linux-kernel - [PATCH v1] drivers/net/ethernet/3com: check the return value of vortex

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Date:   Mon, 19 Sep 2022 00:36:31 -0700
From:   Li Zhong <floridsleeves@...il.com>
To:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Cc:     f.fainelli@...il.com, pabeni@...hat.com, kuba@...nel.org,
        edumazet@...gle.com, davem@...emloft.net, klassert@...nel.org,
        Li Zhong <floridsleeves@...il.com>
Subject: [PATCH v1] drivers/net/ethernet/3com: check the return value of vortex_up()

Check the return value of vortex_up(), which could be error code when
the rx ring is not full.

Signed-off-by: Li Zhong <floridsleeves@...il.com>
---
 drivers/net/ethernet/3com/3c59x.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/3com/3c59x.c b/drivers/net/ethernet/3com/3c59x.c
index ccf07667aa5e..7806c5f60ac8 100644
--- a/drivers/net/ethernet/3com/3c59x.c
+++ b/drivers/net/ethernet/3com/3c59x.c
@@ -1942,6 +1942,7 @@ vortex_error(struct net_device *dev, int status)
 	void __iomem *ioaddr = vp->ioaddr;
 	int do_tx_reset = 0, reset_mask = 0;
 	unsigned char tx_status = 0;
+	int err;
 
 	if (vortex_debug > 2) {
 		pr_err("%s: vortex_error(), status=0x%x\n", dev->name, status);
@@ -2016,7 +2017,9 @@ vortex_error(struct net_device *dev, int status)
 			/* Must not enter D3 or we can't legally issue the reset! */
 			vortex_down(dev, 0);
 			issue_and_wait(dev, TotalReset | 0xff);
-			vortex_up(dev);		/* AKPM: bug.  vortex_up() assumes that the rx ring is full. It may not be. */
+			err = vortex_up(dev);
+			if (err)
+				return;
 		} else if (fifo_diag & 0x0400)
 			do_tx_reset = 1;
 		if (fifo_diag & 0x3000) {
-- 
2.25.1