Author: dumbbell
Date: Sat Nov 26 13:43:50 2011
New Revision: 227992
URL: http://svn.freebsd.org/changeset/base/227992
Log:
Prevent a division by zero with some broken batteries
This problem was seen on a laptop with a dead battery.
Modified:
head/sys/dev/acpica/acpi_battery.c
Modified: head/sys/dev/acpica/acpi_battery.c
==============================================================================
--- head/sys/dev/acpica/acpi_battery.c Sat Nov 26 08:23:25 2011
(r227991)
+++ head/sys/dev/acpica/acpi_battery.c Sat Nov 26 13:43:50 2011
(r227992)
@@ -205,6 +205,14 @@ acpi_battery_get_battinfo(device_t dev,
bif->lfcap = (bif->lfcap * bif->dvol) / 1000;
}
+ /*
+ * The calculation above may set bif->lfcap to zero. This was
+ * seen on a laptop with a broken battery. The result of the
+ * division was rounded to zero.
+ */
+ if (!acpi_battery_bif_valid(bif))
+ continue;
+
/* Calculate percent capacity remaining. */
bi[i].cap = (100 * bst[i].cap) / bif->lfcap;
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