dmaengine: edma: Use common error handling code in three functions

PATCH In review SF Markus Elfring 2 participants 3 messages Oct 22, 2017 – Mar 12, 2018

Subsystems (2)

Kernel janitors dmaengine

lore

Share & tools

lore

SF Markus Elfring

author

2017-10-22 14:54 UTC #0 lore raw

PATCH 1/1 dmaengine: edma: Use common error handling code in three functions

From: Markus Elfring <[email protected]>
Date: Sun, 22 Oct 2017 16:46:34 +0200

Add a jump target so that a bit of exception handling can be better reused at the end of these functions.

This issue was detected by using the Coccinelle software.

Signed-off-by Markus Elfring <[email protected]>

---
 drivers/dma/edma.c | 45 +++++++++++++++++++++++----------------------
 1 file changed, 23 insertions(+), 22 deletions(-)

drivers/dma/edma.c +23 ~~-22~~

index a7ea20e7b8e9..c973ea97467f 100644
@@ -1091,10 +1091,9 @@ static struct dma_async_tx_descriptor *edma_prep_slave_sg(
 			echan->slot[i]  				edma_alloc_slot(echan->ecc, EDMA_SLOT_ANY);
 			if (echan->slot[i] < 0) {
-				kfree(edesc);
 				dev_err(dev, "%s: Failed to allocate slot\n",
 					__func__);
-				return NULL;
+				goto free_desc;
 			}
 		}
 	}

@@ -1110,10 +1109,8 @@ static struct dma_async_tx_descriptor *edma_prep_slave_sg(
 		ret = edma_config_pset(chan, &edesc->pset[i], src_addr,
 				       dst_addr, burst, dev_width,
 				       sg_dma_len(sg), direction);
-		if (ret < 0) {
-			kfree(edesc);
-			return NULL;
-		}
+		if (ret < 0)
+			goto free_desc;
 
 		edesc->absync = ret;
 		edesc->residue += sg_dma_len(sg);

@@ -1133,6 +1130,10 @@ static struct dma_async_tx_descriptor *edma_prep_slave_sg(
 	edesc->residue_stat = edesc->residue;
 
 	return vchan_tx_prep(&echan->vchan, &edesc->vdesc, tx_flags);
+
+free_desc:
+	kfree(edesc);
+	return NULL;
 }
 
 static struct dma_async_tx_descriptor *edma_prep_dma_memcpy(

@@ -1203,10 +1204,8 @@ static struct dma_async_tx_descriptor *edma_prep_dma_memcpy(
 
 	ret = edma_config_pset(chan, &edesc->pset[0], src, dest, 1,
 			       width, pset_len, DMA_MEM_TO_MEM);
-	if (ret < 0) {
-		kfree(edesc);
-		return NULL;
-	}
+	if (ret < 0)
+		goto free_desc;
 
 	edesc->absync = ret;

@@ -1222,10 +1221,9 @@ static struct dma_async_tx_descriptor *edma_prep_dma_memcpy(
 			echan->slot[1] = edma_alloc_slot(echan->ecc,
 							 EDMA_SLOT_ANY);
 			if (echan->slot[1] < 0) {
-				kfree(edesc);
 				dev_err(dev, "%s: Failed to allocate slot\n",
 					__func__);
-				return NULL;
+				goto free_desc;
 			}
 		}
 		dest += pset_len;

@@ -1234,16 +1232,18 @@ static struct dma_async_tx_descriptor *edma_prep_dma_memcpy(
 
 		ret = edma_config_pset(chan, &edesc->pset[1], src, dest, 1,
 				       width, pset_len, DMA_MEM_TO_MEM);
-		if (ret < 0) {
-			kfree(edesc);
-			return NULL;
-		}
+		if (ret < 0)
+			goto free_desc;
 
 		edesc->pset[1].param.opt |= ITCCHEN;
 		edesc->pset[1].param.opt |= TCINTEN;
 	}
 
 	return vchan_tx_prep(&echan->vchan, &edesc->vdesc, tx_flags);
+
+free_desc:
+	kfree(edesc);
+	return NULL;
 }
 
 static struct dma_async_tx_descriptor *edma_prep_dma_cyclic(

@@ -1334,10 +1334,9 @@ static struct dma_async_tx_descriptor *edma_prep_dma_cyclic(
 			echan->slot[i]  				edma_alloc_slot(echan->ecc, EDMA_SLOT_ANY);
 			if (echan->slot[i] < 0) {
-				kfree(edesc);
 				dev_err(dev, "%s: Failed to allocate slot\n",
 					__func__);
-				return NULL;
+				goto free_desc;
 			}
 		}

@@ -1350,10 +1349,8 @@ static struct dma_async_tx_descriptor *edma_prep_dma_cyclic(
 		ret = edma_config_pset(chan, &edesc->pset[i], src_addr,
 				       dst_addr, burst, dev_width, period_len,
 				       direction);
-		if (ret < 0) {
-			kfree(edesc);
-			return NULL;
-		}
+		if (ret < 0)
+			goto free_desc;
 
 		if (direction = DMA_DEV_TO_MEM)
 			dst_addr += period_len;

@@ -1402,6 +1399,10 @@ static struct dma_async_tx_descriptor *edma_prep_dma_cyclic(
 		edma_assign_channel_eventq(echan, EVENTQ_0);
 
 	return vchan_tx_prep(&echan->vchan, &edesc->vdesc, tx_flags);
+
+free_desc:
+	kfree(edesc);
+	return NULL;
 }
 
 static void edma_completion_handler(struct edma_chan *echan)

Signature · 1 line

2.14.2

Peter Ujfalusi

Acked-by on v1 1/1

2017-10-23 08:22 UTC #1 lore raw

Quoted 7 lines · SF Markus Elfring

From: Markus Elfring <[email protected]>
Date: Sun, 22 Oct 2017 16:46:34 +0200
Add a jump target so that a bit of exception handling can be better reused at the end of these functions.
This issue was detected by using the Coccinelle software.

Acked-by Peter Ujfalusi <[email protected]>

Quoted 120 lines

Signed-off-by Markus Elfring <[email protected]>

---
 drivers/dma/edma.c | 45 +++++++++++++++++++++++----------------------
 1 file changed, 23 insertions(+), 22 deletions(-)

drivers/dma/edma.c +19 ~~-22~~

index a7ea20e7b8e9..c973ea97467f 100644
@@ -1091,10 +1091,9 @@ static struct dma_async_tx_descriptor *edma_prep_slave_sg(
 			echan->slot[i] =
 				edma_alloc_slot(echan->ecc, EDMA_SLOT_ANY);
 			if (echan->slot[i] < 0) {
-				kfree(edesc);
 				dev_err(dev, "%s: Failed to allocate slot\n",
 					__func__);
-				return NULL;
+				goto free_desc;
 			}
 		}
 	}

@@ -1110,10 +1109,8 @@ static struct dma_async_tx_descriptor *edma_prep_slave_sg(
 		ret = edma_config_pset(chan, &edesc->pset[i], src_addr,
 				       dst_addr, burst, dev_width,
 				       sg_dma_len(sg), direction);
-		if (ret < 0) {
-			kfree(edesc);
-			return NULL;
-		}
+		if (ret < 0)
+			goto free_desc;
 
 		edesc->absync = ret;
 		edesc->residue += sg_dma_len(sg);

@@ -1133,6 +1130,10 @@ static struct dma_async_tx_descriptor *edma_prep_slave_sg(
 	edesc->residue_stat = edesc->residue;
 
 	return vchan_tx_prep(&echan->vchan, &edesc->vdesc, tx_flags);
+
+free_desc:
+	kfree(edesc);
+	return NULL;
 }
 
 static struct dma_async_tx_descriptor *edma_prep_dma_memcpy(

@@ -1203,10 +1204,8 @@ static struct dma_async_tx_descriptor *edma_prep_dma_memcpy(
 
 	ret = edma_config_pset(chan, &edesc->pset[0], src, dest, 1,
 			       width, pset_len, DMA_MEM_TO_MEM);
-	if (ret < 0) {
-		kfree(edesc);
-		return NULL;
-	}
+	if (ret < 0)
+		goto free_desc;
 
 	edesc->absync = ret;

@@ -1222,10 +1221,9 @@ static struct dma_async_tx_descriptor *edma_prep_dma_memcpy(
 			echan->slot[1] = edma_alloc_slot(echan->ecc,
 							 EDMA_SLOT_ANY);
 			if (echan->slot[1] < 0) {
-				kfree(edesc);
 				dev_err(dev, "%s: Failed to allocate slot\n",
 					__func__);
-				return NULL;
+				goto free_desc;
 			}
 		}
 		dest += pset_len;

@@ -1234,16 +1232,18 @@ static struct dma_async_tx_descriptor *edma_prep_dma_memcpy(
 
 		ret = edma_config_pset(chan, &edesc->pset[1], src, dest, 1,
 				       width, pset_len, DMA_MEM_TO_MEM);
-		if (ret < 0) {
-			kfree(edesc);
-			return NULL;
-		}
+		if (ret < 0)
+			goto free_desc;
 
 		edesc->pset[1].param.opt |= ITCCHEN;
 		edesc->pset[1].param.opt |= TCINTEN;
 	}
 
 	return vchan_tx_prep(&echan->vchan, &edesc->vdesc, tx_flags);
+
+free_desc:
+	kfree(edesc);
+	return NULL;
 }
 
 static struct dma_async_tx_descriptor *edma_prep_dma_cyclic(

@@ -1334,10 +1334,9 @@ static struct dma_async_tx_descriptor *edma_prep_dma_cyclic(
 			echan->slot[i] =
 				edma_alloc_slot(echan->ecc, EDMA_SLOT_ANY);
 			if (echan->slot[i] < 0) {
-				kfree(edesc);
 				dev_err(dev, "%s: Failed to allocate slot\n",
 					__func__);
-				return NULL;
+				goto free_desc;
 			}
 		}

@@ -1350,10 +1349,8 @@ static struct dma_async_tx_descriptor *edma_prep_dma_cyclic(
 		ret = edma_config_pset(chan, &edesc->pset[i], src_addr,
 				       dst_addr, burst, dev_width, period_len,
 				       direction);
-		if (ret < 0) {
-			kfree(edesc);
-			return NULL;
-		}
+		if (ret < 0)
+			goto free_desc;
 
 		if (direction == DMA_DEV_TO_MEM)
 			dst_addr += period_len;

drivers/dma/edma.c static struct dma_async_tx_descriptor *edma_prep_dma_cyclic( · line 1408

Quoted 10 lines

drivers/dma/edma.c +4 -0

@@ -1402,6 +1399,10 @@ static struct dma_async_tx_descriptor *edma_prep_dma_cyclic(
 		edma_assign_channel_eventq(echan, EVENTQ_0);
 
 	return vchan_tx_prep(&echan->vchan, &edesc->vdesc, tx_flags);
+
+free_desc:
+	kfree(edesc);
+	return NULL;
 }
 
 static void edma_completion_handler(struct edma_chan *echan)

- Péter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

SF Markus Elfring

author

2018-03-12 14:40 UTC #2 lore raw

In reply to SF Markus Elfring

Quoted 4 lines

Date: Sun, 22 Oct 2017 16:46:34 +0200
Add a jump target so that a bit of exception handling can be better reused at the end of these functions.

How are the chances to integrate such a change into another Linux repository?
https://lkml.org/lkml/2017/10/22/78
https://patchwork.kernel.org/patch/10021725/
https://lkml.kernel.org/r/<[email protected]>

Regards,
Markus