linux-kernel - [PATCH net v2 2/2] net: sfp: avoid EEPROM read of absent SFP module

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Date:   Thu,  6 Apr 2023 16:08:33 +0300
From:   Ivan Bornyakov <i.bornyakov@...rotek.ru>
To:     netdev@...r.kernel.org
Cc:     Ivan Bornyakov <i.bornyakov@...rotek.ru>, linux@...linux.org.uk,
        andrew@...n.ch, hkallweit1@...il.com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        linux-kernel@...r.kernel.org, system@...rotek.ru
Subject: [PATCH net v2 2/2] net: sfp: avoid EEPROM read of absent SFP module

If SFP module is not present, it is sensible to fail sfp_module_eeprom()
and sfp_module_eeprom_by_page() early to avoid excessive I2C transfers
which are garanteed to fail.

Suggested-by: Andrew Lunn <andrew@...n.ch>
Signed-off-by: Ivan Bornyakov <i.bornyakov@...rotek.ru>
---
 drivers/net/phy/sfp.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c
index 5663a184644d..6f32c2ab415d 100644
--- a/drivers/net/phy/sfp.c
+++ b/drivers/net/phy/sfp.c
@@ -2481,6 +2481,9 @@ static int sfp_module_eeprom(struct sfp *sfp, struct ethtool_eeprom *ee,
 	unsigned int first, last, len;
 	int ret;
 
+	if (!(sfp->state & SFP_F_PRESENT))
+		return -ENODEV;
+
 	if (ee->len == 0)
 		return -EINVAL;
 
@@ -2513,6 +2516,9 @@ static int sfp_module_eeprom_by_page(struct sfp *sfp,
 				     const struct ethtool_module_eeprom *page,
 				     struct netlink_ext_ack *extack)
 {
+	if (!(sfp->state & SFP_F_PRESENT))
+		return -ENODEV;
+
 	if (page->bank) {
 		NL_SET_ERR_MSG(extack, "Banks not supported");
 		return -EOPNOTSUPP;
-- 
2.39.2