From: Emil Tantilov <emil.s.tantilov@intel.com>
Date: Fri, 8 Apr 2011 01:23:59 +0000 (+0000)
Subject: ixgbe: force unlock on timeout
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=51275d37a85bc82bda7e5b179ee520e85e66e782;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

ixgbe: force unlock on timeout

The semaphore can be in locked state upon driver load, particularly
on 82598 if a machine is rebooted due to panic and the semaphore was
acquired just prior to the panic.

This patch unlocks the semaphore if it times out.

Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
---

diff --git a/drivers/net/ixgbe/ixgbe_common.c b/drivers/net/ixgbe/ixgbe_common.c
index c4730cd39b22..b894b42a741c 100644
--- a/drivers/net/ixgbe/ixgbe_common.c
+++ b/drivers/net/ixgbe/ixgbe_common.c
@@ -1189,6 +1189,28 @@ static s32 ixgbe_get_eeprom_semaphore(struct ixgbe_hw *hw)
 		udelay(50);
 	}
 
+	if (i == timeout) {
+		hw_dbg(hw, "Driver can't access the Eeprom - SMBI Semaphore "
+		       "not granted.\n");
+		/*
+		 * this release is particularly important because our attempts
+		 * above to get the semaphore may have succeeded, and if there
+		 * was a timeout, we should unconditionally clear the semaphore
+		 * bits to free the driver to make progress
+		 */
+		ixgbe_release_eeprom_semaphore(hw);
+
+		udelay(50);
+		/*
+		 * one last try
+		 * If the SMBI bit is 0 when we read it, then the bit will be
+		 * set and we have the semaphore
+		 */
+		swsm = IXGBE_READ_REG(hw, IXGBE_SWSM);
+		if (!(swsm & IXGBE_SWSM_SMBI))
+			status = 0;
+	}
+
 	/* Now get the semaphore between SW/FW through the SWESMBI bit */
 	if (status == 0) {
 		for (i = 0; i < timeout; i++) {