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hwmon: (occ) fix unaligned accesses

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[ Upstream commit 2c021b45c154958566aad0cae9f74ab26a2d5732 ]

Passing a pointer to an unaligned integer as a function argument is
undefined behavior:

drivers/hwmon/occ/common.c:492:27: warning: taking address of packed member 'accumulator' of class or structure 'power_sensor_2' may result in an unaligned pointer value [-Waddress-of-packed-member]
  492 |   val = occ_get_powr_avg(&power->accumulator,
      |                           ^~~~~~~~~~~~~~~~~~
drivers/hwmon/occ/common.c:493:13: warning: taking address of packed member 'update_tag' of class or structure 'power_sensor_2' may result in an unaligned pointer value [-Waddress-of-packed-member]
  493 |            &power->update_tag);
      |             ^~~~~~~~~~~~~~~~~

Move the get_unaligned() calls out of the function and pass these
through argument registers instead.

Fixes: c10e753d43 ("hwmon (occ): Add sensor types and versions")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20250610092553.2641094-1-arnd@kernel.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Arnd Bergmann
2025-06-10 11:25:49 +02:00
committed by Greg Kroah-Hartman
parent 1312d9bf88
commit 4c8f5b0483
1 changed files with 13 additions and 15 deletions
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28
drivers/hwmon/occ/common.c
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@@ -459,12 +459,10 @@ static ssize_t occ_show_power_1(struct device *dev,
return sysfs_emit(buf, "%llu\n", val);
}
static u64 occ_get_powr_avg(u64 *accum, u32 *samples)
static u64 occ_get_powr_avg(u64 accum, u32 samples)
{
u64 divisor = get_unaligned_be32(samples);
return (divisor == 0) ? 0 :
div64_u64(get_unaligned_be64(accum) * 1000000ULL, divisor);
return (samples == 0) ? 0 :
mul_u64_u32_div(accum, 1000000UL, samples);
}
static ssize_t occ_show_power_2(struct device *dev,
@@ -489,8 +487,8 @@ static ssize_t occ_show_power_2(struct device *dev,
get_unaligned_be32(&power->sensor_id),
power->function_id, power->apss_channel);
case 1:
val = occ_get_powr_avg(&power->accumulator,
&power->update_tag);
val = occ_get_powr_avg(get_unaligned_be64(&power->accumulator),
get_unaligned_be32(&power->update_tag));
break;
case 2:
val = (u64)get_unaligned_be32(&power->update_tag) *
@@ -527,8 +525,8 @@ static ssize_t occ_show_power_a0(struct device *dev,
return sysfs_emit(buf, "%u_system\n",
get_unaligned_be32(&power->sensor_id));
case 1:
val = occ_get_powr_avg(&power->system.accumulator,
&power->system.update_tag);
val = occ_get_powr_avg(get_unaligned_be64(&power->system.accumulator),
get_unaligned_be32(&power->system.update_tag));
break;
case 2:
val = (u64)get_unaligned_be32(&power->system.update_tag) *
@@ -541,8 +539,8 @@ static ssize_t occ_show_power_a0(struct device *dev,
return sysfs_emit(buf, "%u_proc\n",
get_unaligned_be32(&power->sensor_id));
case 5:
val = occ_get_powr_avg(&power->proc.accumulator,
&power->proc.update_tag);
val = occ_get_powr_avg(get_unaligned_be64(&power->proc.accumulator),
get_unaligned_be32(&power->proc.update_tag));
break;
case 6:
val = (u64)get_unaligned_be32(&power->proc.update_tag) *
@@ -555,8 +553,8 @@ static ssize_t occ_show_power_a0(struct device *dev,
return sysfs_emit(buf, "%u_vdd\n",
get_unaligned_be32(&power->sensor_id));
case 9:
val = occ_get_powr_avg(&power->vdd.accumulator,
&power->vdd.update_tag);
val = occ_get_powr_avg(get_unaligned_be64(&power->vdd.accumulator),
get_unaligned_be32(&power->vdd.update_tag));
break;
case 10:
val = (u64)get_unaligned_be32(&power->vdd.update_tag) *
@@ -569,8 +567,8 @@ static ssize_t occ_show_power_a0(struct device *dev,
return sysfs_emit(buf, "%u_vdn\n",
get_unaligned_be32(&power->sensor_id));
case 13:
val = occ_get_powr_avg(&power->vdn.accumulator,
&power->vdn.update_tag);
val = occ_get_powr_avg(get_unaligned_be64(&power->vdn.accumulator),
get_unaligned_be32(&power->vdn.update_tag));
break;
case 14:
val = (u64)get_unaligned_be32(&power->vdn.update_tag) *