DMAENGINE: COH 901 318 remove irq counting
This removes the pointless irq counting for the COH 901 318, as
it turns out the hardware will only ever fire one IRQ for a linked
list anyway. In the process also a missing spinlock was introduced.
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
diff --git a/drivers/dma/coh901318.c b/drivers/dma/coh901318.c
index 12a7a15..544c462 100644
--- a/drivers/dma/coh901318.c
+++ b/drivers/dma/coh901318.c
@@ -39,7 +39,6 @@
unsigned int sg_len;
struct coh901318_lli *data;
enum dma_data_direction dir;
- int pending_irqs;
unsigned long flags;
};
@@ -72,7 +71,6 @@
unsigned long nbr_active_done;
unsigned long busy;
- int pending_irqs;
struct coh901318_base *base;
};
@@ -368,10 +366,6 @@
coh901318_desc_submit(struct coh901318_chan *cohc, struct coh901318_desc *desc)
{
list_add_tail(&desc->node, &cohc->active);
-
- BUG_ON(cohc->pending_irqs != 0);
-
- cohc->pending_irqs = desc->pending_irqs;
}
static struct coh901318_desc *
@@ -617,36 +611,30 @@
/* get first active descriptor entry from list */
cohd_fin = coh901318_first_active_get(cohc);
- BUG_ON(cohd_fin->pending_irqs == 0);
-
if (cohd_fin == NULL)
goto err;
- cohd_fin->pending_irqs--;
- cohc->completed = cohd_fin->desc.cookie;
-
- if (cohc->nbr_active_done == 0)
- return;
-
- if (!cohd_fin->pending_irqs) {
- /* release the lli allocation*/
- coh901318_lli_free(&cohc->base->pool, &cohd_fin->data);
- }
-
- dev_vdbg(COHC_2_DEV(cohc), "[%s] chan_id %d pending_irqs %d"
- " nbr_active_done %ld\n", __func__,
- cohc->id, cohc->pending_irqs, cohc->nbr_active_done);
-
- /* callback to client */
+ /* locate callback to client */
callback = cohd_fin->desc.callback;
callback_param = cohd_fin->desc.callback_param;
- if (!cohd_fin->pending_irqs) {
- coh901318_desc_remove(cohd_fin);
+ /* sign this job as completed on the channel */
+ cohc->completed = cohd_fin->desc.cookie;
- /* return desc to free-list */
- coh901318_desc_free(cohc, cohd_fin);
- }
+ /* release the lli allocation and remove the descriptor */
+ coh901318_lli_free(&cohc->base->pool, &cohd_fin->data);
+
+ /* return desc to free-list */
+ coh901318_desc_remove(cohd_fin);
+ coh901318_desc_free(cohc, cohd_fin);
+
+ spin_unlock_irqrestore(&cohc->lock, flags);
+
+ /* Call the callback when we're done */
+ if (callback)
+ callback(callback_param);
+
+ spin_lock_irqsave(&cohc->lock, flags);
/*
* If another interrupt fired while the tasklet was scheduling,
@@ -655,9 +643,7 @@
* be handled for this channel. If there happen to be more than
* one IRQ to be ack:ed, we simply schedule this tasklet again.
*/
- if (cohc->nbr_active_done)
- cohc->nbr_active_done--;
-
+ cohc->nbr_active_done--;
if (cohc->nbr_active_done) {
dev_dbg(COHC_2_DEV(cohc), "scheduling tasklet again, new IRQs "
"came in while we were scheduling this tasklet\n");
@@ -666,10 +652,8 @@
else
tasklet_schedule(&cohc->tasklet);
}
- spin_unlock_irqrestore(&cohc->lock, flags);
- if (callback)
- callback(callback_param);
+ spin_unlock_irqrestore(&cohc->lock, flags);
return;
@@ -688,16 +672,17 @@
if (!cohc->allocated)
return;
- BUG_ON(cohc->pending_irqs == 0);
+ spin_lock(&cohc->lock);
- cohc->pending_irqs--;
cohc->nbr_active_done++;
- if (cohc->pending_irqs == 0 && coh901318_queue_start(cohc) == NULL)
+ if (coh901318_queue_start(cohc) == NULL)
cohc->busy = 0;
BUG_ON(list_empty(&cohc->active));
+ spin_unlock(&cohc->lock);
+
if (cohc_chan_conf(cohc)->priority_high)
tasklet_hi_schedule(&cohc->tasklet);
else
@@ -951,6 +936,7 @@
u32 ctrl = cohc_chan_param(cohc)->ctrl_lli;
u32 ctrl_last = cohc_chan_param(cohc)->ctrl_lli_last;
unsigned long flg;
+ int ret;
if (!sgl)
goto out;
@@ -1010,13 +996,14 @@
goto err_dma_alloc;
/* initiate allocated data list */
- cohd->pending_irqs =
- coh901318_lli_fill_sg(&cohc->base->pool, data, sgl, sg_len,
- cohc_dev_addr(cohc),
- ctrl_chained,
- ctrl,
- ctrl_last,
- direction, COH901318_CX_CTRL_TC_IRQ_ENABLE);
+ ret = coh901318_lli_fill_sg(&cohc->base->pool, data, sgl, sg_len,
+ cohc_dev_addr(cohc),
+ ctrl_chained,
+ ctrl,
+ ctrl_last,
+ direction, COH901318_CX_CTRL_TC_IRQ_ENABLE);
+ if (ret)
+ goto err_lli_fill;
COH_DBG(coh901318_list_print(cohc, data));
@@ -1030,6 +1017,7 @@
spin_unlock_irqrestore(&cohc->lock, flg);
return &cohd->desc;
+ err_lli_fill:
err_dma_alloc:
err_direction:
spin_unlock_irqrestore(&cohc->lock, flg);
@@ -1121,7 +1109,6 @@
cohc->nbr_active_done = 0;
cohc->busy = 0;
- cohc->pending_irqs = 0;
spin_unlock_irqrestore(&cohc->lock, flags);
}
@@ -1148,7 +1135,6 @@
spin_lock_init(&cohc->lock);
- cohc->pending_irqs = 0;
cohc->nbr_active_done = 0;
cohc->busy = 0;
INIT_LIST_HEAD(&cohc->free);