[PATCH 1/1] APM-EMULATION: apm_get_power_status() should be NULL on init [was: Advice on battery support]

From: Rodolfo Giometti
Date: Fri Feb 02 2007 - 16:27:52 EST


APM-EMULATION: apm_get_power_status() should be NULL on init.

Signed-off-by: Rodolfo Giometti <giometti@xxxxxxxxxxxx>

---

If the function apm_get_info() do like this:

static int apm_get_info(char *buf, char **start, off_t fpos, int length)
{
struct apm_power_info info;
char *units;
int ret;

info.ac_line_status = 0xff;
info.battery_status = 0xff;
info.battery_flag = 0xff;
info.battery_life = -1;
info.time = -1;
info.units = -1;

if (apm_get_power_status)
apm_get_power_status(&info);
...

we shouldn't set:

static void __apm_get_power_status(struct apm_power_info *info)
{
}

void (*apm_get_power_status)(struct apm_power_info *) = __apm_get_power_status;

otherwise the check is not needed. Furthermore setting the function to
NULL signals that the apm-emulation layer is not already assigned (I
found this very useful for my apm-emulation battery_class support).
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/