Commit 36844c85 authored by Vadim Pasternak's avatar Vadim Pasternak Committed by David S. Miller

mlxsw: core: Add validation of hardware device types for MGPIR register

When reading the number of gearboxes from the hardware, the driver does
not validate the returned 'device type' field. The driver can therefore
wrongly assume that the queried devices are gearboxes.

On Spectrum-3 systems that support different types of devices, this can
prevent the driver from loading, as it will try to query the
temperature sensors from devices which it assumes are gearboxes and in
fact are not.

For example:
[  218.129230] mlxsw_minimal 2-0048: Reg cmd access status failed (status=7(bad parameter))
[  218.138282] mlxsw_minimal 2-0048: Reg cmd access failed (reg_id=900a(mtmp),type=write)
[  218.147131] mlxsw_minimal 2-0048: Failed to setup temp sensor number 256
[  218.534480] mlxsw_minimal 2-0048: Fail to register core bus
[  218.540714] mlxsw_minimal: probe of 2-0048 failed with error -5

Fix this by validating the 'device type' field.

Fixes: 2e265a8b ("mlxsw: core: Extend hwmon interface with inter-connect temperature attributes")
Fixes: f14f4e62 ("mlxsw: core: Extend thermal core with per inter-connect device thermal zones")
Signed-off-by: default avatarVadim Pasternak <vadimp@mellanox.com>
Acked-by: default avatarJiri Pirko <jiri@mellanox.com>
Signed-off-by: default avatarIdo Schimmel <idosch@mellanox.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 490f0542
...@@ -573,6 +573,7 @@ static int mlxsw_hwmon_module_init(struct mlxsw_hwmon *mlxsw_hwmon) ...@@ -573,6 +573,7 @@ static int mlxsw_hwmon_module_init(struct mlxsw_hwmon *mlxsw_hwmon)
static int mlxsw_hwmon_gearbox_init(struct mlxsw_hwmon *mlxsw_hwmon) static int mlxsw_hwmon_gearbox_init(struct mlxsw_hwmon *mlxsw_hwmon)
{ {
enum mlxsw_reg_mgpir_device_type device_type;
int index, max_index, sensor_index; int index, max_index, sensor_index;
char mgpir_pl[MLXSW_REG_MGPIR_LEN]; char mgpir_pl[MLXSW_REG_MGPIR_LEN];
char mtmp_pl[MLXSW_REG_MTMP_LEN]; char mtmp_pl[MLXSW_REG_MTMP_LEN];
...@@ -584,8 +585,9 @@ static int mlxsw_hwmon_gearbox_init(struct mlxsw_hwmon *mlxsw_hwmon) ...@@ -584,8 +585,9 @@ static int mlxsw_hwmon_gearbox_init(struct mlxsw_hwmon *mlxsw_hwmon)
if (err) if (err)
return err; return err;
mlxsw_reg_mgpir_unpack(mgpir_pl, &gbox_num, NULL, NULL, NULL); mlxsw_reg_mgpir_unpack(mgpir_pl, &gbox_num, &device_type, NULL, NULL);
if (!gbox_num) if (device_type != MLXSW_REG_MGPIR_DEVICE_TYPE_GEARBOX_DIE ||
!gbox_num)
return 0; return 0;
index = mlxsw_hwmon->module_sensor_max; index = mlxsw_hwmon->module_sensor_max;
......
...@@ -895,8 +895,10 @@ static int ...@@ -895,8 +895,10 @@ static int
mlxsw_thermal_gearboxes_init(struct device *dev, struct mlxsw_core *core, mlxsw_thermal_gearboxes_init(struct device *dev, struct mlxsw_core *core,
struct mlxsw_thermal *thermal) struct mlxsw_thermal *thermal)
{ {
enum mlxsw_reg_mgpir_device_type device_type;
struct mlxsw_thermal_module *gearbox_tz; struct mlxsw_thermal_module *gearbox_tz;
char mgpir_pl[MLXSW_REG_MGPIR_LEN]; char mgpir_pl[MLXSW_REG_MGPIR_LEN];
u8 gbox_num;
int i; int i;
int err; int err;
...@@ -908,11 +910,13 @@ mlxsw_thermal_gearboxes_init(struct device *dev, struct mlxsw_core *core, ...@@ -908,11 +910,13 @@ mlxsw_thermal_gearboxes_init(struct device *dev, struct mlxsw_core *core,
if (err) if (err)
return err; return err;
mlxsw_reg_mgpir_unpack(mgpir_pl, &thermal->tz_gearbox_num, NULL, NULL, mlxsw_reg_mgpir_unpack(mgpir_pl, &gbox_num, &device_type, NULL,
NULL); NULL);
if (!thermal->tz_gearbox_num) if (device_type != MLXSW_REG_MGPIR_DEVICE_TYPE_GEARBOX_DIE ||
!gbox_num)
return 0; return 0;
thermal->tz_gearbox_num = gbox_num;
thermal->tz_gearbox_arr = kcalloc(thermal->tz_gearbox_num, thermal->tz_gearbox_arr = kcalloc(thermal->tz_gearbox_num,
sizeof(*thermal->tz_gearbox_arr), sizeof(*thermal->tz_gearbox_arr),
GFP_KERNEL); GFP_KERNEL);
......
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