[PATCH v1 14/24] net/e1000/base: fix semaphore timeout value

[Anatoly Burakov]

From: Pawel Malinowski <pawel.malinowski at intel.com>

According to datasheet software ownership of SWSM.SWESMBI bit should not
exceed 100ms. Current implementation caused incorrect timeout counter
values, where each iteration equals 50us delay. Because of that driver was
allowed to wait for semaphore even for 1,5s. This might trigger DPC
timeout.

This implementation hardcodes value to 2000, which multiplied by 50us,
gives 100ms of possible wait time.

Fixes: af75078fece3 ("first public release")
Cc: stable at dpdk.org

Signed-off-by: Pawel Malinowski <pawel.malinowski at intel.com>
Signed-off-by: Anatoly Burakov <anatoly.burakov at intel.com>
---
 drivers/net/intel/e1000/base/e1000_defines.h | 1 +
 drivers/net/intel/e1000/base/e1000_mac.c     | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/intel/e1000/base/e1000_defines.h b/drivers/net/intel/e1000/base/e1000_defines.h
index 3fbb6c8ea4..97cc2797b2 100644
--- a/drivers/net/intel/e1000/base/e1000_defines.h
+++ b/drivers/net/intel/e1000/base/e1000_defines.h
@@ -504,6 +504,7 @@
 /* SW Semaphore Register */
 #define E1000_SWSM_SMBI		0x00000001 /* Driver Semaphore bit */
 #define E1000_SWSM_SWESMBI	0x00000002 /* FW Semaphore bit */
+#define E1000_SWSM_TIMEOUT	2000       /* Driver Semaphore max timeout counter */
 #define E1000_SWSM_DRV_LOAD	0x00000008 /* Driver Loaded Bit */
 
 #define E1000_SWSM2_LOCK	0x00000002 /* Secondary driver semaphore bit */
diff --git a/drivers/net/intel/e1000/base/e1000_mac.c b/drivers/net/intel/e1000/base/e1000_mac.c
index d3b3a6bac9..cf0a9f21e1 100644
--- a/drivers/net/intel/e1000/base/e1000_mac.c
+++ b/drivers/net/intel/e1000/base/e1000_mac.c
@@ -1688,7 +1688,7 @@ s32 e1000_get_speed_and_duplex_fiber_serdes_generic(struct e1000_hw E1000_UNUSED
 s32 e1000_get_hw_semaphore_generic(struct e1000_hw *hw)
 {
 	u32 swsm;
-	s32 timeout = hw->nvm.word_size + 1;
+	s32 timeout = E1000_SWSM_TIMEOUT;
 	s32 i = 0;
 
 	DEBUGFUNC("e1000_get_hw_semaphore_generic");
-- 
2.43.5