bnx2x: fix possible deadlock in HC hw block

The possible deadlock (on 57710 devices only) will prevent from the
device to generate interrupts.

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>

1 files changed, 29 insertions, 8 deletions

diff --git a/drivers/net/bnx2x/bnx2x_main.c b/drivers/net/bnx2x/bnx2x_main.c
index 012c093cb432..3f49b551ff05 100644
--- a/drivers/net/bnx2x/bnx2x_main.c
+++ b/drivers/net/bnx2x/bnx2x_main.c
@@ -1111,14 +1111,19 @@ static void bnx2x_hc_int_enable(struct bnx2x *bp)
                         HC_CONFIG_0_REG_INT_LINE_EN_0 |
                         HC_CONFIG_0_REG_ATTN_BIT_EN_0);
 
-                DP(NETIF_MSG_INTR, "write %x to HC %d (addr 0x%x)\n",
-                   val, port, addr);
+                if (!CHIP_IS_E1(bp)) {
+                        DP(NETIF_MSG_INTR, "write %x to HC %d (addr 0x%x)\n",
+                           val, port, addr);
 
-                REG_WR(bp, addr, val);
+                        REG_WR(bp, addr, val);
 
-                val &= ~HC_CONFIG_0_REG_MSI_MSIX_INT_EN_0;
+                        val &= ~HC_CONFIG_0_REG_MSI_MSIX_INT_EN_0;
+                }
         }
 
+        if (CHIP_IS_E1(bp))
+                REG_WR(bp, HC_REG_INT_MASK + port*4, 0x1FFFF);
+
         DP(NETIF_MSG_INTR, "write %x to HC %d (addr 0x%x)  mode %s\n",
            val, port, addr, (msix ? "MSI-X" : (msi ? "MSI" : "INTx")));
 
@@ -1212,10 +1217,26 @@ static void bnx2x_hc_int_disable(struct bnx2x *bp)
         u32 addr = port ? HC_REG_CONFIG_1 : HC_REG_CONFIG_0;
         u32 val = REG_RD(bp, addr);
 
-        val &= ~(HC_CONFIG_0_REG_SINGLE_ISR_EN_0 |
-                 HC_CONFIG_0_REG_MSI_MSIX_INT_EN_0 |
-                 HC_CONFIG_0_REG_INT_LINE_EN_0 |
-                 HC_CONFIG_0_REG_ATTN_BIT_EN_0);
+        /*
+         * in E1 we must use only PCI configuration space to disable
+         * MSI/MSIX capablility
+         * It's forbitten to disable IGU_PF_CONF_MSI_MSIX_EN in HC block
+         */
+        if (CHIP_IS_E1(bp)) {
+                /*  Since IGU_PF_CONF_MSI_MSIX_EN still always on
+                 *  Use mask register to prevent from HC sending interrupts
+                 *  after we exit the function
+                 */
+                REG_WR(bp, HC_REG_INT_MASK + port*4, 0);
+
+                val &= ~(HC_CONFIG_0_REG_SINGLE_ISR_EN_0 |
+                         HC_CONFIG_0_REG_INT_LINE_EN_0 |
+                         HC_CONFIG_0_REG_ATTN_BIT_EN_0);
+        } else
+                val &= ~(HC_CONFIG_0_REG_SINGLE_ISR_EN_0 |
+                         HC_CONFIG_0_REG_MSI_MSIX_INT_EN_0 |
+                         HC_CONFIG_0_REG_INT_LINE_EN_0 |
+                         HC_CONFIG_0_REG_ATTN_BIT_EN_0);
 
         DP(NETIF_MSG_INTR, "write %x to HC %d (addr 0x%x)\n",
            val, port, addr);