linux-kernel - [PATCH net] net: ethernet: microchip: lan743x: Fix memory allocation failure

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Message-ID: <20250314070227.24423-1-thangaraj.s@microchip.com>
Date: Fri, 14 Mar 2025 12:32:27 +0530
From: Thangaraj Samynathan <thangaraj.s@...rochip.com>
To: <netdev@...r.kernel.org>
CC: <bryan.whitehead@...rochip.com>, <UNGLinuxDriver@...rochip.com>,
	<andrew+netdev@...n.ch>, <davem@...emloft.net>, <edumazet@...gle.com>,
	<kuba@...nel.org>, <pabeni@...hat.com>, <linux-kernel@...r.kernel.org>
Subject: [PATCH net] net: ethernet: microchip: lan743x: Fix memory allocation failure

The driver allocates ring elements using GFP_ATOMIC and GFP_DMA
flags. The allocation is not done in atomic context and there is
no dependency from LAN743x hardware on memory allocation should be
in DMA_ZONE. Hence modifying the flags to use only GFP_KERNEL.

Signed-off-by: Thangaraj Samynathan <thangaraj.s@...rochip.com>
---
 drivers/net/ethernet/microchip/lan743x_main.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/microchip/lan743x_main.c b/drivers/net/ethernet/microchip/lan743x_main.c
index 23760b613d3e..c10b0131d5fb 100644
--- a/drivers/net/ethernet/microchip/lan743x_main.c
+++ b/drivers/net/ethernet/microchip/lan743x_main.c
@@ -2495,8 +2495,7 @@ static int lan743x_rx_process_buffer(struct lan743x_rx *rx)
 
 	/* save existing skb, allocate new skb and map to dma */
 	skb = buffer_info->skb;
-	if (lan743x_rx_init_ring_element(rx, rx->last_head,
-					 GFP_ATOMIC | GFP_DMA)) {
+	if (lan743x_rx_init_ring_element(rx, rx->last_head, GFP_KERNEL)) {
 		/* failed to allocate next skb.
 		 * Memory is very low.
 		 * Drop this packet and reuse buffer.
-- 
2.25.1