DMAENGINE: DMA40 fix for allocation of logical channel 0

Fix for allocation failure of logical channel when event line
happens to be number 0.

Signed-off-by: Marcin Mielczarczyk <marcin.mielczarczyk@tieto.com>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

drivers/dma/ste_dma40.c

@@ -1039,11 +1039,11 @@ static int d40_validate_conf(struct d40_chan *d40c,
 }
 
 static bool d40_alloc_mask_set(struct d40_phy_res *phy, bool is_src,
-			       int log_event_line)
+			       int log_event_line, bool is_log)
 {
 	unsigned long flags;
 	spin_lock_irqsave(&phy->lock, flags);
-	if (!log_event_line) {
+	if (!is_log) {
 		/* Physical interrupts are masked per physical full channel */
 		if (phy->allocated_src == D40_ALLOC_FREE &&
 		    phy->allocated_dst == D40_ALLOC_FREE) {
@@ -1161,15 +1161,16 @@ static int d40_allocate_channel(struct d40_chan *d40c)
 			/* Find physical half channel */
 			for (i = 0; i < d40c->base->num_phy_chans; i++) {
 
-				if (d40_alloc_mask_set(&phys[i], is_src, 0))
+				if (d40_alloc_mask_set(&phys[i], is_src,
+						       0, is_log))
 					goto found_phy;
 			}
 		} else
 			for (j = 0; j < d40c->base->num_phy_chans; j += 8) {
 				int phy_num = j  + event_group * 2;
 				for (i = phy_num; i < phy_num + 2; i++) {
-					if (d40_alloc_mask_set(&phys[i],
-							       is_src, 0))
+					if (d40_alloc_mask_set(&phys[i], is_src,
+							       0, is_log))
 						goto found_phy;
 				}
 			}
@@ -1193,13 +1194,13 @@ found_phy:
 		if (is_src) {
 			for (i = phy_num; i < phy_num + 2; i++) {
 				if (d40_alloc_mask_set(&phys[i], is_src,
-						       event_line))
+						       event_line, is_log))
 					goto found_log;
 			}
 		} else {
 			for (i = phy_num + 1; i >= phy_num; i--) {
 				if (d40_alloc_mask_set(&phys[i], is_src,
-						       event_line))
+						       event_line, is_log))
 					goto found_log;
 			}
 		}