linux-kernel - [PATCH 08/15] NTB: handle link down event correctly

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Message-Id: <bff304461627e0d4b748973066b7f2d3c62b0b65.1580914232.git.arindam.nath@amd.com>
Date:   Wed,  5 Feb 2020 21:24:25 +0530
From:   Arindam Nath <arindam.nath@....com>
To:     Shyam Sundar S K <Shyam-sundar.S-k@....com>,
        Jon Mason <jdmason@...zu.us>,
        Dave Jiang <dave.jiang@...el.com>,
        Allen Hubbe <allenbh@...il.com>,
        Jiasen Lin <linjiasen@...on.cn>,
        Sanjay R Mehta <sanju.mehta@....com>
Cc:     linux-ntb@...glegroups.com, linux-kernel@...r.kernel.org,
        Arindam Nath <arindam.nath@....com>
Subject: [PATCH 08/15] NTB: handle link down event correctly

Link-Up and Link-Down are mutually exclusive events.
So when we receive a Link-Down event, we should also
clear the bitmask for Link-Up event in peer_sta.

Signed-off-by: Arindam Nath <arindam.nath@....com>
---
 drivers/ntb/hw/amd/ntb_hw_amd.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/ntb/hw/amd/ntb_hw_amd.c b/drivers/ntb/hw/amd/ntb_hw_amd.c
index e964442ae2c3..d933a1dffdc6 100644
--- a/drivers/ntb/hw/amd/ntb_hw_amd.c
+++ b/drivers/ntb/hw/amd/ntb_hw_amd.c
@@ -551,8 +551,12 @@ static void amd_handle_event(struct amd_ntb_dev *ndev, int vec)
 		dev_info(dev, "Flush is done.\n");
 		break;
 	case AMD_PEER_RESET_EVENT:
-		ndev->peer_sta |= AMD_PEER_RESET_EVENT;
-		amd_ack_smu(ndev, AMD_PEER_RESET_EVENT);
+	case AMD_LINK_DOWN_EVENT:
+		ndev->peer_sta |= status;
+		if (status == AMD_LINK_DOWN_EVENT)
+			ndev->peer_sta &= ~AMD_LINK_UP_EVENT;
+
+		amd_ack_smu(ndev, status);
 
 		/* link down first */
 		ntb_link_event(&ndev->ntb);
@@ -563,7 +567,6 @@ static void amd_handle_event(struct amd_ntb_dev *ndev, int vec)
 	case AMD_PEER_D3_EVENT:
 	case AMD_PEER_PMETO_EVENT:
 	case AMD_LINK_UP_EVENT:
-	case AMD_LINK_DOWN_EVENT:
 		ndev->peer_sta |= status;
 		amd_ack_smu(ndev, status);
 
-- 
2.17.1