4.4-stable review patch. If anyone has any objections, please let me know.
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From: Sudarsana Reddy Kalluru sudarsana.kalluru@cavium.com
[ 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 --- drivers/net/ethernet/qlogic/qed/qed_main.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-)
--- a/drivers/net/ethernet/qlogic/qed/qed_main.c +++ b/drivers/net/ethernet/qlogic/qed/qed_main.c @@ -461,8 +461,16 @@ static irqreturn_t qed_single_int(int ir /* 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; }