From: Colin King <colin.king@canonical.com>
To: Vladimir Oltean <olteanv@gmail.com>, Andrew Lunn <andrew@lunn.ch>,
Vivien Didelot <vivien.didelot@gmail.com>,
Florian Fainelli <f.fainelli@gmail.com>,
"David S . Miller" <davem@davemloft.net>,
Russell King <rmk+kernel@armlinux.org.uk>,
linux-kernel@vger.kernel.org
Cc: kernel-janitors@vger.kernel.org, netdev@vger.kernel.org
Subject: [PATCH] net: dsa: sja1105: fix speed setting for 10 MBPS
Date: Fri, 1 May 2020 14:43:10 +0100 [thread overview]
Message-ID: <20200501134310.289561-1-colin.king@canonical.com> (raw)
From: Colin Ian King <colin.king@canonical.com>
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 <colin.king@canonical.com>
---
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
next reply other threads:[~2020-05-01 13:47 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-01 13:43 Colin King [this message]
2020-05-01 18:00 ` AW: [PATCH] net: dsa: sja1105: fix speed setting for 10 MBPS Walter Harms
2020-05-01 18:37 ` Russell King - ARM Linux admin
2020-05-02 12:21 ` Sergei Shtylyov
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