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yaml
---
r: 32821
b: refs/heads/master
c: 7b30f09
h: refs/heads/master
i:
  32819: e80d1b1
v: v3
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Jens Axboe committed Jul 25, 2006
1 parent 3b429de commit 3ad2c63
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Showing 2 changed files with 46 additions and 42 deletions.
2 changes: 1 addition & 1 deletion [refs]
Original file line number Diff line number Diff line change
@@ -1,2 +1,2 @@
---
refs/heads/master: b4e54de8d34afe7fcf08bfe91070d9dfeae6ed27
refs/heads/master: 7b30f09245d0e6868819b946b2f6879e5d3d106b
86 changes: 45 additions & 41 deletions trunk/drivers/block/cciss.c
Original file line number Diff line number Diff line change
Expand Up @@ -1233,6 +1233,50 @@ static inline void complete_buffers(struct bio *bio, int status)
}
}

static void cciss_check_queues(ctlr_info_t *h)
{
int start_queue = h->next_to_run;
int i;

/* check to see if we have maxed out the number of commands that can
* be placed on the queue. If so then exit. We do this check here
* in case the interrupt we serviced was from an ioctl and did not
* free any new commands.
*/
if ((find_first_zero_bit(h->cmd_pool_bits, NR_CMDS)) == NR_CMDS)
return;

/* We have room on the queue for more commands. Now we need to queue
* them up. We will also keep track of the next queue to run so
* that every queue gets a chance to be started first.
*/
for (i = 0; i < h->highest_lun + 1; i++) {
int curr_queue = (start_queue + i) % (h->highest_lun + 1);
/* make sure the disk has been added and the drive is real
* because this can be called from the middle of init_one.
*/
if (!(h->drv[curr_queue].queue) || !(h->drv[curr_queue].heads))
continue;
blk_start_queue(h->gendisk[curr_queue]->queue);

/* check to see if we have maxed out the number of commands
* that can be placed on the queue.
*/
if ((find_first_zero_bit(h->cmd_pool_bits, NR_CMDS)) == NR_CMDS) {
if (curr_queue == start_queue) {
h->next_to_run =
(start_queue + 1) % (h->highest_lun + 1);
break;
} else {
h->next_to_run = curr_queue;
break;
}
} else {
curr_queue = (curr_queue + 1) % (h->highest_lun + 1);
}
}
}

static void cciss_softirq_done(struct request *rq)
{
CommandList_struct *cmd = rq->completion_data;
Expand Down Expand Up @@ -1264,6 +1308,7 @@ static void cciss_softirq_done(struct request *rq)
spin_lock_irqsave(&h->lock, flags);
end_that_request_last(rq, rq->errors);
cmd_free(h, cmd, 1);
cciss_check_queues(h);
spin_unlock_irqrestore(&h->lock, flags);
}

Expand Down Expand Up @@ -2528,8 +2573,6 @@ static irqreturn_t do_cciss_intr(int irq, void *dev_id, struct pt_regs *regs)
CommandList_struct *c;
unsigned long flags;
__u32 a, a1, a2;
int j;
int start_queue = h->next_to_run;

if (interrupt_not_for_us(h))
return IRQ_NONE;
Expand Down Expand Up @@ -2588,45 +2631,6 @@ static irqreturn_t do_cciss_intr(int irq, void *dev_id, struct pt_regs *regs)
}
}

/* check to see if we have maxed out the number of commands that can
* be placed on the queue. If so then exit. We do this check here
* in case the interrupt we serviced was from an ioctl and did not
* free any new commands.
*/
if ((find_first_zero_bit(h->cmd_pool_bits, NR_CMDS)) == NR_CMDS)
goto cleanup;

/* We have room on the queue for more commands. Now we need to queue
* them up. We will also keep track of the next queue to run so
* that every queue gets a chance to be started first.
*/
for (j = 0; j < h->highest_lun + 1; j++) {
int curr_queue = (start_queue + j) % (h->highest_lun + 1);
/* make sure the disk has been added and the drive is real
* because this can be called from the middle of init_one.
*/
if (!(h->drv[curr_queue].queue) || !(h->drv[curr_queue].heads))
continue;
blk_start_queue(h->gendisk[curr_queue]->queue);

/* check to see if we have maxed out the number of commands
* that can be placed on the queue.
*/
if ((find_first_zero_bit(h->cmd_pool_bits, NR_CMDS)) == NR_CMDS) {
if (curr_queue == start_queue) {
h->next_to_run =
(start_queue + 1) % (h->highest_lun + 1);
goto cleanup;
} else {
h->next_to_run = curr_queue;
goto cleanup;
}
} else {
curr_queue = (curr_queue + 1) % (h->highest_lun + 1);
}
}

cleanup:
spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
return IRQ_HANDLED;
}
Expand Down

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