linux-kernel - [PATCH net-next 3/9] net: hns3: fix a bug caused by udelay

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Date:   Thu, 20 Dec 2018 11:52:00 +0800
From:   Peng Li <lipeng321@...wei.com>
To:     <davem@...emloft.net>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linuxarm@...wei.com>, <yisen.zhuang@...wei.com>,
        <salil.mehta@...wei.com>, <lipeng321@...wei.com>
Subject: [PATCH net-next 3/9] net: hns3: fix a bug caused by udelay

udelay() in driver may always occupancy processor. If there is only
one cpu in system, the VF driver may initialize fail when insmod
PF and VF driver in the same system. This patch use msleep() to free
cpu when VF wait PF message.

Signed-off-by: Peng Li <lipeng321@...wei.com>
---
 drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_mbx.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_mbx.c b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_mbx.c
index ef9c8e6..84653f5 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_mbx.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3vf/hclgevf_mbx.c
@@ -26,7 +26,7 @@ static int hclgevf_get_mbx_resp(struct hclgevf_dev *hdev, u16 code0, u16 code1,
 				u8 *resp_data, u16 resp_len)
 {
 #define HCLGEVF_MAX_TRY_TIMES	500
-#define HCLGEVF_SLEEP_USCOEND	1000
+#define HCLGEVF_SLEEP_USECOND	1000
 	struct hclgevf_mbx_resp_status *mbx_resp;
 	u16 r_code0, r_code1;
 	int i = 0;
@@ -43,7 +43,7 @@ static int hclgevf_get_mbx_resp(struct hclgevf_dev *hdev, u16 code0, u16 code1,
 		if (test_bit(HCLGEVF_STATE_CMD_DISABLE, &hdev->state))
 			return -EIO;
 
-		udelay(HCLGEVF_SLEEP_USCOEND);
+		usleep_range(HCLGEVF_SLEEP_USECOND, HCLGEVF_SLEEP_USECOND * 2);
 		i++;
 	}
 
-- 
1.9.1