linux-kernel - [RFC PATCH 3/5] staging: vt6655: split device_alloc_rx

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Date:   Thu, 15 Sep 2022 22:29:34 +0200
From:   Nam Cao <namcaov@...il.com>
To:     forest@...ttletooquiet.net, gregkh@...uxfoundation.org
Cc:     namcaov@...il.com, philipp.g.hortmann@...il.com,
        linux-kernel@...r.kernel.org, linux-staging@...ts.linux.dev
Subject: [RFC PATCH 3/5] staging: vt6655: split device_alloc_rx_buf

The function device_alloc_rx_buf does 2 things: allocating rx buffer
and initializing the rx descriptor's values. Split this function into
two, with each does one job.

This split is preparation for implementing correct out-of-memory error
handling.

Signed-off-by: Nam Cao <namcaov@...il.com>
---
 drivers/staging/vt6655/device_main.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/vt6655/device_main.c b/drivers/staging/vt6655/device_main.c
index 79325a693857..27fe28156257 100644
--- a/drivers/staging/vt6655/device_main.c
+++ b/drivers/staging/vt6655/device_main.c
@@ -133,6 +133,7 @@ static int device_init_td1_ring(struct vnt_private *priv);
 static int  device_rx_srv(struct vnt_private *priv, unsigned int idx);
 static int  device_tx_srv(struct vnt_private *priv, unsigned int idx);
 static bool device_alloc_rx_buf(struct vnt_private *, struct vnt_rx_desc *);
+static void device_init_rx_desc(struct vnt_private *priv, struct vnt_rx_desc *rd);
 static void device_free_rx_buf(struct vnt_private *priv,
 			       struct vnt_rx_desc *rd);
 static void device_init_registers(struct vnt_private *priv);
@@ -615,6 +616,8 @@ static int device_init_rd0_ring(struct vnt_private *priv)
 			dev_err(&priv->pcid->dev, "can not alloc rx bufs\n");
 			ret = -ENOMEM;
 			goto err_free_rd;
+		} else {
+			device_init_rx_desc(priv, desc);
 		}
 
 		desc->next = &priv->aRD0Ring[(i + 1) % priv->opts.rx_descs0];
@@ -661,6 +664,8 @@ static int device_init_rd1_ring(struct vnt_private *priv)
 			dev_err(&priv->pcid->dev, "can not alloc rx bufs\n");
 			ret = -ENOMEM;
 			goto err_free_rd;
+		} else {
+			device_init_rx_desc(priv, desc);
 		}
 
 		desc->next = &priv->aRD1Ring[(i + 1) % priv->opts.rx_descs1];
@@ -838,7 +843,10 @@ static int device_rx_srv(struct vnt_private *priv, unsigned int idx)
 			dev_err(&priv->pcid->dev,
 				"can not allocate rx buf\n");
 			break;
+		} else {
+			device_init_rx_desc(priv, rd);
 		}
+
 		rd->rd0.owner = OWNED_BY_NIC;
 	}
 
@@ -865,15 +873,17 @@ static bool device_alloc_rx_buf(struct vnt_private *priv,
 		rd_info->skb = NULL;
 		return false;
 	}
+	return true;
+}
 
+static void device_init_rx_desc(struct vnt_private *priv, struct vnt_rx_desc *rd)
+{
 	*((unsigned int *)&rd->rd0) = 0; /* FIX cast */
 
 	rd->rd0.res_count = cpu_to_le16(priv->rx_buf_sz);
 	rd->rd0.owner = OWNED_BY_NIC;
 	rd->rd1.req_count = cpu_to_le16(priv->rx_buf_sz);
-	rd->buff_addr = cpu_to_le32(rd_info->skb_dma);
-
-	return true;
+	rd->buff_addr = cpu_to_le32(rd->rd_info->skb_dma);
 }
 
 static void device_free_rx_buf(struct vnt_private *priv,
-- 
2.25.1