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[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>
This commit is contained in:
Christoph Hellwig 2005-06-19 13:42:05 +02:00 committed by James Bottomley
parent b4edcbcafd
commit 8d115f845a
6 changed files with 5 additions and 43 deletions
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26
drivers/scsi/megaraid.c
View File

@ -35,6 +35,7 @@
#include <linux/blkdev.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/proc_fs.h>
#include <linux/reboot.h>
@ -4477,8 +4478,6 @@ mega_internal_command(adapter_t *adapter, lockscope_t ls, megacmd_t *mc,
scb->idx = CMDID_INT_CMDS;
scmd->state = 0;
/*
* Get the lock only if the caller has not acquired it already
*/
@ -4488,15 +4487,7 @@ mega_internal_command(adapter_t *adapter, lockscope_t ls, megacmd_t *mc,
if( ls == LOCK_INT ) spin_unlock_irqrestore(&adapter->lock, flags);
/*
* Wait till this command finishes. Do not use
* wait_event_interruptible(). It causes panic if CTRL-C is hit when
* dumping e.g., physical disk information through /proc interface.
*/
#if 0
wait_event_interruptible(adapter->int_waitq, scmd->state);
#endif
wait_event(adapter->int_waitq, scmd->state);
wait_for_completion(&adapter->int_waitq);
rval = scmd->result;
mc->status = scmd->result;
@ -4530,16 +4521,7 @@ mega_internal_done(Scsi_Cmnd *scmd)
adapter = (adapter_t *)scmd->device->host->hostdata;
scmd->state = 1; /* thread waiting for its command to complete */
/*
* See comment in mega_internal_command() routine for
* wait_event_interruptible()
*/
#if 0
wake_up_interruptible(&adapter->int_waitq);
#endif
wake_up(&adapter->int_waitq);
complete(&adapter->int_waitq);
}
@ -4861,7 +4843,7 @@ megaraid_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
}
init_MUTEX(&adapter->int_mtx);
init_waitqueue_head(&adapter->int_waitq);
init_completion(&adapter->int_waitq);
adapter->this_id = DEFAULT_INITIATOR_ID;
adapter->host->this_id = DEFAULT_INITIATOR_ID;

2
drivers/scsi/megaraid.h
View File

@ -891,7 +891,7 @@ typedef struct {
Scsi_Cmnd int_scmd;
struct semaphore int_mtx; /* To synchronize the internal
commands */
wait_queue_head_t int_waitq; /* wait queue for internal
struct completion int_waitq; /* wait queue for internal
cmds */
int has_cluster; /* cluster support on this HBA */

7
drivers/scsi/scsi.c
View File

@ -259,7 +259,6 @@ struct scsi_cmnd *scsi_get_command(struct scsi_device *dev, int gfp_mask)
memset(cmd, 0, sizeof(*cmd));
cmd->device = dev;
cmd->state = SCSI_STATE_UNUSED;
init_timer(&cmd->eh_timeout);
INIT_LIST_HEAD(&cmd->list);
spin_lock_irqsave(&dev->list_lock, flags);
@ -609,9 +608,6 @@ int scsi_dispatch_cmd(struct scsi_cmnd *cmd)
* We will use a queued command if possible, otherwise we will
* emulate the queuing and calling of completion function ourselves.
*/
cmd->state = SCSI_STATE_QUEUED;
atomic_inc(&cmd->device->iorequest_cnt);
/*
@ -764,7 +760,6 @@ void __scsi_done(struct scsi_cmnd *cmd)
* Set the serial numbers back to zero
*/
cmd->serial_number = 0;
cmd->state = SCSI_STATE_BHQUEUE;
atomic_inc(&cmd->device->iodone_cnt);
if (cmd->result)
@ -885,8 +880,6 @@ void scsi_finish_command(struct scsi_cmnd *cmd)
SCSI_LOG_MLCOMPLETE(4, printk("Notifying upper driver of completion "
"for device %d %x\n", sdev->id, cmd->result));
cmd->state = SCSI_STATE_FINISHED;
/*
* We can get here with use_sg=0, causing a panic in the upper level
*/

7
drivers/scsi/scsi_error.c
View File

@ -74,10 +74,6 @@ int scsi_eh_scmd_add(struct scsi_cmnd *scmd, int eh_flag)
spin_lock_irqsave(shost->host_lock, flags);
scsi_eh_eflags_set(scmd, eh_flag);
/*
* FIXME: Can we stop setting owner and state.
*/
scmd->state = SCSI_STATE_FAILED;
list_add_tail(&scmd->eh_entry, &shost->eh_cmd_q);
set_bit(SHOST_RECOVERY, &shost->shost_state);
shost->host_failed++;
@ -634,8 +630,6 @@ static void scsi_eh_finish_cmd(struct scsi_cmnd *scmd,
struct list_head *done_q)
{
scmd->device->host->host_failed--;
scmd->state = SCSI_STATE_BHQUEUE;
scsi_eh_eflags_clr_all(scmd);
/*
@ -1803,7 +1797,6 @@ scsi_reset_provider(struct scsi_device *dev, int flag)
scmd->request = &req;
memset(&scmd->eh_timeout, 0, sizeof(scmd->eh_timeout));
scmd->request->rq_status = RQ_SCSI_BUSY;
scmd->state = SCSI_STATE_INITIALIZING;
memset(&scmd->cmnd, '\0', sizeof(scmd->cmnd));

5
drivers/scsi/scsi_lib.c
View File

@ -145,11 +145,6 @@ int scsi_queue_insert(struct scsi_cmnd *cmd, int reason)
else if (reason == SCSI_MLQUEUE_DEVICE_BUSY)
device->device_blocked = device->max_device_blocked;
/*
* Register the fact that we own the thing for now.
*/
cmd->state = SCSI_STATE_MLQUEUE;
/*
* Decrement the counters, since these commands are no longer
* active on the host/device.

1
include/scsi/scsi_cmnd.h
View File

@ -31,7 +31,6 @@ struct scsi_cmnd {
int sc_magic;
struct scsi_device *device;
unsigned short state;
struct scsi_request *sc_request;
struct list_head list; /* scsi_cmnd participates in queue lists */