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[SCSI] advansys: Remove `done' queue

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- Move the guts of asc_scsi_done_list() into a new function, asc_scsi_done.
 - Call asc_scsi_done() in asc_isr_callback() and adv_isr_callback().  The
   comment was wrong; scsi_done cannot enable interrupts.
 - All other places which queued an scp on the done list are error paths
   for queuecommand, and so we can just call asc_scsi_done() in queuecommand
   if we receive an error.
 - We no longer need to keep a list of done requests in advansys_interrupt

Signed-off-by: Matthew Wilcox <matthew@wil.cx>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Matthew Wilcox 2007-09-09 08:56:33 -06:00 committed by James Bottomley
parent 7686f02aa8
commit 6ed1ef0786
1 changed files with 24 additions and 96 deletions
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120
drivers/scsi/advansys.c
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@ -2852,7 +2852,6 @@ typedef struct asc_board {
} dvc_cfg;
ushort asc_n_io_port; /* Number I/O ports. */
asc_queue_t active; /* Active command queue */
asc_queue_t done; /* Done command queue */
ADV_SCSI_BIT_ID_TYPE init_tidmask; /* Target init./valid mask */
struct scsi_device *device[ADV_MAX_TID + 1]; /* Mid-Level Scsi Device */
ushort reqcnt[ADV_MAX_TID + 1]; /* Starvation request count */
@ -3258,6 +3257,23 @@ static const char *advansys_info(struct Scsi_Host *shost)
return info;
}
static void asc_scsi_done(struct scsi_cmnd *scp)
{
struct asc_board *boardp = ASC_BOARDP(scp->device->host);
if (scp->use_sg)
dma_unmap_sg(boardp->dev,
(struct scatterlist *)scp->request_buffer,
scp->use_sg, scp->sc_data_direction);
else if (scp->request_bufflen)
dma_unmap_single(boardp->dev, scp->SCp.dma_handle,
scp->request_bufflen, scp->sc_data_direction);
ASC_STATS(scp->device->host, done);
scp->scsi_done(scp);
}
/*
* advansys_queuecommand() - interrupt-driven I/O entrypoint.
*
@ -3270,7 +3286,6 @@ advansys_queuecommand(struct scsi_cmnd *scp, void (*done) (struct scsi_cmnd *))
struct Scsi_Host *shost;
asc_board_t *boardp;
ulong flags;
struct scsi_cmnd *done_scp;
int asc_res, result = 0;
shost = scp->device->host;
@ -3291,9 +3306,8 @@ advansys_queuecommand(struct scsi_cmnd *scp, void (*done) (struct scsi_cmnd *))
break;
case ASC_ERROR:
default:
done_scp = asc_dequeue_list(&boardp->done, NULL, ASC_TID_ALL);
/* Interrupts could be enabled here. */
asc_scsi_done_list(done_scp);
asc_scsi_done(scp);
break;
}
spin_unlock_irqrestore(&boardp->lock, flags);
@ -3409,12 +3423,6 @@ static int advansys_reset(struct scsi_cmnd *scp)
}
/* Board lock is held. */
/*
* Dequeue all board 'done' requests. A pointer to the last request
* is returned in 'last_scp'.
*/
done_scp = asc_dequeue_list(&boardp->done, &last_scp, ASC_TID_ALL);
/*
* Dequeue all board 'active' requests for all devices and set
* the request status to DID_RESET. A pointer to the last request
@ -3548,8 +3556,6 @@ static struct scsi_host_template advansys_template = {
static irqreturn_t advansys_interrupt(int irq, void *dev_id)
{
unsigned long flags;
struct scsi_cmnd *done_scp = NULL, *last_scp = NULL;
struct scsi_cmnd *new_last_scp;
struct Scsi_Host *shost = dev_id;
asc_board_t *boardp = ASC_BOARDP(shost);
irqreturn_t result = IRQ_NONE;
@ -3577,49 +3583,13 @@ static irqreturn_t advansys_interrupt(int irq, void *dev_id)
}
}
/*
* Create a list of completed requests.
*
* If a reset request is being performed for the board, the reset
* handler will complete pending requests after it has completed.
*/
if ((boardp->flags & ASC_HOST_IN_RESET) == 0) {
ASC_DBG2(1, "advansys_interrupt: done_scp 0x%p, "
"last_scp 0x%p\n", done_scp, last_scp);
/*
* Add to the list of requests that must be completed.
*
* 'done_scp' will always be NULL on the first iteration of
* this loop. 'last_scp' is set at the same time as 'done_scp'.
*/
if (done_scp == NULL) {
done_scp = asc_dequeue_list(&boardp->done,
&last_scp, ASC_TID_ALL);
} else {
ASC_ASSERT(last_scp != NULL);
last_scp->host_scribble =
(unsigned char *)asc_dequeue_list(&boardp->
done,
&new_last_scp,
ASC_TID_ALL);
if (new_last_scp != NULL) {
ASC_ASSERT(REQPNEXT(last_scp) != NULL);
last_scp = new_last_scp;
}
}
}
spin_unlock_irqrestore(&boardp->lock, flags);
/*
* If interrupts were enabled on entry, then they
* are now enabled here.
*
* Complete all requests on the done list.
*/
asc_scsi_done_list(done_scp);
ASC_DBG(1, "advansys_interrupt: end\n");
return result;
}
@ -3836,27 +3806,11 @@ static void asc_scsi_done_list(struct scsi_cmnd *scp)
ASC_DBG(2, "asc_scsi_done_list: begin\n");
while (scp != NULL) {
asc_board_t *boardp;
ASC_DBG1(3, "asc_scsi_done_list: scp 0x%lx\n", (ulong)scp);
tscp = REQPNEXT(scp);
scp->host_scribble = NULL;
boardp = ASC_BOARDP(scp->device->host);
if (scp->use_sg)
dma_unmap_sg(boardp->dev,
(struct scatterlist *)scp->request_buffer,
scp->use_sg, scp->sc_data_direction);
else if (scp->request_bufflen)
dma_unmap_single(boardp->dev, scp->SCp.dma_handle,
scp->request_bufflen,
scp->sc_data_direction);
ASC_STATS(scp->device->host, done);
ASC_ASSERT(scp->scsi_done != NULL);
scp->scsi_done(scp);
asc_scsi_done(scp);
scp = tscp;
}
@ -3904,8 +3858,8 @@ static void asc_scsi_done_list(struct scsi_cmnd *scp)
* on the board's 'active' queue and will be completed from the
* interrupt handler.
*
* If this function returns ASC_NOERROR the request has been enqueued
* on the board's 'done' queue and must be completed by the caller.
* If this function returns ASC_ERROR the host error code has been set,
* and the called must call asc_scsi_done.
*
* If ASC_BUSY is returned the request will be returned to the midlayer
* and re-tried later.
@ -3972,7 +3926,6 @@ static int asc_execute_scsi_cmnd(struct scsi_cmnd *scp)
boardp->id, asc_dvc_varp->err_code);
ASC_STATS(scp->device->host, exe_error);
scp->result = HOST_BYTE(DID_ERROR);
asc_enqueue(&boardp->done, scp, ASC_BACK);
break;
default:
ASC_PRINT2("asc_execute_scsi_cmnd: board %d: "
@ -3980,7 +3933,6 @@ static int asc_execute_scsi_cmnd(struct scsi_cmnd *scp)
boardp->id, asc_dvc_varp->err_code);
ASC_STATS(scp->device->host, exe_unknown);
scp->result = HOST_BYTE(DID_ERROR);
asc_enqueue(&boardp->done, scp, ASC_BACK);
break;
}
} else {
@ -4011,11 +3963,6 @@ static int asc_execute_scsi_cmnd(struct scsi_cmnd *scp)
*/
return ASC_BUSY;
case ASC_ERROR:
/*
* If an error is returned, then the request has been
* queued on the board done queue. It will be completed
* by the caller.
*/
default:
ASC_DBG(1, "asc_execute_scsi_cmnd: adv_build_req "
"ASC_ERROR\n");
@ -4048,7 +3995,6 @@ static int asc_execute_scsi_cmnd(struct scsi_cmnd *scp)
boardp->id, adv_dvc_varp->err_code);
ASC_STATS(scp->device->host, exe_error);
scp->result = HOST_BYTE(DID_ERROR);
asc_enqueue(&boardp->done, scp, ASC_BACK);
break;
default:
ASC_PRINT2("asc_execute_scsi_cmnd: board %d: "
@ -4056,7 +4002,6 @@ static int asc_execute_scsi_cmnd(struct scsi_cmnd *scp)
boardp->id, adv_dvc_varp->err_code);
ASC_STATS(scp->device->host, exe_unknown);
scp->result = HOST_BYTE(DID_ERROR);
asc_enqueue(&boardp->done, scp, ASC_BACK);
break;
}
}
@ -4071,8 +4016,7 @@ static int asc_execute_scsi_cmnd(struct scsi_cmnd *scp)
* The global structures 'asc_scsi_q' and 'asc_sg_head' are
* used to build the request.
*
* If an error occurs, then queue the request on the board done
* queue and return ASC_ERROR.
* If an error occurs, then return ASC_ERROR.
*/
static int asc_build_req(asc_board_t *boardp, struct scsi_cmnd *scp)
{
@ -4098,7 +4042,6 @@ static int asc_build_req(asc_board_t *boardp, struct scsi_cmnd *scp)
"ASC_MAX_CDB_LEN %d\n", boardp->id, scp->cmd_len,
ASC_MAX_CDB_LEN);
scp->result = HOST_BYTE(DID_ERROR);
asc_enqueue(&boardp->done, scp, ASC_BACK);
return ASC_ERROR;
}
asc_scsi_q.cdbptr = &scp->cmnd[0];
@ -4167,7 +4110,6 @@ static int asc_build_req(asc_board_t *boardp, struct scsi_cmnd *scp)
dma_unmap_sg(boardp->dev, slp, scp->use_sg,
scp->sc_data_direction);
scp->result = HOST_BYTE(DID_ERROR);
asc_enqueue(&boardp->done, scp, ASC_BACK);
return ASC_ERROR;
}
@ -4274,7 +4216,6 @@ adv_build_req(asc_board_t *boardp, struct scsi_cmnd *scp,
("adv_build_req: board %d: cmd_len %d > ADV_MAX_CDB_LEN %d\n",
boardp->id, scp->cmd_len, ADV_MAX_CDB_LEN);
scp->result = HOST_BYTE(DID_ERROR);
asc_enqueue(&boardp->done, scp, ASC_BACK);
return ASC_ERROR;
}
scsiqp->cdb_len = scp->cmd_len;
@ -4342,7 +4283,6 @@ adv_build_req(asc_board_t *boardp, struct scsi_cmnd *scp,
dma_unmap_sg(boardp->dev, slp, scp->use_sg,
scp->sc_data_direction);
scp->result = HOST_BYTE(DID_ERROR);
asc_enqueue(&boardp->done, scp, ASC_BACK);
/*
* Free the 'adv_req_t' structure by adding it back
@ -4628,13 +4568,7 @@ static void asc_isr_callback(ASC_DVC_VAR *asc_dvc_varp, ASC_QDONE_INFO *qdonep)
boardp->init_tidmask |= ADV_TID_TO_TIDMASK(scp->device->id);
}
/*
* Because interrupts may be enabled by the 'struct scsi_cmnd' done
* function, add the command to the end of the board's done queue.
* The done function for the command will be called from
* advansys_interrupt().
*/
asc_enqueue(&boardp->done, scp, ASC_BACK);
asc_scsi_done(scp);
return;
}
@ -4790,13 +4724,7 @@ static void adv_isr_callback(ADV_DVC_VAR *adv_dvc_varp, ADV_SCSI_REQ_Q *scsiqp)
boardp->init_tidmask |= ADV_TID_TO_TIDMASK(scp->device->id);
}
/*
* Because interrupts may be enabled by the 'struct scsi_cmnd' done
* function, add the command to the end of the board's done queue.
* The done function for the command will be called from
* advansys_interrupt().
*/
asc_enqueue(&boardp->done, scp, ASC_BACK);
asc_scsi_done(scp);
/*
* Free all 'adv_sgblk_t' structures allocated for the request.