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wcn36xx: release resources in case of error

PATCH In review Ramon Fried 2 participants 3 messages Jan 23, 2018 – Jan 25, 2018

Subsystems (3)
Networking Network drivers Qualcomm WCN36XX wireless driver
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Ramon Fried

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#0 lore raw

PATCH v2 1/1 wcn36xx: release resources in case of error

wcn36xx_dxe_init() doesn't check for the return value of wcn36xx_dxe_init_descs().
This patch releases the resources in case an error ocurred.

Change-Id I924bd7489b60243c0a0cbaa716caf924f11d7587
Signed-off-by Ramon Fried <[email protected]>
---
 drivers/net/wireless/ath/wcn36xx/dxe.c | 48 +++++++++++++++++++++++++++++-----
 1 file changed, 42 insertions(+), 6 deletions(-)
drivers/net/wireless/ath/wcn36xx/dxe.c +42 -6
index d5c810a8cc52..60bf9b25d07f 100644
@@ -236,6 +236,16 @@ static int wcn36xx_dxe_init_descs(struct device *dev, struct wcn36xx_dxe_ch *wcn
 	return 0;
 }
 
+static void wcn36xx_dxe_deinit_descs(struct device *dev, struct wcn36xx_dxe_ch *wcn_ch)
+{
+	size_t size;
+
+	size = wcn_ch->desc_num * sizeof(struct wcn36xx_dxe_desc);
+	dma_free_coherent(dev, size,
+					wcn_ch->cpu_addr,
+					wcn_ch->dma_addr);
+}
+
 static void wcn36xx_dxe_init_tx_bd(struct wcn36xx_dxe_ch *ch,
 				   struct wcn36xx_dxe_mem_pool *pool)
 {

@@ -722,7 +732,11 @@ int wcn36xx_dxe_init(struct wcn36xx *wcn)
 	/***************************************/
 	/* Init descriptors for TX LOW channel */
 	/***************************************/
-	wcn36xx_dxe_init_descs(wcn->dev, &wcn->dxe_tx_l_ch);
+	ret = wcn36xx_dxe_init_descs(wcn->dev, &wcn->dxe_tx_l_ch);
+	if (ret) {
+		dev_err(wcn->dev, "Error allocating descriptor\n");
+		return ret;
+	}
 	wcn36xx_dxe_init_tx_bd(&wcn->dxe_tx_l_ch, &wcn->data_mem_pool);
 
 	/* Write channel head to a NEXT register */

@@ -740,7 +754,12 @@ int wcn36xx_dxe_init(struct wcn36xx *wcn)
 	/***************************************/
 	/* Init descriptors for TX HIGH channel */
 	/***************************************/
-	wcn36xx_dxe_init_descs(wcn->dev, &wcn->dxe_tx_h_ch);
+	ret = wcn36xx_dxe_init_descs(wcn->dev, &wcn->dxe_tx_h_ch);
+	if (ret) {
+		dev_err(wcn->dev, "Error allocating descriptor\n");
+		goto out_err_txh_ch;
+	}
+
 	wcn36xx_dxe_init_tx_bd(&wcn->dxe_tx_h_ch, &wcn->mgmt_mem_pool);
 
 	/* Write channel head to a NEXT register */

@@ -760,7 +779,12 @@ int wcn36xx_dxe_init(struct wcn36xx *wcn)
 	/***************************************/
 	/* Init descriptors for RX LOW channel */
 	/***************************************/
-	wcn36xx_dxe_init_descs(wcn->dev, &wcn->dxe_rx_l_ch);
+	ret = wcn36xx_dxe_init_descs(wcn->dev, &wcn->dxe_rx_l_ch);
+	if (ret) {
+		dev_err(wcn->dev, "Error allocating descriptor\n");
+		goto out_err_rxl_ch;
+	}
+
 
 	/* For RX we need to preallocated buffers */
 	wcn36xx_dxe_ch_alloc_skb(wcn, &wcn->dxe_rx_l_ch);

@@ -790,7 +814,11 @@ int wcn36xx_dxe_init(struct wcn36xx *wcn)
 	/***************************************/
 	/* Init descriptors for RX HIGH channel */
 	/***************************************/
-	wcn36xx_dxe_init_descs(wcn->dev, &wcn->dxe_rx_h_ch);
+	ret = wcn36xx_dxe_init_descs(wcn->dev, &wcn->dxe_rx_h_ch);
+	if (ret) {
+		dev_err(wcn->dev, "Error allocating descriptor\n");
+		goto out_err_rxh_ch;
+	}
 
 	/* For RX we need to prealocat buffers */
 	wcn36xx_dxe_ch_alloc_skb(wcn, &wcn->dxe_rx_h_ch);

@@ -819,11 +847,19 @@ int wcn36xx_dxe_init(struct wcn36xx *wcn)
 
 	ret = wcn36xx_dxe_request_irqs(wcn);
 	if (ret < 0)
-		goto out_err;
+		goto out_err_irq;
 
 	return 0;
 
-out_err:
+out_err_irq:
+	wcn36xx_dxe_deinit_descs(wcn->dev, &wcn->dxe_rx_h_ch);
+out_err_rxh_ch:
+	wcn36xx_dxe_deinit_descs(wcn->dev, &wcn->dxe_rx_l_ch);
+out_err_rxl_ch:
+	wcn36xx_dxe_deinit_descs(wcn->dev, &wcn->dxe_tx_h_ch);
+out_err_txh_ch:
+	wcn36xx_dxe_deinit_descs(wcn->dev, &wcn->dxe_tx_l_ch);
+
 	return ret;
 }
Signature · 2 lines
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#1 lore raw
Quoted 6 lines · Ramon Fried

wcn36xx_dxe_init() doesn't check for the return value of wcn36xx_dxe_init_descs().
This patch releases the resources in case an error ocurred.

Change-Id I924bd7489b60243c0a0cbaa716caf924f11d7587
Signed-off-by Ramon Fried <[email protected]>

This compiled now, thanks. But I did some minor changes in the commit log and in indentation on the pending branch:

https://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git/commit/?h=master-pending&id=e5ff4344eab68c86e00036e937847ce89dfaeef6

drivers/net/wireless/ath/wcn36xx/dxe.c int wcn36xx_dxe_init(struct wcn36xx *wcn) · line 850

Quoted 6 lines
drivers/net/wireless/ath/wcn36xx/dxe.c +1 -1
@@ -819,11 +847,19 @@ int wcn36xx_dxe_init(struct wcn36xx *wcn)
 
 	ret = wcn36xx_dxe_request_irqs(wcn);
 	if (ret < 0)
-		goto out_err;
+		goto out_err_irq;

The recommended style is to label the err_ based what the target does, not from where they are called from. It's easier to manage the labels that way. But as this is a style issue I didn't change it.

Signature · 1 line
Kalle Valo
#2 lore raw
In reply to Ramon Fried
Quoted 5 lines · Ramon Fried

wcn36xx_dxe_init() doesn't check for the return value of wcn36xx_dxe_init_descs(), release the resources in case an error ocurred.

Signed-off-by Ramon Fried <[email protected]>
Signed-off-by Kalle Valo <[email protected]>

Patch applied to ath-next branch of ath.git, thanks.

d0bb950b9f5f wcn36xx: release DMA memory in case of error

Signature · 3 lines
https://patchwork.kernel.org/patch/10180503/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches