linux-kernel - [PATCH 02/15] NTB: clear interrupt status register

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Message-Id: <92dbbe6f9b6a54a2169207dbff10e1dfa6f9d3b5.1580914232.git.arindam.nath@amd.com>
Date:   Wed,  5 Feb 2020 21:24:19 +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 02/15] NTB: clear interrupt status register

The interrupt status register should be cleared
by driver once the particular event is handled.
The patch fixes this.

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

diff --git a/drivers/ntb/hw/amd/ntb_hw_amd.c b/drivers/ntb/hw/amd/ntb_hw_amd.c
index 9a60f34a37c2..150e4db11485 100644
--- a/drivers/ntb/hw/amd/ntb_hw_amd.c
+++ b/drivers/ntb/hw/amd/ntb_hw_amd.c
@@ -550,6 +550,9 @@ static void amd_handle_event(struct amd_ntb_dev *ndev, int vec)
 		dev_info(dev, "event status = 0x%x.\n", status);
 		break;
 	}
+
+	/* Clear the interrupt status */
+	writel(status, mmio + AMD_INTSTAT_OFFSET);
 }
 
 static irqreturn_t ndev_interrupt(struct amd_ntb_dev *ndev, int vec)
-- 
2.17.1