NTB: clear interrupt status register

amd-anath · jonmason · commit 52ba44788964 · 2020-03-13T10:04:19.000-04:00
The interrupt status register should be cleared
by driver once the particular event is handled.
The patch fixes this.

Signed-off-by: Arindam Nath &lt;arindam.nath@amd.com&gt;
Signed-off-by: Jon Mason &lt;jdmason@kudzu.us&gt;
diff --git 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)

Original file line number	Diff line number	Diff line change
`@@ -550,6 +550,9 @@ static void amd_handle_event(struct amd_ntb_dev *ndev, int vec)`
`550`	`550`	`dev_info(dev, "event status = 0x%x.\n", status);`
`551`	`551`	`break;`
`552`	`552`	`}`
	`553`	`+`
	`554`	`+ /* Clear the interrupt status */`
	`555`	`+ writel(status, mmio + AMD_INTSTAT_OFFSET);`
`553`	`556`	`}`
`554`	`557`
`555`	`558`	`static irqreturn_t ndev_interrupt(struct amd_ntb_dev *ndev, int vec)`