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megaraid_sas : Host lock less mode to enabled asynchronous IO submission 

Resending the patch. Addressed the review comments from Tomas Henzl.

Megaraid_sas driver can now work in host lock less mode.
Remove host lock less as megaraid_sas driver will have safer access to raid map as described in earlier patch.

We now keep Driver Raid map copy, which will make sure
that driver will always have old or new map
Driver raid map will be replaced safely in MR_PopulateDrvRaidMap(), so there is no issue
even if IO is continue from the scsi mid layer.

There is a plan to remove "host_lock" and "hba_lock" usage from megaraid_sas in future.

Signed-off-by: Sumit Saxena <sumit.saxena@avagotech.com>
Signed-off-by: Kashyap Desai <kashyap.desai@avagotech.com>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Sumit.Saxena@avagotech.com 2014-09-12 18:57:38 +05:30 committed by Christoph Hellwig
parent 51087a8617
commit fb1a24ff65
1 changed files with 4 additions and 7 deletions
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11
drivers/scsi/megaraid/megaraid_sas_base.c
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@ -1536,7 +1536,7 @@ out_return_cmd:
* @done: Callback entry point
*/
static int
megasas_queue_command_lck(struct scsi_cmnd *scmd, void (*done) (struct scsi_cmnd *))
megasas_queue_command(struct Scsi_Host *shost, struct scsi_cmnd *scmd)
{
struct megasas_instance *instance;
unsigned long flags;
@ -1558,7 +1558,7 @@ megasas_queue_command_lck(struct scsi_cmnd *scmd, void (*done) (struct scsi_cmnd
} else {
spin_unlock_irqrestore(&instance->hba_lock, flags);
scmd->result = DID_NO_CONNECT << 16;
done(scmd);
scmd->scsi_done(scmd);
return 0;
}
}
@ -1566,7 +1566,7 @@ megasas_queue_command_lck(struct scsi_cmnd *scmd, void (*done) (struct scsi_cmnd
if (instance->adprecovery == MEGASAS_HW_CRITICAL_ERROR) {
spin_unlock_irqrestore(&instance->hba_lock, flags);
scmd->result = DID_NO_CONNECT << 16;
done(scmd);
scmd->scsi_done(scmd);
return 0;
}
@ -1577,7 +1577,6 @@ megasas_queue_command_lck(struct scsi_cmnd *scmd, void (*done) (struct scsi_cmnd
spin_unlock_irqrestore(&instance->hba_lock, flags);
scmd->scsi_done = done;
scmd->result = 0;
if (MEGASAS_IS_LOGICAL(scmd) &&
@ -1607,12 +1606,10 @@ megasas_queue_command_lck(struct scsi_cmnd *scmd, void (*done) (struct scsi_cmnd
return 0;
out_done:
done(scmd);
scmd->scsi_done(scmd);
return 0;
}
static DEF_SCSI_QCMD(megasas_queue_command)
static struct megasas_instance *megasas_lookup_instance(u16 host_no)
{
int i;