netdev - [RFC PATCH net-next 2/9] gve: Make the RX free queue funcs idempotent

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Message-ID: <20240418195159.3461151-3-shailend@google.com>
Date: Thu, 18 Apr 2024 19:51:52 +0000
From: Shailend Chand <shailend@...gle.com>
To: netdev@...r.kernel.org
Cc: almasrymina@...gle.com, davem@...emloft.net, edumazet@...gle.com, 
	kuba@...nel.org, pabeni@...hat.com, willemb@...gle.com, 
	Shailend Chand <shailend@...gle.com>
Subject: [RFC PATCH net-next 2/9] gve: Make the RX free queue funcs idempotent

Although this is not fixing any existing double free bug, making these
functions idempotent allows for a simpler implementation of future ndo
hooks that act on a single queue.

Signed-off-by: Shailend Chand <shailend@...gle.com>
---
 drivers/net/ethernet/google/gve/gve_rx.c | 29 ++++++++++++++++--------
 1 file changed, 19 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/google/gve/gve_rx.c b/drivers/net/ethernet/google/gve/gve_rx.c
index cd727e55ae0f..fde7503940f7 100644
--- a/drivers/net/ethernet/google/gve/gve_rx.c
+++ b/drivers/net/ethernet/google/gve/gve_rx.c
@@ -30,6 +30,9 @@ static void gve_rx_unfill_pages(struct gve_priv *priv,
 	u32 slots = rx->mask + 1;
 	int i;
 
+	if (!rx->data.page_info)
+		return;
+
 	if (rx->data.raw_addressing) {
 		for (i = 0; i < slots; i++)
 			gve_rx_free_buffer(&priv->pdev->dev, &rx->data.page_info[i],
@@ -70,20 +73,26 @@ static void gve_rx_free_ring_gqi(struct gve_priv *priv, struct gve_rx_ring *rx,
 	int idx = rx->q_num;
 	size_t bytes;
 
-	bytes = sizeof(struct gve_rx_desc) * cfg->ring_size;
-	dma_free_coherent(dev, bytes, rx->desc.desc_ring, rx->desc.bus);
-	rx->desc.desc_ring = NULL;
+	if (rx->desc.desc_ring) {
+		bytes = sizeof(struct gve_rx_desc) * cfg->ring_size;
+		dma_free_coherent(dev, bytes, rx->desc.desc_ring, rx->desc.bus);
+		rx->desc.desc_ring = NULL;
+	}
 
-	dma_free_coherent(dev, sizeof(*rx->q_resources),
-			  rx->q_resources, rx->q_resources_bus);
-	rx->q_resources = NULL;
+	if (rx->q_resources) {
+		dma_free_coherent(dev, sizeof(*rx->q_resources),
+				  rx->q_resources, rx->q_resources_bus);
+		rx->q_resources = NULL;
+	}
 
 	gve_rx_unfill_pages(priv, rx, cfg);
 
-	bytes = sizeof(*rx->data.data_ring) * slots;
-	dma_free_coherent(dev, bytes, rx->data.data_ring,
-			  rx->data.data_bus);
-	rx->data.data_ring = NULL;
+	if (rx->data.data_ring) {
+		bytes = sizeof(*rx->data.data_ring) * slots;
+		dma_free_coherent(dev, bytes, rx->data.data_ring,
+				  rx->data.data_bus);
+		rx->data.data_ring = NULL;
+	}
 
 	kvfree(rx->qpl_copy_pool);
 	rx->qpl_copy_pool = NULL;
-- 
2.44.0.769.g3c40516874-goog