netdev - [net-next 09/16] ixgbevf: Check for adapter removal on register writes

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Date:	Fri, 21 Mar 2014 05:09:59 -0700
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	davem@...emloft.net
Cc:	Mark Rustad <mark.d.rustad@...el.com>, netdev@...r.kernel.org,
	gospo@...hat.com, sassmann@...hat.com,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next 09/16] ixgbevf: Check for adapter removal on register writes

From: Mark Rustad <mark.d.rustad@...el.com>

Prevent writes to an adapter that has been detected as removed
by a previous failing read.

Signed-off-by: Mark Rustad <mark.d.rustad@...el.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
 drivers/net/ethernet/intel/ixgbevf/vf.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/ixgbevf/vf.h b/drivers/net/ethernet/intel/ixgbevf/vf.h
index 7cb1a52..096d33a 100644
--- a/drivers/net/ethernet/intel/ixgbevf/vf.h
+++ b/drivers/net/ethernet/intel/ixgbevf/vf.h
@@ -178,7 +178,11 @@ struct ixgbevf_info {
 
 static inline void ixgbe_write_reg(struct ixgbe_hw *hw, u32 reg, u32 value)
 {
-	writel(value, hw->hw_addr + reg);
+	u8 __iomem *reg_addr = ACCESS_ONCE(hw->hw_addr);
+
+	if (IXGBE_REMOVED(reg_addr))
+		return;
+	writel(value, reg_addr + reg);
 }
 #define IXGBE_WRITE_REG(h, r, v) ixgbe_write_reg(h, r, v)
 
-- 
1.8.3.1

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