linux-kernel - [PATCH 5.15 26/98] net: dp83822: disable rx error interrupt

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Message-Id: <20220705115618.335739835@linuxfoundation.org>
Date:   Tue,  5 Jul 2022 13:57:44 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Enguerrand de Ribaucourt 
        <enguerrand.de-ribaucourt@...oirfairelinux.com>,
        Andrew Lunn <andrew@...n.ch>, Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH 5.15 26/98] net: dp83822: disable rx error interrupt

From: Enguerrand de Ribaucourt <enguerrand.de-ribaucourt@...oirfairelinux.com>

commit 0e597e2affb90d6ea48df6890d882924acf71e19 upstream.

Some RX errors, notably when disconnecting the cable, increase the RCSR
register. Once half full (0x7fff), an interrupt flood is generated. I
measured ~3k/s interrupts even after the RX errors transfer was
stopped.

Since we don't read and clear the RCSR register, we should disable this
interrupt.

Fixes: 87461f7a58ab ("net: phy: DP83822 initial driver submission")
Signed-off-by: Enguerrand de Ribaucourt <enguerrand.de-ribaucourt@...oirfairelinux.com>
Reviewed-by: Andrew Lunn <andrew@...n.ch>
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/phy/dp83822.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/net/phy/dp83822.c
+++ b/drivers/net/phy/dp83822.c
@@ -228,8 +228,7 @@ static int dp83822_config_intr(struct ph
 		if (misr_status < 0)
 			return misr_status;
 
-		misr_status |= (DP83822_RX_ERR_HF_INT_EN |
-				DP83822_LINK_STAT_INT_EN |
+		misr_status |= (DP83822_LINK_STAT_INT_EN |
 				DP83822_ENERGY_DET_INT_EN |
 				DP83822_LINK_QUAL_INT_EN);