power: supply: cpcap-battery: fix invalid usage of list cursor

[ Upstream commit d0a43c12ee9f57ddb284272187bd18726c2c2c98 ]

Fix invalid usage of a list_for_each_entry in cpcap_battery_irq_thread().
Empty list or fully traversed list points to list head, which is not
NULL (and before the first element containing real data).

Signed-off-by: Guangqing Zhu <zhuguangqing83@gmail.com>
Reviewed-by: Tony Lindgren <tony@atomide.com>
Reviewed-by: Carl Philipp Klemm <philipp@uvos.xyz>
Tested-by: Carl Philipp Klemm <philipp@uvos.xyz>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/power/supply/cpcap-battery.c b/drivers/power/supply/cpcap-battery.c
index cebc5c8..793d4ca 100644 (file)
--- a/drivers/power/supply/cpcap-battery.c
+++ b/drivers/power/supply/cpcap-battery.c
@@ -626,7 +626,7 @@ static irqreturn_t cpcap_battery_irq_thread(int irq, void *data)
                        break;
        }
 
-       if (!d)
+       if (list_entry_is_head(d, &ddata->irq_list, node))
                return IRQ_NONE;
 
        latest = cpcap_battery_latest(ddata);