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net: pse-pd: Add power limit check 

Checking only the current limit is not sufficient. According to the
standard, voltage can reach up to 57V and current up to 1.92A, which
exceeds the power limit described in the standard (99.9W). Add a power
limit check to prevent this.

Acked-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Kory Maincent 2025-01-10 10:40:22 +01:00 committed by Paolo Abeni
parent 675d0e3cac
commit 6e56a6d47a
2 changed files with 5 additions and 0 deletions
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3
drivers/net/pse-pd/pse_core.c
View File

@ -877,6 +877,9 @@ int pse_ethtool_set_pw_limit(struct pse_control *psec,
int uV, uA, ret;
s64 tmp_64;
if (pw_limit > MAX_PI_PW)
return -ERANGE;
ret = regulator_get_voltage(psec->ps);
if (!ret) {
NL_SET_ERR_MSG(extack,

2
include/linux/pse-pd/pse.h
View File

@ -11,6 +11,8 @@
/* Maximum current in uA according to IEEE 802.3-2022 Table 145-1 */
#define MAX_PI_CURRENT 1920000
/* Maximum power in mW according to IEEE 802.3-2022 Table 145-16 */
#define MAX_PI_PW 99900
struct phy_device;
struct pse_controller_dev;