bnx2x: prevent race between undi_unload and load flows

Signed-off-by: Dmitry Kravkov <dmitry@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/bnx2x/bnx2x_main.c b/drivers/net/bnx2x/bnx2x_main.c
index 15070911154833d4e83582fe68dba67bd9e32f73..1f5467f9548ce7764521e9a7122ffbd25def5725 100644 (file)
--- a/drivers/net/bnx2x/bnx2x_main.c
+++ b/drivers/net/bnx2x/bnx2x_main.c
@@ -5798,6 +5798,12 @@ static int bnx2x_init_hw_common(struct bnx2x *bp)
 
        DP(BNX2X_MSG_MCP, "starting common init  func %d\n", BP_ABS_FUNC(bp));
 
+       /*
+        * take the UNDI lock to protect undi_unload flow from accessing
+        * registers while we're resetting the chip
+        */
+       bnx2x_acquire_hw_lock(bp, HW_LOCK_RESOURCE_UNDI);
+
        bnx2x_reset_common(bp);
        REG_WR(bp, GRCBASE_MISC + MISC_REGISTERS_RESET_REG_1_SET, 0xffffffff);
 
@@ -5808,6 +5814,8 @@ static int bnx2x_init_hw_common(struct bnx2x *bp)
        }
        REG_WR(bp, GRCBASE_MISC + MISC_REGISTERS_RESET_REG_2_SET, val);
 
+       bnx2x_release_hw_lock(bp, HW_LOCK_RESOURCE_UNDI);
+
        bnx2x_init_block(bp, BLOCK_MISC, PHASE_COMMON);
 
        if (!CHIP_IS_E1x(bp)) {