linux-kernel - [PATCH] ixgbe: Fix unreachable retry logic in combined and byte I2C write functions

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Message-Id: <20250306101201.1938376-1-rand.sec96@gmail.com>
Date: Thu,  6 Mar 2025 13:12:00 +0300
From: Rand Deeb <rand.sec96@...il.com>
To: Tony Nguyen <anthony.l.nguyen@...el.com>,
	Przemek Kitszel <przemyslaw.kitszel@...el.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	intel-wired-lan@...ts.osuosl.org (moderated list:INTEL ETHERNET DRIVERS),
	netdev@...r.kernel.org (open list:NETWORKING DRIVERS),
	linux-kernel@...r.kernel.org (open list)
Cc: deeb.rand@...fident.ru,
	lvc-project@...uxtesting.org,
	voskresenski.stanislav@...fident.ru,
	Rand Deeb <rand.sec96@...il.com>
Subject: [PATCH] ixgbe: Fix unreachable retry logic in combined and byte I2C write functions

The current implementation of `ixgbe_write_i2c_combined_generic_int` and
`ixgbe_write_i2c_byte_generic_int` sets `max_retry` to `1`, which makes
the condition `retry < max_retry` always evaluate to `false`. This renders
the retry mechanism ineffective, as the debug message and retry logic are
never executed.

This patch increases `max_retry` to `3` in both functions, aligning them
with the retry logic in `ixgbe_read_i2c_combined_generic_int`. This
ensures that the retry mechanism functions as intended, improving
robustness in case of I2C write failures.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Rand Deeb <rand.sec96@...il.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c
index 0a03a8bb5f88..2d54828bdfbb 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_phy.c
@@ -167,7 +167,7 @@ int ixgbe_write_i2c_combined_generic_int(struct ixgbe_hw *hw, u8 addr,
 					 u16 reg, u16 val, bool lock)
 {
 	u32 swfw_mask = hw->phy.phy_semaphore_mask;
-	int max_retry = 1;
+	int max_retry = 3;
 	int retry = 0;
 	u8 reg_high;
 	u8 csum;
@@ -2285,7 +2285,7 @@ static int ixgbe_write_i2c_byte_generic_int(struct ixgbe_hw *hw, u8 byte_offset,
 					    u8 dev_addr, u8 data, bool lock)
 {
 	u32 swfw_mask = hw->phy.phy_semaphore_mask;
-	u32 max_retry = 1;
+	u32 max_retry = 3;
 	u32 retry = 0;
 	int status;
 
-- 
2.34.1