kernel/drivers/scsi/mpt2sas/mpt2sas_scsih.c, branch linux-3.1.y

SCSI: mpt2sas : Fix for memory allocation error for large host credits

2012-01-18T15:31:57Z

commit aff132d95ffe14eca96cab90597cdd010b457af7 upstream. The amount of memory required for tracking chain buffers is rather large, and when the host credit count is big, memory allocation failure occurs inside __get_free_pages. The fix is to limit the number of chains to 100,000. In addition, the number of host credits is limited to 30,000 IOs. However this limitation can be overridden this using the command line option max_queue_depth. The algorithm for calculating the reply_post_queue_depth is changed so that it is equal to (reply_free_queue_depth + 16), previously it was (reply_free_queue_depth * 2). Signed-off-by: Nagalakshmi Nandigama Signed-off-by: James Bottomley Signed-off-by: Greg Kroah-Hartman

SCSI: mpt2sas: Release spinlock for the raid device list before blocking it

2012-01-18T15:31:56Z

commit 30c43282f3d347f47f9e05199d2b14f56f3f2837 upstream. Added code to release the spinlock that is used to protect the raid device list before calling a function that can block. The blocking was causing a reschedule, and subsequently it is tried to acquire the same lock, resulting in a panic (NMI Watchdog detecting a CPU lockup). Signed-off-by: Nagalakshmi Nandigama Signed-off-by: James Bottomley Signed-off-by: Greg Kroah-Hartman

SCSI: mpt2sas: Added missing mpt2sas_base_detach call from scsih_remove context

2012-01-12T19:33:45Z

commit 9ae89b0296e275d5a556068b40b7c2557a556a85 upstream. mpt2sas_base_detach() call was removed from _scsih_remove() while doing some code shuffling. Mainly when we work on adding code for scsih_shutdown(). I have added back mpt2sas_base_detach() which will get callled from _scsih_remove(). Signed-off-by: Kashyap Desai Signed-off-by: James Bottomley

SCSI: mpt2sas: _scsih_smart_predicted_fault uses GFP_KERNEL in interrupt context

2012-01-06T22:16:54Z

commit f6a290b419a2675c4b77a6b0731cd2a64332365e upstream. _scsih_smart_predicted_fault is called in an interrupt and therefore must allocate memory using GFP_ATOMIC. Signed-off-by: Anton Blanchard Signed-off-by: James Bottomley Signed-off-by: Greg Kroah-Hartman

mpt2sas: Fix for system hang when discovery in progress

2011-11-11T17:44:24Z

commit 0167ac67ff6f35bf2364f7672c8012b0cd40277f upstream. Fix for issue : While discovery is in progress, hot unplug and hot plug of enclosure connected to the controller card is causing system to hang. When a device is in the process of being detected at driver load time then if it is removed, the device that is no longer present will not be added to the list. So the code in _scsih_probe_sas() is rearranged as such so the devices that failed to be detected are not added to the list. Signed-off-by: Nagalakshmi Nandigama Signed-off-by: James Bottomley Signed-off-by: Greg Kroah-Hartman

[SCSI] mpt2sas: WarpDrive Infinite command retries due to wrong scsi command entry in MPI message

2011-07-26T09:56:27Z

Issue: This issue is seen on LSI H/W WarpDrive SSS6200 When filed direct I/O is tried as volume I/O the scmd field in internal lookup table get cleared and because of that the retried volume I/O never gets reported as completed to SML. Result: I/O timeout and Error handling thread will kicking off Fix: Setting back the scmd in the lookup table before retrying the failed direct i/o Signed-off-by: Kashyap Desai Signed-off-by: James Bottomley

[SCSI] mpt2sas: Added DID_NO_CONNECT return when driver remove and avoid shutdown call

2011-06-29T21:16:21Z

Driver should not call shutdown call from _scsih_remove otherwise, The scsi midlayer can be deadlocked when devices are removed from the driver pci_driver->shutdown handler. Signed-off-by: Kashyap Desai Signed-off-by: James Bottomley

[SCSI] mpt2sas: fix broadcast AEN and task management issue

2011-06-29T21:15:51Z

Properly handling of target reset in multi-initiator environment Clean up in broadcast change handling: (1) Need to look at the status of each task management request, and retry the TM when there are failures. (2) Need quiescence IO so the driver doesn't take on more IO request while it's in the middle of sending TM request to firmware (3) Add support to keep track of how many pending broadcast AEN events are received while the broadcast handling is active, then loop back at the end of this routine if there were any events received. Clean up in mpt2sas_scsih_issue_tm routine: (1) Make sure proper status is returned when host reset fails (2) Clean up sanity checks near end of routine, insuring all outstanding IOs were completed. Signed-off-by: Kashyap Desai Signed-off-by: James Bottomley

[SCSI] mpt2sas: Set max_sector count from module parameter

2011-06-29T21:15:00Z

This feature is to override the default max_sectors setting at load time, taking max_sectors as an command line option when loading the driver. The setting is currently hard-coded in the driver to 8192 sectors (4MB transfers). If max_sectors is specified at load time, minimum specified setting will be 64, and the maximum is 8192. The driver will modify the setting to be on even boundary. If max_sectors is not specified, the driver will default to 8192. Signed-off-by: Kashyap Desai Signed-off-by: James Bottomley

[SCSI] mpt2sas: Fixed Big Indian Issues on 32 bit PPC

2011-06-29T21:07:00Z

This patch addresses many endian issues solved by runing sparse with the option __CHECK_ENDIAN__ turned on. Signed-off-by: Kashyap Desai Signed-off-by: James Bottomley