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[SCSI] megaraid: simplify internal command handling

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We don't use the passed in scsi command for anything, so just add a adapter-
wide internal status to go along with the internal scb that is used unter
int_mtx to pass back the return value and get rid of all the complexities
and abuse of the scsi_cmnd structure.

This gets rid of the only user of scsi_allocate_command/scsi_free_command,
which can now be removed.

[jejb: checkpatch fixes]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Adam Radford <aradford@gmail.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Christoph Hellwig
2014-02-20 14:20:59 -08:00
committed by James Bottomley
parent c38c007af0
commit 0f2bb84d2a
4 changed files with 32 additions and 150 deletions
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120
drivers/scsi/megaraid.c
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@@ -531,13 +531,6 @@ mega_build_cmd(adapter_t *adapter, Scsi_Cmnd *cmd, int *busy)
int target = 0;
int ldrv_num = 0; /* logical drive number */
/*
* filter the internal and ioctl commands
*/
if((cmd->cmnd[0] == MEGA_INTERNAL_CMD))
return (scb_t *)cmd->host_scribble;
/*
* We know what channels our logical drives are on - mega_find_card()
*/
@@ -1439,19 +1432,22 @@ mega_cmd_done(adapter_t *adapter, u8 completed[], int nstatus, int status)
cmdid = completed[i];
if( cmdid == CMDID_INT_CMDS ) { /* internal command */
/*
* Only free SCBs for the commands coming down from the
* mid-layer, not for which were issued internally
*
* For internal command, restore the status returned by the
* firmware so that user can interpret it.
*/
if (cmdid == CMDID_INT_CMDS) {
scb = &adapter->int_scb;
cmd = scb->cmd;
mbox = (mbox_t *)scb->raw_mbox;
/*
* Internal command interface do not fire the extended
* passthru or 64-bit passthru
*/
pthru = scb->pthru;
list_del_init(&scb->list);
scb->state = SCB_FREE;
}
else {
adapter->int_status = status;
complete(&adapter->int_waitq);
} else {
scb = &adapter->scb_list[cmdid];
/*
@@ -1640,25 +1636,7 @@ mega_cmd_done(adapter_t *adapter, u8 completed[], int nstatus, int status)
cmd->result |= (DID_BAD_TARGET << 16)|status;
}
/*
* Only free SCBs for the commands coming down from the
* mid-layer, not for which were issued internally
*
* For internal command, restore the status returned by the
* firmware so that user can interpret it.
*/
if( cmdid == CMDID_INT_CMDS ) { /* internal command */
cmd->result = status;
/*
* Remove the internal command from the pending list
*/
list_del_init(&scb->list);
scb->state = SCB_FREE;
}
else {
mega_free_scb(adapter, scb);
}
mega_free_scb(adapter, scb);
/* Add Scsi_Command to end of completed queue */
list_add_tail(SCSI_LIST(cmd), &adapter->completed_list);
@@ -4133,23 +4111,15 @@ mega_internal_dev_inquiry(adapter_t *adapter, u8 ch, u8 tgt,
* The last argument is the address of the passthru structure if the command
* to be fired is a passthru command
*
* lockscope specifies whether the caller has already acquired the lock. Of
* course, the caller must know which lock we are talking about.
*
* Note: parameter 'pthru' is null for non-passthru commands.
*/
static int
mega_internal_command(adapter_t *adapter, megacmd_t *mc, mega_passthru *pthru)
{
Scsi_Cmnd *scmd;
struct scsi_device *sdev;
unsigned long flags;
scb_t *scb;
int rval;
scmd = scsi_allocate_command(GFP_KERNEL);
if (!scmd)
return -ENOMEM;
/*
* The internal commands share one command id and hence are
* serialized. This is so because we want to reserve maximum number of
@@ -4160,73 +4130,45 @@ mega_internal_command(adapter_t *adapter, megacmd_t *mc, mega_passthru *pthru)
scb = &adapter->int_scb;
memset(scb, 0, sizeof(scb_t));
sdev = kzalloc(sizeof(struct scsi_device), GFP_KERNEL);
scmd->device = sdev;
memset(adapter->int_cdb, 0, sizeof(adapter->int_cdb));
scmd->cmnd = adapter->int_cdb;
scmd->device->host = adapter->host;
scmd->host_scribble = (void *)scb;
scmd->cmnd[0] = MEGA_INTERNAL_CMD;
scb->state |= SCB_ACTIVE;
scb->cmd = scmd;
scb->idx = CMDID_INT_CMDS;
scb->state |= SCB_ACTIVE | SCB_PENDQ;
memcpy(scb->raw_mbox, mc, sizeof(megacmd_t));
/*
* Is it a passthru command
*/
if( mc->cmd == MEGA_MBOXCMD_PASSTHRU ) {
if (mc->cmd == MEGA_MBOXCMD_PASSTHRU)
scb->pthru = pthru;
}
scb->idx = CMDID_INT_CMDS;
megaraid_queue_lck(scmd, mega_internal_done);
spin_lock_irqsave(&adapter->lock, flags);
list_add_tail(&scb->list, &adapter->pending_list);
/*
* Check if the HBA is in quiescent state, e.g., during a
* delete logical drive opertion. If it is, don't run
* the pending_list.
*/
if (atomic_read(&adapter->quiescent) == 0)
mega_runpendq(adapter);
spin_unlock_irqrestore(&adapter->lock, flags);
wait_for_completion(&adapter->int_waitq);
rval = scmd->result;
mc->status = scmd->result;
kfree(sdev);
mc->status = rval = adapter->int_status;
/*
* Print a debug message for all failed commands. Applications can use
* this information.
*/
if( scmd->result && trace_level ) {
if (rval && trace_level) {
printk("megaraid: cmd [%x, %x, %x] status:[%x]\n",
mc->cmd, mc->opcode, mc->subopcode, scmd->result);
mc->cmd, mc->opcode, mc->subopcode, rval);
}
mutex_unlock(&adapter->int_mtx);
scsi_free_command(GFP_KERNEL, scmd);
return rval;
}
/**
* mega_internal_done()
* @scmd - internal scsi command
*
* Callback routine for internal commands.
*/
static void
mega_internal_done(Scsi_Cmnd *scmd)
{
adapter_t *adapter;
adapter = (adapter_t *)scmd->device->host->hostdata;
complete(&adapter->int_waitq);
}
static struct scsi_host_template megaraid_template = {
.module = THIS_MODULE,
.name = "MegaRAID",