Commit Graph

61 Commits

Author SHA1 Message Date
David S. Miller 8cc574a3c5 [SCSI]: Fix scsi_send_eh_cmnd scatterlist handling
This fixes a regression caused by commit:

2dc611de5a

The sense buffer code in scsi_send_eh_cmnd was changed to use
alloc_page() and a scatter list, but the sense data copy was not
updated to match so what we actually get in the sense buffer is total
grabage starting with the kernel address of the struct page we got.
Basically the stack frame of scsi_send_eh_cmd() is what ends up
in the sense buffer.

Depending upon how pointers look on a given platform, you can
end up getting sr_ioctl.c errors when you mount a cdrom.  If
the CDROM gives a check condition for GPCMD_GET_CONFIGURATION issued
by drivers/cdrom/cdrom.c:cdrom_mmc_profile(), sr_ioctl will
spit out this error message in sr_do_ioctl() with the way pointers
are on sparc64:

		default:
			printk(KERN_ERR "%s: CDROM (ioctl) error, command: ", cd->cdi.name);
			__scsi_print_command(cgc->cmd);
			scsi_print_sense_hdr("sr", &sshdr);
			err = -EIO;

This is the error Tom Callaway reported in:

http://marc.info/?l=linux-sparc&m=117407453208101&w=2

Anyways, fix this by using page_address(sgl.page) which is OK
because we know this is low-mem due to GFP_ATOMIC.

Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Christoph Hellwig <hch@lst.de>
2007-04-02 14:26:22 -07:00
Brian King 292148f8bb [SCSI] scsi_error: Fix lost EH commands
If an EH command times out today, the LLDD's abort handler
will be called to abort the command. It is assumed that this
completes successfully, which can result in the command getting
completed later resulting in an oops. Improve the current
implementation by escalating all the way to host reset if
necessary in order to clean up the EH command.

Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2007-02-03 08:32:10 -06:00
Luben Tuikov fd1b494d4a [SCSI] Fix sense key MEDIUM ERROR processing and retry
1) If the device reports an uncorrectable MEDIUM ERROR, such
as SK MEDIUM ERROR, ASC UNRECOVERED READ ERR, AMNF DATA
FIELD or RECORD NOT FOUND, then: In scsi_check_sense()
return SUCCESS so as to not retry -- the error is
uncorrectable -- this speeds up total processing time.

Signed-off-by: Luben Tuikov <ltuikov@yahoo.com>

Extracted the MEDIUM ERROR piece and
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2007-01-31 12:18:52 -06:00
Darrick J. Wong dca84e4694 [SCSI] scsi_error.c: Export some scsi_eh_* functions
Export a couple of functions from scsi_error that are needed to handle
failed SCSI commands from the SAS EH.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>

make exports GPL and
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2007-01-27 10:06:34 -06:00
Christoph Hellwig 2dc611de5a [SCSI] use one-element sg list in scsi_send_eh_cmnd
scsi_send_eh_cmnd is the last user of non-sg commands currently.
This patch switches it to a one-element SG list.  Also updates the
kerneldoc comment for scsi_send_eh_cmnd to reflect reality while we're
at it.

Test on my mptsas card, but this should get testing with as many
drivers as possible.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-11-15 12:55:52 -06:00
Al Viro fa1f5ea860 [PATCH] gfp annotations: scsi_error
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-10-10 15:37:23 -07:00
Stefan Richter 7fbb36451a [PATCH] SCSI: lockdep annotation in scsi_send_eh_cmnd
Fixup for lockdep enabled kernels: Annotate an on-stack completion.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-09-13 07:32:14 -07:00
Mike Christie 0db99e3359 [SCSI] fix scsi_send_eh_cmnd regression
The callers of scsi_send_eh_cmnd are setting the cmnd buffer,
and then scsi_send_eh_cmnd is copying that updated buffer to
the old_cmnd variable. Then after the command runs, we end up
copying that old_cmnd var which has the new cmnd to the scsi
command buffer. When this command gets recent, all types of fun
things happen like getting TUR or START_STOP commands with
data and scatterlists.

This patch made against scsi-rc-fixes, has the callers of
scsi_send_eh_cmnd pass in the command so scsi_send_eh_cmnd
can do the right thing. This should go into 2.6.18 since this
fixes a regression added when we removed some of the scsi_cmnd
fields and replaced them with local variables.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-08-26 10:03:14 -05:00
Christoph Hellwig 631c228cd0 [SCSI] hide EH backup data outside the scsi_cmnd
Currently struct scsi_cmnd has various fields that are used to backup
original data after the corresponding fields have been overridden for
EH commands.  This means drivers can easily get at it and misuse it.
Due to the old_ naming this doesn't happen for most of them, but two
that have different names have been used wrong a lot (see previous
patch).  Another downside is that they unessecarily bloat the scsi_cmnd
size.

This patch moves them onstack in scsi_send_eh_cmnd to fix those two
issues aswell as allowing future EH fixes like moving the EH command
submissions to use SG lists like everything else.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-07-09 11:56:44 -05:00
James Smart d7a1bb0a04 [SCSI] Block I/O while SG reset operation in progress - the midlayer patch
The scsi midlayer portion of the patch

Signed-off-by: James Smart <James.Smart@emulex.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-06-27 10:48:11 -05:00
Jeff Garzik 71d530cd1b Merge branch 'master' into upstream
Conflicts:

	drivers/scsi/libata-core.c
	drivers/scsi/libata-scsi.c
	include/linux/pci_ids.h
2006-06-22 22:11:56 -04:00
Christoph Hellwig 8d7feac3c7 [SCSI] remove RQ_SCSI_* flags
The RQ_SCSI_* flags are a vestiage of a long past history.  The EH code
still sets them but we never make use of that information.  The other
users is pluto.c which never had a chance to work but needs to be kept
compiling to keep Davem happy, so copy over the definition there.

We could probably get rid of RQ_ACTIVE/RQ_INACTIVE aswell with some
work, there's only two more or less bogus looking uses in ubd and scsi.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-06-10 16:25:21 -05:00
Christoph Hellwig beb4048750 [SCSI] remove scsi_request infrastructure
With Achim patch the last user (gdth) is switched away from scsi_request
so we an kill it now.  Also disables some code in i2o_scsi that was
broken since the sg driver stopped using scsi_requests.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-06-10 16:24:40 -05:00
Tejun Heo f8bbfc247e [PATCH] SCSI: make scsi_implement_eh() generic API for SCSI transports
libata implemented a feature to schedule EH without an associated EH
by manipulating shost->host_eh_scheduled in ata_scsi_schedule_eh()
directly.  Move this function to scsi_error.c and rename it to
scsi_schedule_eh().  It is now an exported API for SCSI transports and
exported via new header file drivers/scsi/scsi_transport_api.h

This patch also de-export scsi_eh_wakeup() which was exported
specifically for ata_scsi_schedule_eh().

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
2006-05-20 00:39:08 -04:00
Tejun Heo ee7863bc68 [PATCH] SCSI: implement shost->host_eh_scheduled
libata needs to invoke EH without scmd.  This patch adds
shost->host_eh_scheduled to implement such behavior.

Currently the only user of this feature is libata and no general
interface is defined.  This patch simply adds handling for
host_eh_scheduled where needed and exports scsi_eh_wakeup() to
modules.  The rest is upto libata.  This is the result of the
following discussion.

http://thread.gmane.org/gmane.linux.scsi/23853/focus=9760

In short, SCSI host is not supposed to know about exceptions unrelated
to specific device or command.  Such exceptions should be handled by
transport layer proper.  However, the distinction is not essential to
ATA and libata is planning to depart from SCSI, so, for the time
being, libata will be using SCSI EH to handle such exceptions.

Signed-off-by: Tejun Heo <htejun@gmail.com>
2006-05-15 20:57:20 +09:00
Christoph Hellwig 9227c33de8 [PATCH] move ->eh_strategy_handler to the transport class
Overriding the whole EH code is a per-transport, not per-host thing.
Move ->eh_strategy_handler to the transport class, same as
->eh_timed_out.

Downside is that scsi_host_alloc can't check for the total lack of EH
anymore, but the transition period from old EH where we needed it is
long gone already.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
2006-04-10 14:15:47 -04:00
James Bottomley d04cdb6421 Merge ../linux-2.6 2006-03-21 13:05:45 -06:00
James Bottomley f33b5d783b Merge ../linux-2.6 2006-03-14 14:18:01 -06:00
James Smart c829c39416 [SCSI] FC transport : Avoid device offline cases by stalling aborts until device unblocked
This moves the eh_timed_out functionality from the scsi_host_template
to the transport_template. Given that this is now a transport function,
the EH_RESET_TIMER case no longer caps the timer reschedulings. The
transport guarantees that this is not an infinite condition.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-03-13 08:58:58 -06:00
Jeff Garzik d2dbaad855 Merge branch 'master' 2006-03-01 14:45:47 -05:00
Brian King 8884efab15 [SCSI] scsi: scsi command retries off by one fix
Fix up an off by one error in calculating retries for scsi
commands. This bug was discovered when an SG_IO request
was sent to scsi core with retries = 0, causing the overall
timeout check to go off in scsi_softirq_done.

Signed-off-by: Brian King <brking@us.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-02-27 21:38:39 -06:00
Jeff Garzik 18ee361004 Merge branch 'master' 2006-02-02 01:12:54 -05:00
Tejun Heo 041c5fc33c [PATCH] SCSI: export scsi_eh_finish_cmd() and scsi_eh_flush_done_q()
Export two SCSI EH command handling functions.  To be used by libata EH.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
2006-01-26 22:36:28 -05:00
brking@us.ibm.com bb1d1073a1 [SCSI] Prevent scsi_execute_async from guessing cdb length
When the scsi_execute_async interface was added it ended up reducing
the flexibility of userspace to send arbitrary scsi commands through
sg using SG_IO. The SG_IO interface allows userspace to specify the
CDB length. This is now ignored in scsi_execute_async and it is
guessed using the COMMAND_SIZE macro, which is not always correct,
particularly for vendor specific commands. This patch adds a cmd_len
parameter to the scsi_execute_async interface to allow the caller
to specify the length of the CDB.

Signed-off-by: Brian King <brking@us.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2006-01-26 15:13:50 -05:00
James Bottomley 2a1e1379ba Merge by hand (conflicts in scsi_lib.c)
This merge is pretty extensive.  The conflict is over the new
req->retries parameter, so I had to change the prototype to
scsi_setup_blk_pc_cmnd() and the usage in sd, sr and st.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2005-12-15 17:35:24 -06:00
Mike Christie 6e68af666f [SCSI] Convert SCSI mid-layer to scsi_execute_async
Add scsi helpers to create really-large-requests and convert
scsi-ml to scsi_execute_async().

Per Jens's previous comments, I placed this function in scsi_lib.c.
I made it follow all the queue's limits - I think I did at least :), so
I removed the warning on the function header.

I think the scsi_execute_* functions should eventually take a request_queue
and be placed some place where the dm-multipath hw_handler can use them
if that failover code is going to stay in the kernel. That conversion
patch will be sent in another mail though.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2005-12-14 19:03:35 -08:00
Michael Reed 85631672e6 [SCSI] fix OOPS due to clearing eh_action prior to aborting eh command
The eh_action semaphore in scsi_eh_send_command is cleared after a
command timeout.  The command is subsequently aborted and the abort
will try to call scsi_done() on it.  Unfortunately, the scsi_eh_done()
routine unconditinally completes the semaphore (which is now null).
Fix this race by makiong the scsi_eh_done() routine check that the
semaphore is non null before completing it (mirroring the ordinary
command done/timeout logic).

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2005-12-08 09:13:29 -05:00
Christoph Hellwig 7dfdc9a52b [SCSI] use a completion in scsi_send_eh_cmnd
scsi_send_eh_cmnd currently uses a semaphore and an overload of eh_timer
to either get a completion for a command for a timeout.
Switch to using a completion and wait_for_completion_timeout to simply
the code and not having to deal with the races ourselves.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2005-11-06 12:49:36 -06:00
Christoph Hellwig 474838d5e5 [SCSI] remove Scsi_Host.eh_active
now that the abuse in qla2xxx is gone this field can be remove.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2005-11-06 12:44:44 -06:00
Christoph Hellwig ad42eb1b77 [SCSI] tidy up scsi_error_handler
adjust comments, remove a useless cast and remove a write-only variable.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2005-11-06 12:43:26 -06:00
Jeff Garzik 422c0d61d5 [SCSI] use scmd_id(), scmd_channel() throughout code
Wrap a highly common idiom.  Makes the code easier to read, helps pave
the way for sdev->{id,channel} removal, and adds a token that can easily
by grepped-for in the future.

There are a couple sdev_id() and scmd_printk() updates thrown in as well.

Rejections fixed up and
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2005-10-28 21:10:16 -05:00
Jeff Garzik 3bf743e7c8 [SCSI] use {sdev,scmd,starget,shost}_printk in generic code
rejections fixed and
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2005-10-28 20:52:11 -05:00
James Bottomley 9ccfc756a7 [SCSI] move the mid-layer printk's over to shost/starget/sdev_printk
This should eliminate (at least in the mid layer) to make numeric
assumptions about any of the enumeration variables.  As a side effect,
it will also make all the messages consistent and line us up nicely for
the error logging strategy (if it ever shows itself again).

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2005-10-28 14:23:02 -05:00
Steven Rostedt 461a0ffbec [PATCH] scsi_error thread exits in TASK_INTERRUPTIBLE state.
Found in the -rt patch set.  The scsi_error thread likely will be in the
TASK_INTERRUPTIBLE state upon exit.  This patch fixes this bug.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-19 23:16:21 -07:00
James Bottomley 3ed7a4704b [SCSI] Fix thread termination for the SCSI error handle
From: 	Alan Stern <stern@rowland.harvard.edu>

This patch (as561) fixes the error handler's thread-exit code.  The
kthread_stop call won't wake the thread from a down_interruptible, so
the patch gets rid of the semaphore and simply does

        set_current_state(TASK_INTERRUPTIBLE);

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>

Modified to simplify the termination loop and correct the sleep condition.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2005-09-19 09:50:04 -05:00
James Bottomley 939647ee30 [SCSI] fix oops on usb storage device disconnect
We fix the oops by enforcing the host state model.  There have also
been two extra states added: SHOST_CANCEL_RECOVERY and
SHOST_DEL_RECOVERY so we can take the model through host removal while
the recovery thread is active.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2005-09-19 09:24:52 -05:00
James Bottomley 17fa53da12 Merge by hand (conflicts in sd.c) 2005-09-06 17:52:54 -05:00
Christoph Hellwig fe1b2d544d [SCSI] unexport scsi_add_timer/scsi_delete_timer
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2005-09-06 17:26:37 -05:00
Christoph Hellwig c5478def7a [SCSI] switch EH thread startup to the kthread API
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2005-09-06 17:26:06 -05:00
Alan Stern e47373ec1c [SCSI] return success after retries in scsi_eh_tur
The problem lies in the way the error handler uses TEST UNIT READY to
tell whether error recovery has succeeded.  The scsi_eh_tur function
gives up after one round of retrying; after that it decides that more
error recovery is needed.

However TUR is liable to report sense data indicating a retry is needed
when in fact error recovery has succeeded.  A typical example might be
SK=2, ASC=4, ASCQ=1 (Logical unit in process of becoming ready).  The mere
fact that we were able to get a sensible reply to the TUR should indicate
that the device is working well enough to stop error recovery.

I ran across a case back in January where this happened.  A CD-ROM drive
timed out the INQUIRY command, and a device reset fixed the blockage.
But then the drive kept responding with 2/4/1 -- because it was spinning
up I suppose -- until the error handler gave up and placed it offline.
If the initial INQUIRY had received the 2/4/1 instead, everything would
have worked okay.  It doesn't seem reasonable for things to fail just
because the error handler had started running.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2005-09-06 17:19:23 -05:00
James Bottomley 33aa687db9 [SCSI] convert SPI transport class to scsi_execute
This one's slightly more difficult.  The transport class uses
REQ_FAILFAST, so another interface (scsi_execute) had to be invented to
take the extra flag.  Also, the sense functions are shifted around to
allow spi_execute to place data directly into a struct scsi_sense_hdr.
With this change, there's probably a lot of unnecessary sense buffer
allocation going on which we can fix later.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2005-08-28 11:31:14 -05:00
Mike Anderson d330187408 [SCSI] host state model update: replace old host bitmap state
Migrate the current SCSI host state model to a model like SCSI
device is using.

Signed-off-by: Mike Anderson <andmike@us.ibm.com>

Rejections fixed up and

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2005-07-30 11:10:24 -05:00
Christoph Hellwig 937abeaadf [SCSI] use list_for_each_entry_safe in scsi_error.c
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2005-06-26 12:20:42 -05:00
Christoph Hellwig 3111b0d164 [SCSI] remove scsi_eh_eflags_ macros
Just opencoded access to eh_eflags, it's much more readable anyway.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2005-06-26 12:17:24 -05:00
Christoph Hellwig 8d115f845a [SCSI] remove scsi_cmnd->state
We never look at it except for the old megaraid driver that abuses it
for sending internal commands.  That usage can be fixed easily because
those internal commands are single-threaded by a mutex and we can easily
use a completion there.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2005-06-26 12:16:24 -05:00
Christoph Hellwig b4edcbcafd [SCSI] remove scsi_cmnd->owner
never checked anywhere

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2005-06-26 12:15:28 -05:00
Christoph Hellwig f5ad56145d [SCSI] remove scsi_cmnd->abort_reason
Never used for anything but printing it out in debug routines.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2005-06-26 12:14:46 -05:00
Jeff Garzik df0ae2497d [SCSI] allow sleeping in ->eh_host_reset_handler()
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2005-06-17 12:05:18 -05:00
Jeff Garzik 68b3aa7c98 [SCSI] allow sleeping in ->eh_bus_reset_handler()
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2005-06-17 12:05:10 -05:00
Jeff Garzik 94d0e7b805 [SCSI] allow sleeping in ->eh_device_reset_handler()
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
2005-06-17 12:05:03 -05:00