forked from luck/tmp_suning_uos_patched
f281233d3e
Move the mid-layer's ->queuecommand() invocation from being locked with the host lock to being unlocked to facilitate speeding up the critical path for drivers who don't need this lock taken anyway. The patch below presents a simple SCSI host lock push-down as an equivalent transformation. No locking or other behavior should change with this patch. All existing bugs and locking orders are preserved. Additionally, add one parameter to queuecommand, struct Scsi_Host * and remove one parameter from queuecommand, void (*done)(struct scsi_cmnd *) Scsi_Host* is a convenient pointer that most host drivers need anyway, and 'done' is redundant to struct scsi_cmnd->scsi_done. Minimal code disturbance was attempted with this change. Most drivers needed only two one-line modifications for their host lock push-down. Signed-off-by: Jeff Garzik <jgarzik@redhat.com> Acked-by: James Bottomley <James.Bottomley@suse.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
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.. | ||
bus-osm.c | ||
config-osm.c | ||
core.h | ||
debug.c | ||
device.c | ||
driver.c | ||
exec-osm.c | ||
i2o_block.c | ||
i2o_block.h | ||
i2o_config.c | ||
i2o_proc.c | ||
i2o_scsi.c | ||
iop.c | ||
Kconfig | ||
Makefile | ||
memory.c | ||
pci.c | ||
README | ||
README.ioctl |
Linux I2O Support (c) Copyright 1999 Red Hat Software and others. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. AUTHORS (so far) Alan Cox, Building Number Three Ltd. Core code, SCSI and Block OSMs Steve Ralston, LSI Logic Corp. Debugging SCSI and Block OSM Deepak Saxena, Intel Corp. Various core/block extensions /proc interface, bug fixes Ioctl interfaces for control Debugging LAN OSM Philip Rumpf Fixed assorted dumb SMP locking bugs Juha Sievanen, University of Helsinki Finland LAN OSM code /proc interface to LAN class Bug fixes Core code extensions Auvo Häkkinen, University of Helsinki Finland LAN OSM code /Proc interface to LAN class Bug fixes Core code extensions Taneli Vähäkangas, University of Helsinki Finland Fixes to i2o_config CREDITS This work was made possible by Red Hat Software Funding for the Building #3 part of the project Symbios Logic (Now LSI) Host adapters, hints, known to work platforms when I hit compatibility problems BoxHill Corporation Loan of initial FibreChannel disk array used for development work. European Comission Funding the work done by the University of Helsinki SysKonnect Loan of FDDI and Gigabit Ethernet cards ASUSTeK Loan of I2O motherboard STATUS: o The core setup works within limits. o The scsi layer seems to almost work. I'm still chasing down the hang bug. o The block OSM is mostly functional o LAN OSM works with FDDI and Ethernet cards. TO DO: General: o Provide hidden address space if asked o Long term message flow control o PCI IOP's without interrupts are not supported yet o Push FAIL handling into the core o DDM control interfaces for module load etc o Add I2O 2.0 support (Deffered to 2.5 kernel) Block: o Multiple major numbers o Read ahead and cache handling stuff. Talk to Ingo and people o Power management o Finish Media changers SCSI: o Find the right way to associate drives/luns/busses Lan: o Performance tuning o Test Fibre Channel code Tape: o Anyone seen anything implementing this ? (D.S: Will attempt to do so if spare cycles permit)