platform/mellanox: mlxreg-lc: Fix logic error in power state check

Fixes a logic issue in mlxreg_lc_completion_notify() where the
intention was to check if MLXREG_LC_POWERED flag is not set before
powering on the device.

The original code used "state & ~MLXREG_LC_POWERED" to check for the
absence of the POWERED bit. However this condition evaluates to true
even when other bits are set, leading to potentially incorrect
behavior.

Corrected the logic to explicitly check for the absence of
MLXREG_LC_POWERED using !(state & MLXREG_LC_POWERED).

Fixes: 62f9529b8d5c ("platform/mellanox: mlxreg-lc: Add initial support for Nvidia line card devices")
Suggested-by: Vadim Pasternak <vadimp@nvidia.com>
Signed-off-by: Alok Tiwari <alok.a.tiwari@oracle.com>
Link: https://lore.kernel.org/r/20250630105812.601014-1-alok.a.tiwari@oracle.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

diff --git a/drivers/platform/mellanox/mlxreg-lc.c b/drivers/platform/mellanox/mlxreg-lc.c
index 8eef3d990d1ae2bce3d2d3051b036766f82b2e7f..d1518598dfed5c0a802e838aff5ea590136dbd01 100644 (file)
--- a/drivers/platform/mellanox/mlxreg-lc.c
+++ b/drivers/platform/mellanox/mlxreg-lc.c
@@ -688,7 +688,7 @@ static int mlxreg_lc_completion_notify(void *handle, struct i2c_adapter *parent,
        if (regval & mlxreg_lc->data->mask) {
                mlxreg_lc->state |= MLXREG_LC_SYNCED;
                mlxreg_lc_state_update_locked(mlxreg_lc, MLXREG_LC_SYNCED, 1);
-               if (mlxreg_lc->state & ~MLXREG_LC_POWERED) {
+               if (!(mlxreg_lc->state & MLXREG_LC_POWERED)) {
                        err = mlxreg_lc_power_on_off(mlxreg_lc, 1);
                        if (err)
                                goto mlxreg_lc_regmap_power_on_off_fail;