linux/drivers/scsi, branch v2.6.25.2

SCSI: qla2xxx: Correct regression in relogin code.

2008-05-01T21:44:39Z

commit: 666301e673e192c87a40e07a8357d6996b57b70f upstream Commit 63a8651f2548c6bb5132c0b4e7dad4f57a9274db ([SCSI] qla2xxx: Correct infinite-login-retry issue.) introduced a small regression where a successful relogin would result in an fcport's loop_id to be incorrectly reset to FC_NO_LOOP_ID. Only clear-out loopid, if retries have been 'truly' exhausted. Signed-off-by: Andrew Vasquez Signed-off-by: James Bottomley Signed-off-by: Greg Kroah-Hartman

scsi: fix sense_slab/bio swapping livelock

2008-04-06T23:10:08Z

Since 2.6.25-rc7, I've been seeing an occasional livelock on one x86_64 machine, copying kernel trees to tmpfs, paging out to swap. Signature: 6000 pages under writeback but never getting written; most tasks of interest trying to reclaim, but each get_swap_bio waiting for a bio in mempool_alloc's io_schedule_timeout(5*HZ); every five seconds an atomic page allocation failure report from kblockd failing to allocate a sense_buffer in __scsi_get_command. __scsi_get_command has a (one item) free_list to protect against this, but rc1's [SCSI] use dynamically allocated sense buffer de25deb18016f66dcdede165d07654559bb332bc upset that slightly. When it fails to allocate from the separate sense_slab, instead of giving up, it must fall back to the command free_list, which is sure to have a sense_buffer attached. Either my earlier -rc testing missed this, or there's some recent contributory factor. One very significant factor is SLUB, which merges slab caches when it can, and on 64-bit happens to merge both bio cache and sense_slab cache into kmalloc's 128-byte cache: so that under this swapping load, bios above are liable to gobble up all the slots needed for scsi_cmnd sense_buffers below. That's disturbing behaviour, and I tried a few things to fix it. Adding a no-op constructor to the sense_slab inhibits SLUB from merging it, and stops all the allocation failures I was seeing; but it's rather a hack, and perhaps in different configurations we have other caches on the swapout path which are ill-merged. Another alternative is to revert the separate sense_slab, using cache-line-aligned sense_buffer allocated beyond scsi_cmnd from the one kmem_cache; but that might waste more memory, and is only a way of diverting around the known problem. While I don't like seeing the allocation failures, and hate the idea of all those bios piled up above a scsi host working one by one, it does seem to emerge fairly soon with the livelock fix. So lacking better ideas, stick with that one clear fix for now. Signed-off-by: Hugh Dickins Cc: James Bottomley Cc: Andrew Morton Cc: FUJITA Tomonori Cc: Jens Axboe Cc: Christoph Lameter Cc: Pekka Enberg Cc: Peter Zijlstra Cc: Rafael J. Wysocki Signed-off-by: Linus Torvalds

[SCSI] mvsas: check subsystem id

2008-03-28T17:32:22Z

add support for mv6480 chip which subsystem id is 6480 in spite of device id is 6440. Signed-off-by: Ke Wei Signed-off-by: James Bottomley

[SCSI] mvsas: get phy info.

2008-03-28T17:32:09Z

removed unused code and attached SATA address makes use of port id. enable HBA interrupt after calling sas_register_ha(); Signed-off-by: Ke Wei Signed-off-by: James Bottomley

[SCSI] mvsas: fix the buffer of rx DMA overflow bug

2008-03-28T17:31:54Z

fix the buffer of rx DMA overflow bug. fix default queue depth. Signed-off-by: Ke Wei Signed-off-by: James Bottomley

[SCSI] mvsas: retry aborting task.

2008-03-28T17:31:40Z

Signed-off-by: Ke Wei Signed-off-by: James Bottomley

[SCSI] mvsas: check hd whether unplugged

2008-03-28T17:31:25Z

if unplugged, driver's queuecommand function will return SAS_PHY_DOWN. task->lldd_task is used for saving its slot info. Signed-off-by: Ke Wei Signed-off-by: James Bottomley

[SCSI] mvsas : interrupt handling

2008-03-28T17:31:03Z

When a slot is busy, we will not free this slot until slot reset is completed. When unplugged the disk, we should release all command tasks with unplugged port that have been sent. If MVS_USE_TASKLET is defined, we can enable tasklet. Default is off. Signed-off-by: Ke Wei Signed-off-by: James Bottomley

[SCSI] mvsas: a tag handler implementation

2008-03-28T17:27:54Z

add a new tag handler to create slot num. When a slot num is busy, new task can't hit this bit which was already used. plumb in phy speeds. Signed-off-by: Ke Wei Signed-off-by: James Bottomley

[SCSI] mvsas: fill in error info record and phy mode6 bits.

2008-03-28T17:27:16Z

and remove some unused members from struct. Signed-off-by: Ke Wei Signed-off-by: James Bottomley