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2009-12-10[SCSI] mpt fusion: Fix 32 bit platforms with 64 bit resources.Pravin Bathija
Powerpc 44x uses 36 bit real address while the real address defined in MPT Fusion driver is of type 32 bit. This causes ioremap to fail and driver fails to initialize. This fix changes the data types representing the real address from unsigned long 32-bit types to resource_size_t which is 64-bit. The driver has been tested, the disks get discovered correctly and can do IO. [jejb: added printk fix for resource_size_t object] Signed-off-by: Pravin Bathija <pbathija@amcc.com> Acked-by: "Desai, Kashyap" <Kashyap.Desai@lsi.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-12-09Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (42 commits) tree-wide: fix misspelling of "definition" in comments reiserfs: fix misspelling of "journaled" doc: Fix a typo in slub.txt. inotify: remove superfluous return code check hdlc: spelling fix in find_pvc() comment doc: fix regulator docs cut-and-pasteism mtd: Fix comment in Kconfig doc: Fix IRQ chip docs tree-wide: fix assorted typos all over the place drivers/ata/libata-sff.c: comment spelling fixes fix typos/grammos in Documentation/edac.txt sysctl: add missing comments fs/debugfs/inode.c: fix comment typos sgivwfb: Make use of ARRAY_SIZE. sky2: fix sky2_link_down copy/paste comment error tree-wide: fix typos "couter" -> "counter" tree-wide: fix typos "offest" -> "offset" fix kerneldoc for set_irq_msi() spidev: fix double "of of" in comment comment typo fix: sybsystem -> subsystem ...
2009-12-04[SCSI] modify change_queue_depth to take in reason why it is being calledMike Christie
This patch modifies scsi_host_template->change_queue_depth so that it takes an argument indicating why it is being called. This will be used so that if a LLD needs to do some extra processing when handling queue fulls or later ramp ups, it can do so. This is a simple port of the drivers setting a change_queue_depth callback. In the patch I just have these LLDs adjust the queue depth if the user was requesting it. Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> [Vasu.Dev: v2 Also converted pmcraid_change_queue_depth and then verified all modules compile using "make allmodconfig" for any new build warnings on X86_64. Updated original description after combing two original patches from Mike to make this patch git bisectable.] Signed-off-by: Vasu Dev <vasu.dev@intel.com> [jejb: fixed up 53c700] Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-12-04tree-wide: fix assorted typos all over the placeAndré Goddard Rosa
That is "success", "unknown", "through", "performance", "[re|un]mapping" , "access", "default", "reasonable", "[con]currently", "temperature" , "channel", "[un]used", "application", "example","hierarchy", "therefore" , "[over|under]flow", "contiguous", "threshold", "enough" and others. Signed-off-by: André Goddard Rosa <andre.goddard@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-10-29[SCSI] mptfusion: Bump version to 3.04.13Kashyap, Desai
Bump version 3.04.13. Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-10-29[SCSI] mptspi: Fix for incorrect data underrun errataKashyap, Desai
Errata: Certain conditions on the scsi bus may casue the 53C1030 to incorrectly signal a SCSI_DATA_UNDERRUN to the host. Workaround 1: For an Errata on LSI53C1030 When the length of request data and transfer data are different with result of command (READ or VERIFY), DID_SOFT_ERROR is set. Workaround 2: For potential trouble on LSI53C1030. It is checked whether the length of request data is equal to the length of transfer and residual. MEDIUM_ERROR is set by incorrect data. Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-10-29[SCSI] mptctl : Remove printk which floods unnecessary messages to ↵Kashyap, Desai
var/log/message Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-10-11headers: remove sched.h from interrupt.hAlexey Dobriyan
After m68k's task_thread_info() doesn't refer to current, it's possible to remove sched.h from interrupt.h and not break m68k! Many thanks to Heiko Carstens for allowing this. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
2009-09-22Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (34 commits) trivial: fix typo in aic7xxx comment trivial: fix comment typo in drivers/ata/pata_hpt37x.c trivial: typo in kernel-parameters.txt trivial: fix typo in tracing documentation trivial: add __init/__exit macros in drivers/gpio/bt8xxgpio.c trivial: add __init macro/ fix of __exit macro location in ipmi_poweroff.c trivial: remove unnecessary semicolons trivial: Fix duplicated word "options" in comment trivial: kbuild: remove extraneous blank line after declaration of usage() trivial: improve help text for mm debug config options trivial: doc: hpfall: accept disk device to unload as argument trivial: doc: hpfall: reduce risk that hpfall can do harm trivial: SubmittingPatches: Fix reference to renumbered step trivial: fix typos "man[ae]g?ment" -> "management" trivial: media/video/cx88: add __init/__exit macros to cx88 drivers trivial: fix typo in CONFIG_DEBUG_FS in gcov doc trivial: fix missing printk space in amd_k7_smp_check trivial: fix typo s/ketymap/keymap/ in comment trivial: fix typo "to to" in multiple files trivial: fix typos in comments s/DGBU/DBGU/ ...
2009-09-22const: make block_device_operations constAlexey Dobriyan
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-09-21trivial: fix typos "man[ae]g?ment" -> "management"Uwe Kleine-Koenig
Signed-off-by: Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-09-14Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6Linus Torvalds
* git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6: (209 commits) [SCSI] fix oops during scsi scanning [SCSI] libsrp: fix memory leak in srp_ring_free() [SCSI] libiscsi, bnx2i: make bound ep check common [SCSI] libiscsi: add completion function for drivers that do not need pdu processing [SCSI] scsi_dh_rdac: changes for rdac debug logging [SCSI] scsi_dh_rdac: changes to collect the rdac debug information during the initialization [SCSI] scsi_dh_rdac: move the init code from rdac_activate to rdac_bus_attach [SCSI] sg: fix oops in the error path in sg_build_indirect() [SCSI] mptsas : Bump version to 3.04.12 [SCSI] mptsas : FW event thread and scsi mid layer deadlock in SYNCHRONIZE CACHE command [SCSI] mptsas : Send DID_NO_CONNECT for pending IOs of removed device [SCSI] mptsas : PAE Kernel more than 4 GB kernel panic [SCSI] mptsas : NULL pointer on big endian systems causing Expander not to tear off [SCSI] mptsas : Sanity check for phyinfo is added [SCSI] scsi_dh_rdac: Add support for Sun StorageTek ST2500, ST2510 and ST2530 [SCSI] pmcraid: PMC-Sierra MaxRAID driver to support 6Gb/s SAS RAID controller [SCSI] qla2xxx: Update version number to 8.03.01-k6. [SCSI] qla2xxx: Properly delete rports attached to a vport. [SCSI] qla2xxx: Correct various NPIV issues. [SCSI] qla2xxx: Correct qla2x00_eh_wait_on_command() to wait correctly. ...
2009-09-12[SCSI] mptsas : Bump version to 3.04.12Kashyap, Desai
Bump version to 3.04.12 Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-09-12[SCSI] mptsas : FW event thread and scsi mid layer deadlock in SYNCHRONIZE ↵Kashyap, Desai
CACHE command Normally In HBA reset path MPT driver will flush existing work in current work queue (mpt/0) . This is just a dummy activity for MPT driver point of view, since HBA reset will turn off Work queue events. It means we will simply returns from work queue without doing anything. But for the case where Work is already done (half the way), we have to have that work to be done. Considering above condition we stuck forever since Deadlock in scsi midlayer and MPT driver. sd_sync_cache() will wait forever since HBA is not in Running state, and it will never come into Running state since sd_sync_cache() is called from HBA reset context. Now new code will not wait for half cooked work to be finished before returning from HBA reset. Once we are out of HBA reset, EH thread will change host state to running from recovery and work waiting for running state of HBA will be finished. New code is turning ON firmware event from another special work called Rescan toplogy. Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-09-12[SCSI] mptsas : Send DID_NO_CONNECT for pending IOs of removed deviceKashyap, Desai
Driver is modified to return DID_NO_CONNECT for all pending I/O requests for bus type SAS, if it founds the target is removed at the firmware level. Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-09-12[SCSI] mptsas : PAE Kernel more than 4 GB kernel panicKashyap, Desai
This patch is solving problem for PAE kernel DMA operation. On PAE system dma_addr and unsigned long will have different values. Now dma_addr is not type casted using unsigned long. Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-09-12[SCSI] mptsas : NULL pointer on big endian systems causing Expander not to ↵Kashyap, Desai
tear off On Big endian system kernel will crash due to address translation is not handle properly. Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-09-12[SCSI] mptsas : Sanity check for phyinfo is addedKashyap, Desai
Check for phyinfo->phy before calling sas_port_delete_phy. Signed-off-by: Kashyap Desai <kashyap.desai@lsi.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-08-22[SCSI] mptsas : Bump version to 3.04.11Kashyap, Desai
Bump version to 3.04.11 Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-08-22[SCSI] mptsas : Code cleanup of host page alloc and diag reset.Kashyap, Desai
Code cleanup of host page alloc and diag reset. Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-08-22[SCSI] mptsas : set max_id to infinite value.Kashyap, Desai
Do not set max_id value received from FW. Once SAS transport layer is introduced max_id value is missleading to SCSI mid layer. Use max_id to infinite value. logic of can queue of scsi host is changed. Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-08-22[SCSI] mptsas : Change config request timeout value to 30 seconds.Kashyap, Desai
Change config request timeout value to 30 seconds. Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-08-22[SCSI] mptsas : Handle INSUFFICIENT resources status as similar to IOC BUSY ↵Kashyap, Desai
status Handle insufficient resources status as similar to busy status. Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-08-22[SCSI] mptsas : Removed mptscsih_timer_expired.Kashyap, Desai
Removed mptscsih_timer_expired. This timer is no more use. Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-08-22[SCSI] mptsas : Change DEFINED value of can queue for FC and SAS devices.Kashyap, Desai
Change DEFINED value of can queue for FC and SAS devices. Signed-off-by: James Bottomley <James.Bottomley@suse.de>
2009-07-05net: use NETDEV_TX_OK instead of 0 in ndo_start_xmit() functionsPatrick McHardy
This patch is the result of an automatic spatch transformation to convert all ndo_start_xmit() return values of 0 to NETDEV_TX_OK. Some occurences are missed by the automatic conversion, those will be handled in a seperate patch. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-06-22fusion: mptsas, fix lock imbalanceJiri Slaby
Fix two typos in mptsas_not_responding_devices. It was mutex_lock instead of unlock. Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Acked-by: "Desai, Kashyap" <Kashyap.Desai@lsi.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2009-06-19convert some DMA_nnBIT_MASK() callersAndrew Morton
We're about to make DMA_nnBIT_MASK() emit `deprecated' warnings. Convert the remaining stragglers which are visible to the x86_64 build. Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Cc: Eric Moore <Eric.Moore@lsil.com> Cc: Takashi Iwai <tiwai@suse.de> Cc: "David S. Miller" <davem@davemloft.net> Cc: Alexander Duyck <alexander.h.duyck@intel.com> Cc: Yi Zou <yi.zou@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-06-15Merge branch 'master' of ↵David S. Miller
master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6 Conflicts: Documentation/feature-removal-schedule.txt drivers/scsi/fcoe/fcoe.c net/core/drop_monitor.c net/core/net-traces.c
2009-06-14fusion: fix recent kernel-doc problemsRandy Dunlap
Fix recent fusion driver kernel-doc fatal error and warnings. Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Cc: Eric.Moore@lsi.com Cc: support@lsi.com Cc: DL-MPTFusionLinux@lsi.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-06-14Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (31 commits) trivial: remove the trivial patch monkey's name from SubmittingPatches trivial: Fix a typo in comment of addrconf_dad_start() trivial: usb: fix missing space typo in doc trivial: pci hotplug: adding __init/__exit macros to sgi_hotplug trivial: Remove the hyphen from git commands trivial: fix ETIMEOUT -> ETIMEDOUT typos trivial: Kconfig: .ko is normally not included in module names trivial: SubmittingPatches: fix typo trivial: Documentation/dell_rbu.txt: fix typos trivial: Fix Pavel's address in MAINTAINERS trivial: ftrace:fix description of trace directory trivial: unnecessary (void*) cast removal in sound/oss/msnd.c trivial: input/misc: Fix typo in Kconfig trivial: fix grammo in bus_for_each_dev() kerneldoc trivial: rbtree.txt: fix rb_entry() parameters in sample code trivial: spelling fix in ppc code comments trivial: fix typo in bio_alloc kernel doc trivial: Documentation/rbtree.txt: cleanup kerneldoc of rbtree.txt trivial: Miscellaneous documentation typo fixes trivial: fix typo milisecond/millisecond for documentation and source comments. ...
2009-06-13net: use symbolic values for ndo_start_xmit() return codesPatrick McHardy
Convert magic values 1 and -1 to NETDEV_TX_BUSY and NETDEV_TX_LOCKED respectively. 0 (NETDEV_TX_OK) is not changed to keep the noise down, except in very few cases where its in direct proximity to one of the other values. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-06-12trivial: Miscellaneous documentation typo fixesMatt LaPlante
Fix various typos in documentation txts. Signed-off-by: Matt LaPlante <kernel1@cyberdogtech.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2009-06-12[SCSI] Merge branch 'linus'James Bottomley
Conflicts: drivers/message/fusion/mptsas.c fixed up conflict between req->data_len accessors and mptsas driver updates. Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2009-06-09[SCSI] mpt fusion: fix up doc book commentsJames Bottomley
Several of the doc book in the previous patches had incorrect multi-line short function descriptors. Fixed it all to be the correct single line descriptor. Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2009-06-09[SCSI] mpt fusion: Added support for Broadcast primitives Event handlingKashyap, Desai
Firmware is able to handle Broadcast primitives, but upstream driver does not have support for broadcast primitive handling. Now this patch is mainly to support broadcast primitives. Signed-off-by: Kashyap Desai <kadesai@lsi.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2009-06-09[SCSI] mpt fusion: Queue full event handlingKashyap, Desai
FW will report Queue full event to Driver and driver will handle this queue full event to SCSI Mid layer. Signed-off-by: Kashyap Desai <kadesai@lsi.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2009-06-09[SCSI] mpt fusion: RAID device handling and Dual port Raid support is addedKashyap, Desai
1. Handle integrated Raid device(Add/Delete) and error condition and check related to Raid device. is_logical_volume will represent logical volume device. 2. Raid device dual port support is added. Main functions to support this feature are mpt_raid_phys_disk_get_num_paths and mpt_raid_phys_disk_pg1. Signed-off-by: Kashyap Desai <kadesai@lsi.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2009-06-09[SCSI] mpt fusion: Put IOC into ready state if it not already in ready stateKashyap, Desai
Signed-off-by: Kashyap Desai <kadesai@lsi.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2009-06-09[SCSI] mpt fusion: Code Cleanup patchKashyap, Desai
Resending patch considering Grants G's code review. Main goal to submit this patch is code cleaup. 1. Better driver debug prints and code indentation. 2. fault_reset_work_lock is not used anywhere. driver is using taskmgmt_lock instead of fault_reset_work_lock. 3. setting pci_set_drvdata properly. 4. Ingore config request when IOC is in reset state.( ioc_reset_in_progress is set). 5. Init/clear managment frame proprely.(INITIALIZE_MGMT_STATUS and CLEAR_MGMT_STATUS) Signed-off-by: Kashyap Desai <kadesai@lsi.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2009-06-09[SCSI] mpt fusion: Rescan SAS topology addedKashyap, Desai
1.) SAS topology Rescan is added. If Firmware is doing Reset and we get Device add interrupt from Firmware, we will not receive it as part of Reset is going ON. After Reset we will do special Rescan of SAS topology. 2.) Driver version changed from 3.04.08 to 3.04.09. Added proper lock/unlock in mptsas_not_responding_devices() as per James' comment. Signed-off-by: Kashyap Desai <kadesai@lsi.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2009-06-09[SCSI] mpt fusion: SAS topology scan changes, expander eventsKashyap, Desai
SAS topology scan is restructured. HBA firmware is generating more events. Expander Events are added, Link status events are also added with respect to SAS topology scan optimization. Signed-off-by: Kashyap Desai <kadesai@lsi.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2009-06-09[SCSI] mpt fusion: Firmware event implementation using seperate WorkQueueKashyap, Desai
Now Firmware events are handled by firmware event queue. Previously it was handled in interrupt context/WorkQueue of Linux. Firmware Event handling is restructured and optimized. Signed-off-by: Kashyap Desai <kadesai@lsi.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2009-06-09[SCSI] mpt fusion: rewrite of ioctl_cmds internal generated functionKashyap, Desai
1) rewrite of ioctl_cmds internal generated function that issue commands to firmware, porting them to be single threaded using the generic MPT_MGMT struct. All wait Queues are replace by completion Queue. 2) added seperate callback handler for ioctl task managment (mptctl_taskmgmt_reply), to handle command that timeout 3) rewrite mptctl_bus_reset Signed-off-by: Kashyap Desai <kadesai@lsi.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2009-06-09[SCSI] mpt fusion: Adding DeviceResetCtx for internal Device reset frameKashyap, Desai
1.) Added taskmgmt_quiesce_io flag in IOC and removed resetPending from _MPT_SCSI_HOST struct. 2.) Reset from Scsi mid layer and internal Reset are seperate context. Adding DeviceResetCtx for internal Device reset frame. mptsas_taskmgmt_complete is optimized as part of implementation. Signed-off-by: Kashyap Desai <kadesai@lsi.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2009-06-09[SCSI] mpt fusion: rewrite taskmgmt request and completion routinesKashyap, Desai
1.) rewrite taskmanagement request and completion routines, making them single threaded and using the generic MPT_MGMT struct, deleting mptscsih_TMHandler, replacing with single request TM handler mptscsih_IssueTaskMgmt, and killing the watchdog timer functions. 2.) cleanup ioc_reset callback handlers, introducing wrappers for synchronizing error recovery (mpt_set_taskmgmt_in_progress_flag, mpt_clear_taskmgmt_in_progress_flag), as the fusion firmware only handles one task management request at a time Signed-off-by: Kashyap Desai <kadesai@lsi.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2009-06-09[SCSI] mpt fusion: rewrite of all internal generated functionsKashyap, Desai
Rewrite of all internal generated functions that issue commands to firmware, porting them to be single threaded using the generic MPT_MGMT struct. Implemented using completion Queue. Signed-off-by: Kashyap Desai <kadesai@lsi.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2009-06-09[SCSI] mpt fusion: config path optimized, completion queue is usedKashyap, Desai
1) Previously we had mutliple #defines to use same values. Now those #defines are optimized. MPT_IOCTL_STATUS_* is removed and MPT_MGMT_STATUS_* are new #defines. 2.) config path is optimized. Instead of wait Queue and timer, using completion Q. 3.) mpt_timer_expired is not used. [jejb: elide patch to eliminate mpt_timer_expired] Signed-off-by: Kashyap Desai <kadesai@lsi.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2009-06-09[SCSI] mpt fusion: Optimized SendEvent notification Using Doorbell instead FIFOKashyap, Desai
SendEventNotification was handled through FIFO, now it is using doorbell to communicate with hardware. Added Sleep Flag as an extra argument to support Can-Sleep feature. Resending patch including compilation error fix reviewed by Grant Grundler. Signed-off-by: Kashyap Desai <kadesai@lsi.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2009-06-09[SCSI] mpt fusion: Added support for MPT discovery completion checkKashyap, Desai
sas_discovery_quiesce_io flag is used to control IO start/resume functionality. IO will be stoped while doing discovery of topology. Once discovery is completed It will resume IO. Resending patch including James review. Signed-off-by: Kashyap Desai <kadesai@lsi.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>