DMA pl330: pl330_get_desc try more to get desc

diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
index 819328b2e3ec6083d289476a8ee4ccd6250af4f8..3310b50fafec3c3d3cc48c9052f36e288147f005 100755 (executable)
--- a/drivers/dma/pl330.c
+++ b/drivers/dma/pl330.c
@@ -2760,22 +2760,29 @@ static struct dma_pl330_desc *pl330_get_desc(struct dma_pl330_chan *pch)
        struct dma_pl330_dmac *pdmac = pch->dmac;
        u8 *peri_id = pch->chan.private;
        struct dma_pl330_desc *desc;
+       int i = 0;
 
        /* Pluck one desc from the pool of DMAC */
        desc = pluck_desc(pdmac);
 
        /* If the DMAC pool is empty, alloc new */
        if (!desc) {
-               if (!add_desc(pdmac, GFP_ATOMIC, 1))
-                       return NULL;
+               for(i = 0; i < 3; i++) {
+                       if (!add_desc(pdmac, GFP_ATOMIC, 1))
+                               continue;
 
-               /* Try again */
-               desc = pluck_desc(pdmac);
-               if (!desc) {
-                       dev_err(pch->dmac->pif.dev,
-                               "%s:%d ALERT!\n", __func__, __LINE__);
-                       return NULL;
+                       /* Try again */
+                       desc = pluck_desc(pdmac);
+                       if (!desc) {
+                               dev_err(pch->dmac->pif.dev,
+                                       "%s:%d i=%d ALERT!\n", __func__, __LINE__,i);
+                               continue;
+                       }
+                       break;
                }
+
+               if(!desc && i >= 3)
+                       return NULL;
        }
 
        /* Initialize the descriptor */