[PATCH 5.18 032/102] net: dp83822: disable rx error interrupt

Greg Kroah-Hartman
2022-07-05T12:31:13Z

From: Enguerrand de Ribaucourt <enguerrand.de-ribaucourt@savoirfairelinux.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@savoirfairelinux.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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);