[PATCH 5.12 270/384] power: supply: cpcap-battery: fix invalid usage of list cursor

[Greg Kroah-Hartman]

From: Guangqing Zhu <zhuguangqing83@xxxxxxxxx>

[ 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@xxxxxxxxx>
Reviewed-by: Tony Lindgren <tony@xxxxxxxxxxx>
Reviewed-by: Carl Philipp Klemm <philipp@xxxxxxxx>
Tested-by: Carl Philipp Klemm <philipp@xxxxxxxx>
Signed-off-by: Sebastian Reichel <sebastian.reichel@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/power/supply/cpcap-battery.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/power/supply/cpcap-battery.c b/drivers/power/supply/cpcap-battery.c
index 6d5bcdb9f45d..a3fc0084cda0 100644
--- a/drivers/power/supply/cpcap-battery.c
+++ b/drivers/power/supply/cpcap-battery.c
@@ -786,7 +786,7 @@ 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);
-- 
2.30.2