netdev - [PATCH net-next 12/36] can: xilinx_can: Add check for NAPI Poll function

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Message-Id: <20220224082726.3000007-13-mkl@pengutronix.de>
Date:   Thu, 24 Feb 2022 09:27:02 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net, kuba@...nel.org, linux-can@...r.kernel.org,
        kernel@...gutronix.de, Srinivas Neeli <srinivas.neeli@...inx.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH net-next 12/36] can: xilinx_can: Add check for NAPI Poll function

From: Srinivas Neeli <srinivas.neeli@...inx.com>

Add check for NAPI poll function to avoid enabling interrupts
with out completing the NAPI call.

Link: https://lore.kernel.org/all/20220208162053.39896-1-srinivas.neeli@xilinx.com
Signed-off-by: Srinivas Neeli <srinivas.neeli@...inx.com>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
---
 drivers/net/can/xilinx_can.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/net/can/xilinx_can.c b/drivers/net/can/xilinx_can.c
index 1674b561c9a2..e562c5ab1149 100644
--- a/drivers/net/can/xilinx_can.c
+++ b/drivers/net/can/xilinx_can.c
@@ -1215,10 +1215,11 @@ static int xcan_rx_poll(struct napi_struct *napi, int quota)
 	}
 
 	if (work_done < quota) {
-		napi_complete_done(napi, work_done);
-		ier = priv->read_reg(priv, XCAN_IER_OFFSET);
-		ier |= xcan_rx_int_mask(priv);
-		priv->write_reg(priv, XCAN_IER_OFFSET, ier);
+		if (napi_complete_done(napi, work_done)) {
+			ier = priv->read_reg(priv, XCAN_IER_OFFSET);
+			ier |= xcan_rx_int_mask(priv);
+			priv->write_reg(priv, XCAN_IER_OFFSET, ier);
+		}
 	}
 	return work_done;
 }
-- 
2.34.1