Hello!
On 01.05.2020 16:43, Colin King wrote:
From: Colin Ian King <colin.king@xxxxxxxxxxxxx>
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@xxxxxxxxxxxxx>
---
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);
Why not declare it in the block it's used in? Also, () not needed here.
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;
Why not the following?
int mask = bmcr & (BMCR_SPEED1000 | BMCR_SPEED100 |
BMCR_SPEED10);
- 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);
}
MBR, Sergei
