Re: regression from 2.6.23-rc2 to -rc3 BAT missing

From: Alexey Starikovskiy
Date: Mon Aug 13 2007 - 09:49:08 EST

Please check if the attached patch helps.

Thanks,
Alex.

Norbert Preining wrote:
> On Mon, 13 Aug 2007, Alexey Starikovskiy wrote:
>> Do you know if you have SBS or CM battery?
>> What driver do you use: sbs.ko or battery.ko?
>
> I am quite sure that it is a CM battery, not a SBS:
>
> CONFIG_ACPI_BATTERY=y
>
> did normal work, and CONFIG_ACPI_SBS=m but module not loaded. Same
> setting as always.
>
> I also loaded sbs.ko without any change.
>
> Best wishes
>
> Norbert
>
> -------------------------------------------------------------------------------
> Dr. Norbert Preining <preining@xxxxxxxx> Vienna University of Technology
> Debian Developer <preining@xxxxxxxxxx> Debian TeX Group
> gpg DSA: 0x09C5B094 fp: 14DF 2E6C 0307 BE6D AD76 A9C0 D2BF 4AA3 09C5 B094
> -------------------------------------------------------------------------------
> SCREMBY (n.)
> The dehydrated felt-tip pen attached by a string to the 'Don't Forget'
> board in the kitchen which has never worked in living memory but which
> no one can be bothered to throw away.
> --- Douglas Adams, The Meaning of Liff
>

ACPI: Battery: don't use acpi_extract_package()

From: Alexey Starikovskiy <astarikivskiy@xxxxxxx>

acpi_extract_package() creates more problems with memory management than
solves as helper for package handling.

Signed-off-by: Alexey Starikovskiy <astarikovskiy@xxxxxxx>
---

drivers/acpi/battery.c | 309 +++++++++++++++++++-----------------------------
1 files changed, 123 insertions(+), 186 deletions(-)

diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
index d7b499f..14bdfad 100644
--- a/drivers/acpi/battery.c
+++ b/drivers/acpi/battery.c
@@ -36,9 +36,6 @@

#define ACPI_BATTERY_VALUE_UNKNOWN 0xFFFFFFFF

-#define ACPI_BATTERY_FORMAT_BIF "NNNNNNNNNSSSS"
-#define ACPI_BATTERY_FORMAT_BST "NNNN"
-
#define ACPI_BATTERY_COMPONENT 0x00040000
#define ACPI_BATTERY_CLASS "battery"
#define ACPI_BATTERY_DEVICE_NAME "Battery"
@@ -90,29 +87,6 @@ static struct acpi_driver acpi_battery_driver = {
},
};

-struct acpi_battery_state {
- acpi_integer state;
- acpi_integer present_rate;
- acpi_integer remaining_capacity;
- acpi_integer present_voltage;
-};
-
-struct acpi_battery_info {
- acpi_integer power_unit;
- acpi_integer design_capacity;
- acpi_integer last_full_capacity;
- acpi_integer battery_technology;
- acpi_integer design_voltage;
- acpi_integer design_capacity_warning;
- acpi_integer design_capacity_low;
- acpi_integer battery_capacity_granularity_1;
- acpi_integer battery_capacity_granularity_2;
- acpi_string model_number;
- acpi_string serial_number;
- acpi_string battery_type;
- acpi_string oem_info;
-};
-
enum acpi_battery_files {
ACPI_BATTERY_INFO = 0,
ACPI_BATTERY_STATE,
@@ -120,32 +94,42 @@ enum acpi_battery_files {
ACPI_BATTERY_NUMFILES,
};

-struct acpi_battery_flags {
- u8 battery_present_prev;
- u8 alarm_present;
- u8 init_update;
- u8 update[ACPI_BATTERY_NUMFILES];
- u8 power_unit;
-};
-
struct acpi_battery {
struct acpi_device *device;
- struct acpi_battery_flags flags;
- struct acpi_buffer bif_data;
- struct acpi_buffer bst_data;
struct mutex lock;
unsigned long alarm;
unsigned long update_time[ACPI_BATTERY_NUMFILES];
-
+ int state;
+ int present_rate;
+ int remaining_capacity;
+ int present_voltage;
+ int power_unit;
+ int design_capacity;
+ int last_full_capacity;
+ int technology;
+ int design_voltage;
+ int design_capacity_warning;
+ int design_capacity_low;
+ int capacity_granularity_1;
+ int capacity_granularity_2;
+ char model_number[32];
+ char serial_number[32];
+ char type[32];
+ char oem_info[32];
+ u8 present_prev;
+ u8 alarm_present;
+ u8 init_update;
+ u8 update[ACPI_BATTERY_NUMFILES];
};

inline int acpi_battery_present(struct acpi_battery *battery)
{
return battery->device->status.battery_present;
}
+
inline char *acpi_battery_power_units(struct acpi_battery *battery)
{
- if (battery->flags.power_unit)
+ if (battery->power_unit)
return ACPI_BATTERY_UNITS_AMPS;
else
return ACPI_BATTERY_UNITS_WATTS;
@@ -166,43 +150,63 @@ static void acpi_battery_check_result(struct acpi_battery *battery, int result)
return;

if (result) {
- battery->flags.init_update = 1;
+ battery->init_update = 1;
}
}

-static int acpi_battery_extract_package(struct acpi_battery *battery,
- union acpi_object *package,
- struct acpi_buffer *format,
- struct acpi_buffer *data,
- char *package_name)
-{
- acpi_status status = AE_OK;
- struct acpi_buffer data_null = { 0, NULL };
+struct acpi_offsets {
+ size_t offset; /* offset inside struct acpi_sbs_battery */
+ u8 mode; /* int or string? */
+};

- status = acpi_extract_package(package, format, &data_null);
- if (status != AE_BUFFER_OVERFLOW) {
- ACPI_EXCEPTION((AE_INFO, status, "Extracting size %s",
- package_name));
- return -ENODEV;
- }
+static struct acpi_offsets state_offsets[] = {
+ {offsetof(struct acpi_battery, state), 0},
+ {offsetof(struct acpi_battery, present_rate), 0},
+ {offsetof(struct acpi_battery, remaining_capacity), 0},
+ {offsetof(struct acpi_battery, present_voltage), 0},
+};

- if (data_null.length != data->length) {
- kfree(data->pointer);
- data->pointer = kzalloc(data_null.length, GFP_KERNEL);
- if (!data->pointer) {
- ACPI_EXCEPTION((AE_INFO, AE_NO_MEMORY, "kzalloc()"));
- return -ENOMEM;
- }
- data->length = data_null.length;
- }
+static struct acpi_offsets info_offsets[] = {
+ {offsetof(struct acpi_battery, power_unit), 0},
+ {offsetof(struct acpi_battery, design_capacity), 0},
+ {offsetof(struct acpi_battery, last_full_capacity), 0},
+ {offsetof(struct acpi_battery, technology), 0},
+ {offsetof(struct acpi_battery, design_voltage), 0},
+ {offsetof(struct acpi_battery, design_capacity_warning), 0},
+ {offsetof(struct acpi_battery, design_capacity_low), 0},
+ {offsetof(struct acpi_battery, capacity_granularity_1), 0},
+ {offsetof(struct acpi_battery, capacity_granularity_2), 0},
+ {offsetof(struct acpi_battery, model_number), 1},
+ {offsetof(struct acpi_battery, serial_number), 1},
+ {offsetof(struct acpi_battery, type), 1},
+ {offsetof(struct acpi_battery, oem_info), 1},
+};

- status = acpi_extract_package(package, format, data);
- if (ACPI_FAILURE(status)) {
- ACPI_EXCEPTION((AE_INFO, status, "Extracting %s",
- package_name));
- return -ENODEV;
+static int extract_package(struct acpi_battery *battery,
+ union acpi_object *package,
+ struct acpi_offsets *offsets, int num)
+{
+ int i, *x;
+ union acpi_object *element;
+ if (package->type != ACPI_TYPE_PACKAGE)
+ return -EFAULT;
+ for (i = 0; i < num; ++i) {
+ if (package->package.count <= i)
+ return -EFAULT;
+ element = &package->package.elements[i];
+ if (offsets[i].mode) {
+ if (element->type != ACPI_TYPE_STRING &&
+ element->type != ACPI_TYPE_BUFFER)
+ return -EFAULT;
+ strncpy((u8 *)battery + offsets[i].offset,
+ element->string.pointer, 32);
+ } else {
+ if (element->type != ACPI_TYPE_INTEGER)
+ return -EFAULT;
+ x = (int *)((u8 *)battery + offsets[i].offset);
+ *x = element->integer.value;
+ }
}
-
return 0;
}

@@ -223,19 +227,10 @@ static int acpi_battery_get_info(struct acpi_battery *battery)
int result = 0;
acpi_status status = 0;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
- struct acpi_buffer format = { sizeof(ACPI_BATTERY_FORMAT_BIF),
- ACPI_BATTERY_FORMAT_BIF
- };
- union acpi_object *package = NULL;
- struct acpi_buffer *data = NULL;
- struct acpi_battery_info *bif = NULL;

battery->update_time[ACPI_BATTERY_INFO] = get_seconds();
-
if (!acpi_battery_present(battery))
return 0;
-
- /* Evaluate _BIF */
mutex_lock(&battery->lock);
status = acpi_evaluate_object(acpi_battery_handle(battery), "_BIF",
NULL, &buffer);
@@ -244,28 +239,9 @@ static int acpi_battery_get_info(struct acpi_battery *battery)
ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BIF"));
return -ENODEV;
}
-
- package = buffer.pointer;
-
- data = &battery->bif_data;
-
- /* Extract Package Data */
-
- result =
- acpi_battery_extract_package(battery, package, &format, data,
- "_BIF");
- if (result)
- goto end;
-
- end:
-
+ result = extract_package(battery, buffer.pointer,
+ info_offsets, ARRAY_SIZE(info_offsets));
kfree(buffer.pointer);
-
- if (!result) {
- bif = data->pointer;
- battery->flags.power_unit = bif->power_unit;
- }
-
return result;
}

@@ -274,11 +250,6 @@ static int acpi_battery_get_state(struct acpi_battery *battery)
int result = 0;
acpi_status status = 0;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
- struct acpi_buffer format = { sizeof(ACPI_BATTERY_FORMAT_BST),
- ACPI_BATTERY_FORMAT_BST
- };
- union acpi_object *package = NULL;
- struct acpi_buffer *data = NULL;

battery->update_time[ACPI_BATTERY_STATE] = get_seconds();

@@ -294,22 +265,9 @@ static int acpi_battery_get_state(struct acpi_battery *battery)
ACPI_EXCEPTION((AE_INFO, status, "Evaluating _BST"));
return -ENODEV;
}
-
- package = buffer.pointer;
-
- data = &battery->bst_data;
-
- /* Extract Package Data */
-
- result =
- acpi_battery_extract_package(battery, package, &format, data,
- "_BST");
- if (result)
- goto end;
-
- end:
+ result = extract_package(battery, buffer.pointer,
+ state_offsets, ARRAY_SIZE(state_offsets));
kfree(buffer.pointer);
-
return result;
}

@@ -332,7 +290,7 @@ static int acpi_battery_set_alarm(struct acpi_battery *battery,
if (!acpi_battery_present(battery))
return -ENODEV;

- if (!battery->flags.alarm_present)
+ if (!battery->alarm_present)
return -ENODEV;

arg0.integer.value = alarm;
@@ -356,22 +314,21 @@ static int acpi_battery_init_alarm(struct acpi_battery *battery)
int result = 0;
acpi_status status = AE_OK;
acpi_handle handle = NULL;
- struct acpi_battery_info *bif = battery->bif_data.pointer;
unsigned long alarm = battery->alarm;

/* See if alarms are supported, and if so, set default */

status = acpi_get_handle(acpi_battery_handle(battery), "_BTP", &handle);
if (ACPI_SUCCESS(status)) {
- battery->flags.alarm_present = 1;
- if (!alarm && bif) {
- alarm = bif->design_capacity_warning;
+ battery->alarm_present = 1;
+ if (!alarm) {
+ alarm = battery->design_capacity_warning;
}
result = acpi_battery_set_alarm(battery, alarm);
if (result)
goto end;
} else {
- battery->flags.alarm_present = 0;
+ battery->alarm_present = 0;
}

end:
@@ -387,7 +344,7 @@ static int acpi_battery_init_update(struct acpi_battery *battery)
if (result)
return result;

- battery->flags.battery_present_prev = acpi_battery_present(battery);
+ battery->present_prev = acpi_battery_present(battery);

if (acpi_battery_present(battery)) {
result = acpi_battery_get_info(battery);
@@ -413,7 +370,7 @@ static int acpi_battery_update(struct acpi_battery *battery,
update = 1;
}

- if (battery->flags.init_update) {
+ if (battery->init_update) {
result = acpi_battery_init_update(battery);
if (result)
goto end;
@@ -422,8 +379,8 @@ static int acpi_battery_update(struct acpi_battery *battery,
result = acpi_battery_get_status(battery);
if (result)
goto end;
- if ((!battery->flags.battery_present_prev & acpi_battery_present(battery))
- || (battery->flags.battery_present_prev & !acpi_battery_present(battery))) {
+ if ((!battery->present_prev & acpi_battery_present(battery))
+ || (battery->present_prev & !acpi_battery_present(battery))) {
result = acpi_battery_init_update(battery);
if (result)
goto end;
@@ -435,7 +392,7 @@ static int acpi_battery_update(struct acpi_battery *battery,

end:

- battery->flags.init_update = (result != 0);
+ battery->init_update = (result != 0);

*update_result_ptr = update_result;

@@ -446,19 +403,19 @@ static void acpi_battery_notify_update(struct acpi_battery *battery)
{
acpi_battery_get_status(battery);

- if (battery->flags.init_update) {
+ if (battery->init_update) {
return;
}

- if ((!battery->flags.battery_present_prev &
+ if ((!battery->present_prev &
acpi_battery_present(battery)) ||
- (battery->flags.battery_present_prev &
+ (battery->present_prev &
!acpi_battery_present(battery))) {
- battery->flags.init_update = 1;
+ battery->init_update = 1;
} else {
- battery->flags.update[ACPI_BATTERY_INFO] = 1;
- battery->flags.update[ACPI_BATTERY_STATE] = 1;
- battery->flags.update[ACPI_BATTERY_ALARM] = 1;
+ battery->update[ACPI_BATTERY_INFO] = 1;
+ battery->update[ACPI_BATTERY_STATE] = 1;
+ battery->update[ACPI_BATTERY_ALARM] = 1;
}
}

@@ -471,7 +428,6 @@ static struct proc_dir_entry *acpi_battery_dir;
static int acpi_battery_print_info(struct seq_file *seq, int result)
{
struct acpi_battery *battery = seq->private;
- struct acpi_battery_info *bif = NULL;
char *units = "?";

if (result)
@@ -484,30 +440,23 @@ static int acpi_battery_print_info(struct seq_file *seq, int result)
goto end;
}

- bif = battery->bif_data.pointer;
- if (!bif) {
- ACPI_EXCEPTION((AE_INFO, AE_ERROR, "BIF buffer is NULL"));
- result = -ENODEV;
- goto end;
- }
-
/* Battery Units */

units = acpi_battery_power_units(battery);

- if (bif->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
+ if (battery->design_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
seq_printf(seq, "design capacity: unknown\n");
else
seq_printf(seq, "design capacity: %d %sh\n",
- (u32) bif->design_capacity, units);
+ (u32) battery->design_capacity, units);

- if (bif->last_full_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
+ if (battery->last_full_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
seq_printf(seq, "last full capacity: unknown\n");
else
seq_printf(seq, "last full capacity: %d %sh\n",
- (u32) bif->last_full_capacity, units);
+ (u32) battery->last_full_capacity, units);

- switch ((u32) bif->battery_technology) {
+ switch ((u32) battery->technology) {
case 0:
seq_printf(seq, "battery technology: non-rechargeable\n");
break;
@@ -519,23 +468,23 @@ static int acpi_battery_print_info(struct seq_file *seq, int result)
break;
}

- if (bif->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
+ if (battery->design_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
seq_printf(seq, "design voltage: unknown\n");
else
seq_printf(seq, "design voltage: %d mV\n",
- (u32) bif->design_voltage);
+ (u32) battery->design_voltage);
seq_printf(seq, "design capacity warning: %d %sh\n",
- (u32) bif->design_capacity_warning, units);
+ (u32) battery->design_capacity_warning, units);
seq_printf(seq, "design capacity low: %d %sh\n",
- (u32) bif->design_capacity_low, units);
+ (u32) battery->design_capacity_low, units);
seq_printf(seq, "capacity granularity 1: %d %sh\n",
- (u32) bif->battery_capacity_granularity_1, units);
+ (u32) battery->capacity_granularity_1, units);
seq_printf(seq, "capacity granularity 2: %d %sh\n",
- (u32) bif->battery_capacity_granularity_2, units);
- seq_printf(seq, "model number: %s\n", bif->model_number);
- seq_printf(seq, "serial number: %s\n", bif->serial_number);
- seq_printf(seq, "battery type: %s\n", bif->battery_type);
- seq_printf(seq, "OEM info: %s\n", bif->oem_info);
+ (u32) battery->capacity_granularity_2, units);
+ seq_printf(seq, "model number: %s\n", battery->model_number);
+ seq_printf(seq, "serial number: %s\n", battery->serial_number);
+ seq_printf(seq, "battery type: %s\n", battery->type);
+ seq_printf(seq, "OEM info: %s\n", battery->oem_info);

end:

@@ -548,7 +497,6 @@ static int acpi_battery_print_info(struct seq_file *seq, int result)
static int acpi_battery_print_state(struct seq_file *seq, int result)
{
struct acpi_battery *battery = seq->private;
- struct acpi_battery_state *bst = NULL;
char *units = "?";

if (result)
@@ -561,50 +509,43 @@ static int acpi_battery_print_state(struct seq_file *seq, int result)
goto end;
}

- bst = battery->bst_data.pointer;
- if (!bst) {
- ACPI_EXCEPTION((AE_INFO, AE_ERROR, "BST buffer is NULL"));
- result = -ENODEV;
- goto end;
- }
-
/* Battery Units */

units = acpi_battery_power_units(battery);

- if (!(bst->state & 0x04))
+ if (!(battery->state & 0x04))
seq_printf(seq, "capacity state: ok\n");
else
seq_printf(seq, "capacity state: critical\n");

- if ((bst->state & 0x01) && (bst->state & 0x02)) {
+ if ((battery->state & 0x01) && (battery->state & 0x02)) {
seq_printf(seq,
"charging state: charging/discharging\n");
- } else if (bst->state & 0x01)
+ } else if (battery->state & 0x01)
seq_printf(seq, "charging state: discharging\n");
- else if (bst->state & 0x02)
+ else if (battery->state & 0x02)
seq_printf(seq, "charging state: charging\n");
else {
seq_printf(seq, "charging state: charged\n");
}

- if (bst->present_rate == ACPI_BATTERY_VALUE_UNKNOWN)
+ if (battery->present_rate == ACPI_BATTERY_VALUE_UNKNOWN)
seq_printf(seq, "present rate: unknown\n");
else
seq_printf(seq, "present rate: %d %s\n",
- (u32) bst->present_rate, units);
+ (u32) battery->present_rate, units);

- if (bst->remaining_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
+ if (battery->remaining_capacity == ACPI_BATTERY_VALUE_UNKNOWN)
seq_printf(seq, "remaining capacity: unknown\n");
else
seq_printf(seq, "remaining capacity: %d %sh\n",
- (u32) bst->remaining_capacity, units);
+ (u32) battery->remaining_capacity, units);

- if (bst->present_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
+ if (battery->present_voltage == ACPI_BATTERY_VALUE_UNKNOWN)
seq_printf(seq, "present voltage: unknown\n");
else
seq_printf(seq, "present voltage: %d mV\n",
- (u32) bst->present_voltage);
+ (u32) battery->present_voltage);

end:

@@ -713,7 +654,7 @@ static int acpi_battery_read(int fid, struct seq_file *seq)
int update = 0;

update = (get_seconds() - battery->update_time[fid] >= update_time);
- update = (update | battery->flags.update[fid]);
+ update = (update | battery->update[fid]);

result = acpi_battery_update(battery, update, &update_result);
if (result)
@@ -728,7 +669,7 @@ static int acpi_battery_read(int fid, struct seq_file *seq)
end:
result = acpi_read_funcs[fid].print(seq, result);
acpi_battery_check_result(battery, result);
- battery->flags.update[fid] = result;
+ battery->update[fid] = result;
return result;
}

@@ -902,7 +843,7 @@ static int acpi_battery_add(struct acpi_device *device)
if (result)
goto end;

- battery->flags.init_update = 1;
+ battery->init_update = 1;

result = acpi_battery_add_fs(device);
if (result)
@@ -948,10 +889,6 @@ static int acpi_battery_remove(struct acpi_device *device, int type)

acpi_battery_remove_fs(device);

- kfree(battery->bif_data.pointer);
-
- kfree(battery->bst_data.pointer);
-
mutex_destroy(&battery->lock);

kfree(battery);
@@ -969,7 +906,7 @@ static int acpi_battery_resume(struct acpi_device *device)

battery = device->driver_data;

- battery->flags.init_update = 1;
+ battery->init_update = 1;

return 0;
}