netdev - [PATCH net-next] net: ethernet: ti: am65-cpsw: Handle -EPROBE

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Date:   Wed, 18 Jan 2023 16:51:36 +0530
From:   Siddharth Vadapalli <s-vadapalli@...com>
To:     <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <linux@...linux.org.uk>, <pabeni@...hat.com>, <rogerq@...nel.org>,
        <geert@...ux-m68k.org>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <srk@...com>,
        <s-vadapalli@...com>
Subject: [PATCH net-next] net: ethernet: ti: am65-cpsw: Handle -EPROBE_DEFER for Serdes PHY

In the am65_cpsw_init_serdes_phy() function, the error handling for the
call to the devm_of_phy_get() function misses the case where the return
value of devm_of_phy_get() is ERR_PTR(-EPROBE_DEFER). Proceeding without
handling this case will result in a crash when the "phy" pointer with
this value is dereferenced by phy_init() in am65_cpsw_enable_phy().

Fix this by adding appropriate error handling code.

Reported-by: Geert Uytterhoeven <geert@...ux-m68k.org>
Fixes: dab2b265dd23 ("net: ethernet: ti: am65-cpsw: Add support for SERDES configuration")
Suggested-by: Geert Uytterhoeven <geert@...ux-m68k.org>
Signed-off-by: Siddharth Vadapalli <s-vadapalli@...com>
---
This issue has been reported at:
Link: https://lore.kernel.org/r/CAMuHMdWiXu9OJxH4mRnneC3jhqTEcYXek3kbr7svhJ3cnPPwcw@mail.gmail.com/

 drivers/net/ethernet/ti/am65-cpsw-nuss.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
index 5cac98284184..c696da89962f 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
@@ -1463,6 +1463,8 @@ static int am65_cpsw_init_serdes_phy(struct device *dev, struct device_node *por
 	phy = devm_of_phy_get(dev, port_np, name);
 	if (PTR_ERR(phy) == -ENODEV)
 		return 0;
+	if (IS_ERR(phy))
+		return PTR_ERR(phy);
 
 	/* Serdes PHY exists. Store it. */
 	port->slave.serdes_phy = phy;
-- 
2.25.1