linux-kernel - [PATCH 02/20] net: stmmac: Free Rx descs on Tx allocation failure

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Message-ID: <20210208140341.9271-3-Sergey.Semin@baikalelectronics.ru>
Date:   Mon, 8 Feb 2021 17:03:23 +0300
From:   Serge Semin <Sergey.Semin@...kalelectronics.ru>
To:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Joao Pinto <Joao.Pinto@...opsys.com>,
        Jose Abreu <Jose.Abreu@...opsys.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>
CC:     Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Vyacheslav Mitrofanov 
        <Vyacheslav.Mitrofanov@...kalelectronics.ru>,
        Russell King <linux@...linux.org.uk>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        <netdev@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH 02/20] net: stmmac: Free Rx descs on Tx allocation failure

Indeed in accordance with the alloc_dma_desc_resources() method logic the
Rx descriptors will be left allocated if Tx descriptors allocation fails.
Fix it by calling the free_dma_rx_desc_resources() in case if the
alloc_dma_tx_desc_resources() method returns non-zero value.

While at it refactor the method a bit. Just move the Rx descriptors
allocation method invocation out of the local variables declaration block
and discard a pointless comment from there.

Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 03acf14d76de..5ee840525824 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -1791,13 +1791,15 @@ static int alloc_dma_tx_desc_resources(struct stmmac_priv *priv)
  */
 static int alloc_dma_desc_resources(struct stmmac_priv *priv)
 {
-	/* RX Allocation */
-	int ret = alloc_dma_rx_desc_resources(priv);
+	int ret;
 
+	ret = alloc_dma_rx_desc_resources(priv);
 	if (ret)
 		return ret;
 
 	ret = alloc_dma_tx_desc_resources(priv);
+	if (ret)
+		free_dma_rx_desc_resources(priv);
 
 	return ret;
 }
-- 
2.29.2