qed: Add sanity check for SIMD fastpath handler.

[ Upstream commit 3935a70968820c3994db4de7e6e1c7e814bff875 ]

Avoid calling a SIMD fastpath handler if it is NULL. The check is needed
to handle an unlikely scenario where unsolicited interrupt is destined to
a PF in INTa mode.

Fixes: fe56b9e6a ("qed: Add module with basic common support")
Signed-off-by: Sudarsana Reddy Kalluru <Sudarsana.Kalluru@cavium.com>
Signed-off-by: Ariel Elior <ariel.elior@cavium.com>
Signed-off-by: Michal Kalderon <Michal.Kalderon@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/qlogic/qed/qed_main.c b/drivers/net/ethernet/qlogic/qed/qed_main.c
index 2c95892..954f7ce 100644 (file)
--- a/drivers/net/ethernet/qlogic/qed/qed_main.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_main.c
@@ -565,8 +565,16 @@ static irqreturn_t qed_single_int(int irq, void *dev_instance)
                /* Fastpath interrupts */
                for (j = 0; j < 64; j++) {
                        if ((0x2ULL << j) & status) {
-                               hwfn->simd_proto_handler[j].func(
-                                       hwfn->simd_proto_handler[j].token);
+                               struct qed_simd_fp_handler *p_handler =
+                                       &hwfn->simd_proto_handler[j];
+
+                               if (p_handler->func)
+                                       p_handler->func(p_handler->token);
+                               else
+                                       DP_NOTICE(hwfn,
+                                                 "Not calling fastpath handler as it is NULL [handler #%d, status 0x%llx]\n",
+                                                 j, status);
+
                                status &= ~(0x2ULL << j);
                                rc = IRQ_HANDLED;
                        }