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thermal/drivers/mediatek/lvts_thermal: Fix wrong lvts_ctrl index

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In 'lvts_should_update_thresh()' and 'lvts_ctrl_start()' functions,
the parameter passed to 'lvts_for_each_valid_sensor()' macro is always
'lvts_ctrl->lvts_data->lvts_ctrl'. In other words, the array index 0
is systematically passed as 'struct lvts_ctrl_data' type item, even
when another item should be consumed instead.

Hence, the 'valid_sensor_mask' value which is selected can be wrong
because unrelated to the 'struct lvts_ctrl_data' type item that should
be used. Hence, some thermal zone can be registered for a sensor 'i'
that does not actually exist. Because of the invalid address used
as 'lvts_sensor[i].msr', this situation ends up with a crash in
'lvts_get_temp()' function, where this 'msr' pointer is passed to
'readl_poll_timeout()' function. The following message is output:
"Unable to handle kernel NULL pointer dereference at virtual
address <msr>", with <msr> = 0.

This patch fixes the issue.

Fixes: 11e6f4c314 ("thermal/drivers/mediatek/lvts_thermal: Allow early empty sensor slots")
Signed-off-by: Julien Panis <jpanis@baylibre.com>
Reviewed-by: Nicolas Pitre <npitre@baylibre.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20240503-mtk-thermal-lvts-ctrl-idx-fix-v1-2-f605c50ca117@baylibre.com
This commit is contained in:
Julien Panis 2024-05-03 17:35:14 +02:00 committed by Daniel Lezcano
parent e2d2266a2a
commit b66c079aab
1 changed files with 7 additions and 4 deletions
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11
drivers/thermal/mediatek/lvts_thermal.c
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@ -116,9 +116,9 @@ struct lvts_ctrl_data {
((s2) ? BIT(2) : 0) | \
((s3) ? BIT(3) : 0))
#define lvts_for_each_valid_sensor(i, lvts_ctrl_data) \
#define lvts_for_each_valid_sensor(i, lvts_ctrl) \
for ((i) = 0; (i) < LVTS_SENSOR_MAX; (i)++) \
if (!((lvts_ctrl_data)->valid_sensor_mask & BIT(i))) \
if (!((lvts_ctrl)->valid_sensor_mask & BIT(i))) \
continue; \
else
@ -145,6 +145,7 @@ struct lvts_ctrl {
const struct lvts_data *lvts_data;
u32 calibration[LVTS_SENSOR_MAX];
u32 hw_tshut_raw_temp;
u8 valid_sensor_mask;
int mode;
void __iomem *base;
int low_thresh;
@ -356,7 +357,7 @@ static bool lvts_should_update_thresh(struct lvts_ctrl *lvts_ctrl, int high)
if (high > lvts_ctrl->high_thresh)
return true;
lvts_for_each_valid_sensor(i, lvts_ctrl->lvts_data->lvts_ctrl)
lvts_for_each_valid_sensor(i, lvts_ctrl)
if (lvts_ctrl->sensors[i].high_thresh == lvts_ctrl->high_thresh
&& lvts_ctrl->sensors[i].low_thresh == lvts_ctrl->low_thresh)
return false;
@ -617,6 +618,8 @@ static int lvts_sensor_init(struct device *dev, struct lvts_ctrl *lvts_ctrl,
lvts_sensor[i].high_thresh = INT_MIN;
};
lvts_ctrl->valid_sensor_mask = lvts_ctrl_data->valid_sensor_mask;
return 0;
}
@ -1112,7 +1115,7 @@ static int lvts_ctrl_start(struct device *dev, struct lvts_ctrl *lvts_ctrl)
u32 *sensor_bitmap = lvts_ctrl->mode == LVTS_MSR_IMMEDIATE_MODE ?
sensor_imm_bitmap : sensor_filt_bitmap;
lvts_for_each_valid_sensor(i, lvts_ctrl->lvts_data->lvts_ctrl) {
lvts_for_each_valid_sensor(i, lvts_ctrl) {
int dt_id = lvts_sensors[i].dt_id;