linux-kernel - [PATCH 5.8 176/464] dpaa2-eth: fix condition for number of buffer acquire retries

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Message-Id: <20200817143842.249705710@linuxfoundation.org>
Date:   Mon, 17 Aug 2020 17:12:09 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Ioana Ciornei <ioana.ciornei@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.8 176/464] dpaa2-eth: fix condition for number of buffer acquire retries

From: Ioana Ciornei <ioana.ciornei@....com>

[ Upstream commit 0e5ad75b02d9341eb9ca22627247f9a02cc20d6f ]

We should keep retrying to acquire buffers through the software portals
as long as the function returns -EBUSY and the number of retries is
__below__ DPAA2_ETH_SWP_BUSY_RETRIES.

Fixes: ef17bd7cc0c8 ("dpaa2-eth: Avoid unbounded while loops")
Signed-off-by: Ioana Ciornei <ioana.ciornei@....com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
index 0998ceb1a26ea..89c43401f2889 100644
--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-eth.c
@@ -1109,7 +1109,7 @@ static void drain_bufs(struct dpaa2_eth_priv *priv, int count)
 					       buf_array, count);
 		if (ret < 0) {
 			if (ret == -EBUSY &&
-			    retries++ >= DPAA2_ETH_SWP_BUSY_RETRIES)
+			    retries++ < DPAA2_ETH_SWP_BUSY_RETRIES)
 				continue;
 			netdev_err(priv->net_dev, "dpaa2_io_service_acquire() failed\n");
 			return;
-- 
2.25.1