We should peek mbox channels when we are left with no free
sba_requests in sba_alloc_request()
Signed-off-by: Anup Patel <anup.patel@xxxxxxxxxxxx>
Reviewed-by: Ray Jui <ray.jui@xxxxxxxxxxxx>
Reviewed-by: Scott Branden <scott.branden@xxxxxxxxxxxx>
---
drivers/dma/bcm-sba-raid.c | 25 ++++++++++++++++++++-----
1 file changed, 20 insertions(+), 5 deletions(-)
diff --git a/drivers/dma/bcm-sba-raid.c b/drivers/dma/bcm-sba-raid.c
index 6d15fed..321420b 100644
--- a/drivers/dma/bcm-sba-raid.c
+++ b/drivers/dma/bcm-sba-raid.c
@@ -199,6 +199,14 @@ static inline u32 __pure sba_cmd_pq_c_mdata(u32 d, u32 b1, u32 b0)
/* ====== General helper routines ===== */
+static void sba_peek_mchans(struct sba_device *sba)
+{
+ int mchan_idx;
+
+ for (mchan_idx = 0; mchan_idx < sba->mchans_count; mchan_idx++)
+ mbox_client_peek_data(sba->mchans[mchan_idx]);
+}
+
static struct sba_request *sba_alloc_request(struct sba_device *sba)
{
unsigned long flags;
@@ -210,8 +218,17 @@ static struct sba_request *sba_alloc_request(struct sba_device *sba)
if (req)
list_move_tail(&req->node, &sba->reqs_alloc_list);
spin_unlock_irqrestore(&sba->reqs_lock, flags);
- if (!req)
+
+ if (!req) {
+ /*
+ * We have no more free requests so, we peek
+ * mailbox channels hoping few active requests
+ * would have completed which will create more
+ * room for new requests.
+ */
+ sba_peek_mchans(sba);
return NULL;
+ }
req->flags = SBA_REQUEST_STATE_ALLOCED;
req->first = req;
@@ -558,17 +575,15 @@ static enum dma_status sba_tx_status(struct dma_chan *dchan,
dma_cookie_t cookie,
struct dma_tx_state *txstate)
{
- int mchan_idx;
enum dma_status ret;
struct sba_device *sba = to_sba_device(dchan);
- for (mchan_idx = 0; mchan_idx < sba->mchans_count; mchan_idx++)
- mbox_client_peek_data(sba->mchans[mchan_idx]);
-
ret = dma_cookie_status(dchan, cookie, txstate);
if (ret == DMA_COMPLETE)
return ret;
+ sba_peek_mchans(sba);
+
return dma_cookie_status(dchan, cookie, txstate);
}
--
2.7.4
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