From 1819e40908ee76c7219287224c22c772556c927e Mon Sep 17 00:00:00 2001 From: Xi Wang Date: Wed, 6 Jun 2018 14:07:51 +0100 Subject: [PATCH] net: hns3: Fix for VF mailbox cannot receiving PF response When the VF frequently switches the CMDQ interrupt, if the CMDQ_SRC is not cleared, the VF will not receive the new PF response after the interrupt is re-enabled, the corresponding log is as follows: [ 317.482222] hns3 0000:00:03.0: VF could not get mbx resp(=0) from PF in 500 tries [ 317.483137] hns3 0000:00:03.0: VF request to get tqp info from PF failed -5 This patch fixes this problem by clearing CMDQ_SRC before enabling interrupt and syncing pending IRQ handlers after disabling interrupt. Fixes: e2cb1dec9779 ("net: hns3: Add HNS3 VF HCL(Hardware Compatibility Layer) Support") Signed-off-by: Xi Wang Signed-off-by: Peng Li Signed-off-by: Salil Mehta Signed-off-by: David S. Miller --- drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c index bc8a5760d959..a17872aab168 100644 --- a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c +++ b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_main.c @@ -1565,6 +1565,8 @@ static int hclgevf_misc_irq_init(struct hclgevf_dev *hdev) return ret; } + hclgevf_clear_event_cause(hdev, 0); + /* enable misc. vector(vector 0) */ hclgevf_enable_vector(&hdev->misc_vector, true); @@ -1575,6 +1577,7 @@ static void hclgevf_misc_irq_uninit(struct hclgevf_dev *hdev) { /* disable misc vector(vector 0) */ hclgevf_enable_vector(&hdev->misc_vector, false); + synchronize_irq(hdev->misc_vector.vector_irq); free_irq(hdev->misc_vector.vector_irq, hdev); hclgevf_free_vector(hdev, 0); } -- 2.11.0