[PATCH] net: dsa: sja1105: fix speed setting for 10 MBPS
From: Colin King <hidden>
Date: 2020-05-01 13:47:44
Also in:
kernel-janitors, lkml
Subsystem:
networking drivers, networking [dsa], the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Andrew Lunn, Vladimir Oltean, Linus Torvalds
From: Colin Ian King <redacted>
The current logic for speed checking will never set the speed to 10 MBPS
because bmcr & BMCR_SPEED10 is always 0 since BMCR_SPEED10 is 0. Also
the erroneous setting where BMCR_SPEED1000 and BMCR_SPEED100 are both
set causes the speed to be 1000 MBS. Fix this by masking bps and checking
for just the expected settings of BMCR_SPEED1000, BMCR_SPEED100 and
BMCR_SPEED10 and defaulting to the unknown speed otherwise.
Addresses-Coverity: ("Logically dead code")
Fixes: ffe10e679cec ("net: dsa: sja1105: Add support for the SGMII port")
Signed-off-by: Colin Ian King <redacted>
---
drivers/net/dsa/sja1105/sja1105_main.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/drivers/net/dsa/sja1105/sja1105_main.c b/drivers/net/dsa/sja1105/sja1105_main.c
index 472f4eb20c49..59a9038cdc4e 100644
--- a/drivers/net/dsa/sja1105/sja1105_main.c
+++ b/drivers/net/dsa/sja1105/sja1105_main.c@@ -1600,6 +1600,7 @@ static const char * const sja1105_reset_reasons[] = { int sja1105_static_config_reload(struct sja1105_private *priv, enum sja1105_reset_reason reason) { + const int mask = (BMCR_SPEED1000 | BMCR_SPEED100 | BMCR_SPEED10); struct ptp_system_timestamp ptp_sts_before; struct ptp_system_timestamp ptp_sts_after; struct sja1105_mac_config_entry *mac;
@@ -1684,14 +1685,16 @@ int sja1105_static_config_reload(struct sja1105_private *priv, sja1105_sgmii_pcs_config(priv, an_enabled, false); if (!an_enabled) { - int speed = SPEED_UNKNOWN; + int speed; - if (bmcr & BMCR_SPEED1000) + if ((bmcr & mask) == BMCR_SPEED1000) speed = SPEED_1000; - else if (bmcr & BMCR_SPEED100) + else if ((bmcr & mask) == BMCR_SPEED100) speed = SPEED_100; - else if (bmcr & BMCR_SPEED10) + else if ((bmcr & mask) == BMCR_SPEED10) speed = SPEED_10; + else + speed = SPEED_UNKNOWN; sja1105_sgmii_pcs_force_speed(priv, speed); }
--
2.25.1