earlier) when we solved a recursion error. There are 2 deadlocks occurring: - With scan and the delete items sharing the same workq, flushing the workq for the delete code was getting it stalled behind a very long running scan code path. - There's a deadlock where scsi_remove_target() has to sit behind scsi_scan_target() due to contention over the scan_lock(). This patch resolves the 1st deadlock and significantly reduces the odds of the second. So far, we have only replicated the 2nd deadlock on a highly-parallel SMP system. More on the 2nd deadlock in a following email. This patch reworks the transport to: - Only use the scsi host workq for scanning - Use 2 other workq's internally. One for deletions, the other for scheduled deletions. Originally, we tried this with a single workq, but the occassional flushes of the scheduled queues was hitting the second deadlock with a slightly higher frequency. In the future, we'll look at the LLDD's and the transport to see if we can get rid of this extra overhead. - When moving to the other workq's we tightened up some object states and some lock handling. - Properly syncs adds/deletes - minor code cleanups - directly reference fc_host_attrs, rather than through attribute macros - flush the right workq on delayed work cancel failures. Large kudos to Michael Reed who has been working this issue for the last month. Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>		19 years ago
..
iscsi_if.h	[SCSI] iscsi update: cleanup iscsi class interface	19 years ago
iscsi_proto.h	…
scsi.h	[SCSI] fix scsi process problems and clean up the target reap issues	19 years ago
scsi_cmnd.h	[SCSI] Neaten comments in scsi_cmnd.h	19 years ago
scsi_dbg.h	[SCSI] Rename scsi_print_msg to spi_print_msg	19 years ago
scsi_device.h	[SCSI] add scsi_mode_select to scsi_lib.c	19 years ago
scsi_devinfo.h	[SCSI] add SCSI_UNKNOWN and LUN transfer limit restrictions	19 years ago
scsi_driver.h	[BLOCK] update SCSI to use new blk_ordered for barriers	19 years ago
scsi_eh.h	[PATCH] SCSI: export scsi_eh_finish_cmd() and scsi_eh_flush_done_q()	19 years ago
scsi_host.h	[PATCH] move ->eh_strategy_handler to the transport class	19 years ago
scsi_ioctl.h	[SCSI] unify SCSI_IOCTL_SEND_COMMAND implementations	19 years ago
scsi_request.h	[SCSI] remove scsi_wait_req	19 years ago
scsi_tcq.h	…
scsi_transport.h	[PATCH] move ->eh_strategy_handler to the transport class	19 years ago
scsi_transport_fc.h	[SCSI] FC transport: fixes for workq deadlocks	19 years ago
scsi_transport_iscsi.h	[SCSI] iscsi update: cleanup iscsi class interface	19 years ago
scsi_transport_sas.h	[SCSI] eliminate rphy allocation in favour of expander/end device allocation	19 years ago
scsi_transport_spi.h	[SCSI] Add spi_populate_*_msg functions	19 years ago
scsicam.h	…
sg.h	…
sg_request.h	…
srp.h	…