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wctdm24xxp: Eliminate chance for channel to be stuck in RED alarm.

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There was a code patch where it was possible to get stuck in RED ALARM on a
channel when debouncing the battery states. The state transitions would look
like this:

BATTERY_PRESENT -> BATTERY_DEBOUNCING_LOST -> BATTERY_DEBOUNCING_LOST_ALARM --
(send alarm up to asterisk) --> BATTERY_LOST -> BATTERY_DEBOUNCING_PRESENT ->
BATTERY_DEBOUNCING_PRESENT_ALARM -> BATTERY_DEBOUNCING_LOST -> BATTERY_PRESENT

In the above sequence there was never any transition from
BATTERY_DEBOUNCING_PRESENT_ALARM to BATTERY_PRESENT so the alarm to Asterisk was
never cleared and the channel stayed stuck.

Now when you loose battery when in the BATTERY_DEBOUNCING_PRESENT_ALARM go all
the way back to the BATTERY_LOST state instead of the BATTERY_DEBOUNCING_LOST
state so that all the events are properly sent up.

This fixes a regression introduced in 2.6.0 with commit (r10169 "wctdm24xxp: Use
interval for debouncing FXO battery." 874b76bd22).

Internal-Issue-ID: DAHDI-1019
Signed-off-by: Shaun Ruffell <sruffell@digium.com>
This commit is contained in:
Shaun Ruffell 2013-01-24 11:37:29 -06:00
parent a6be603590
commit 8bf0434896
1 changed files with 2 additions and 2 deletions
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4
drivers/dahdi/wctdm24xxp/base.c
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@ -1962,13 +1962,13 @@ wctdm_check_battery_lost(struct wctdm *wc, struct wctdm_module *const mod)
*/
switch (fxo->battery_state) {
case BATTERY_DEBOUNCING_PRESENT:
case BATTERY_DEBOUNCING_PRESENT_ALARM: /* intentional drop through */
/* we were going to BATTERY_PRESENT, but
* battery was lost again. */
fxo->battery_state = BATTERY_LOST;
break;
case BATTERY_UNKNOWN:
mod_hooksig(wc, mod, DAHDI_RXSIG_ONHOOK);
case BATTERY_DEBOUNCING_PRESENT_ALARM: /* intentional drop through */
case BATTERY_PRESENT:
fxo->battery_state = BATTERY_DEBOUNCING_LOST;
fxo->battdebounce_timer = wc->framecount + battdebounce;
@ -2062,6 +2062,7 @@ wctdm_check_battery_present(struct wctdm *wc, struct wctdm_module *const mod)
case BATTERY_PRESENT:
break;
case BATTERY_DEBOUNCING_LOST:
case BATTERY_DEBOUNCING_LOST_ALARM:
/* we were going to BATTERY_LOST, but battery appeared again,
* so clear the debounce timer */
fxo->battery_state = BATTERY_PRESENT;
@ -2069,7 +2070,6 @@ wctdm_check_battery_present(struct wctdm *wc, struct wctdm_module *const mod)
case BATTERY_UNKNOWN:
mod_hooksig(wc, mod, DAHDI_RXSIG_OFFHOOK);
case BATTERY_LOST: /* intentional drop through */
case BATTERY_DEBOUNCING_LOST_ALARM:
fxo->battery_state = BATTERY_DEBOUNCING_PRESENT;
fxo->battdebounce_timer = wc->framecount + battdebounce;
break;