linux-kernel - [PATCH] staging: vt6656: Use common error handling code in vnt_alloc

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Date:   Fri, 23 Aug 2019 15:30:11 +0200
From:   Markus Elfring <Markus.Elfring@....de>
To:     devel@...verdev.osuosl.org,
        Forest Bond <forest@...ttletooquiet.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Quentin Deslandes <quentin.deslandes@...ev.co.uk>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: [PATCH] staging: vt6656: Use common error handling code in
 vnt_alloc_bufs()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Fri, 23 Aug 2019 15:15:41 +0200

Adjust jump targets so that a bit of exception handling can be better
reused at the end of this function.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 drivers/staging/vt6656/main_usb.c | 46 +++++++++++++------------------
 1 file changed, 19 insertions(+), 27 deletions(-)

diff --git a/drivers/staging/vt6656/main_usb.c b/drivers/staging/vt6656/main_usb.c
index 856ba97aec4f..d9f14da37bbc 100644
--- a/drivers/staging/vt6656/main_usb.c
+++ b/drivers/staging/vt6656/main_usb.c
@@ -443,10 +443,8 @@ static int vnt_alloc_bufs(struct vnt_private *priv)

 	for (ii = 0; ii < priv->num_tx_context; ii++) {
 		tx_context = kmalloc(sizeof(*tx_context), GFP_KERNEL);
-		if (!tx_context) {
-			ret = -ENOMEM;
-			goto free_tx;
-		}
+		if (!tx_context)
+			goto e_nomem_tx;

 		priv->tx_context[ii] = tx_context;
 		tx_context->priv = priv;
@@ -454,20 +452,16 @@ static int vnt_alloc_bufs(struct vnt_private *priv)

 		/* allocate URBs */
 		tx_context->urb = usb_alloc_urb(0, GFP_KERNEL);
-		if (!tx_context->urb) {
-			ret = -ENOMEM;
-			goto free_tx;
-		}
+		if (!tx_context->urb)
+			goto e_nomem_tx;

 		tx_context->in_use = false;
 	}

 	for (ii = 0; ii < priv->num_rcb; ii++) {
 		priv->rcb[ii] = kzalloc(sizeof(*priv->rcb[ii]), GFP_KERNEL);
-		if (!priv->rcb[ii]) {
-			ret = -ENOMEM;
-			goto free_rx_tx;
-		}
+		if (!priv->rcb[ii])
+			goto e_nomem_rx;

 		rcb = priv->rcb[ii];

@@ -475,16 +469,12 @@ static int vnt_alloc_bufs(struct vnt_private *priv)

 		/* allocate URBs */
 		rcb->urb = usb_alloc_urb(0, GFP_KERNEL);
-		if (!rcb->urb) {
-			ret = -ENOMEM;
-			goto free_rx_tx;
-		}
+		if (!rcb->urb)
+			goto e_nomem_rx;

 		rcb->skb = dev_alloc_skb(priv->rx_buf_sz);
-		if (!rcb->skb) {
-			ret = -ENOMEM;
-			goto free_rx_tx;
-		}
+		if (!rcb->skb)
+			goto e_nomem_rx;

 		rcb->in_use = false;

@@ -495,21 +485,23 @@ static int vnt_alloc_bufs(struct vnt_private *priv)
 	}

 	priv->interrupt_urb = usb_alloc_urb(0, GFP_KERNEL);
-	if (!priv->interrupt_urb) {
-		ret = -ENOMEM;
-		goto free_rx_tx;
-	}
+	if (!priv->interrupt_urb)
+		goto e_nomem_rx;

 	priv->int_buf.data_buf = kmalloc(MAX_INTERRUPT_SIZE, GFP_KERNEL);
-	if (!priv->int_buf.data_buf) {
-		ret = -ENOMEM;
+	if (!priv->int_buf.data_buf)
 		goto free_rx_tx_urb;
-	}

 	return 0;

+e_nomem_tx:
+	ret = -ENOMEM;
+	goto free_tx;
+
 free_rx_tx_urb:
 	usb_free_urb(priv->interrupt_urb);
+e_nomem_rx:
+	ret = -ENOMEM;
 free_rx_tx:
 	vnt_free_rx_bufs(priv);
 free_tx:
--
2.23.0