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Message-ID: <bc405a6f782792dc41e01f9ddf9eadca3589fcdc.1753101969.git.hns@goldelico.com>
Date: Mon, 21 Jul 2025 14:46:09 +0200
From: "H. Nikolaus Schaller" <hns@...delico.com>
To: Sebastian Reichel <sre@...nel.org>,
Jerry Lv <Jerry.Lv@...s.com>
Cc: Pali Rohár <pali@...nel.org>,
linux-pm@...r.kernel.org,
linux-kernel@...r.kernel.org,
letux-kernel@...nphoenux.org,
stable@...r.kernel.org,
kernel@...a-handheld.com,
andreas@...nade.info,
"H. Nikolaus Schaller" <hns@...delico.com>
Subject: [PATCH] power: supply: bq27xxx: fix error return in case of no bq27000 hdq battery
Since commit
commit f16d9fb6cf03 ("power: supply: bq27xxx: Retrieve again when busy")
the console log of some devices with hdq but no bq27000 battery
(like the Pandaboard) is flooded with messages like:
[ 34.247833] power_supply bq27000-battery: driver failed to report 'status' property: -1
as soon as user-space is finding a /sys entry and trying to read the
"status" property.
It turns out that the offending commit changes the logic to now return the
value of cache.flags if it is <0. This is likely under the assumption that
it is an error number. In normal errors from bq27xxx_read() this is indeed
the case.
But there is special code to detect if no bq27000 is installed or accessible
through hdq/1wire and wants to report this. In that case, the cache.flags
are set (historically) to constant -1 which did make reading properties
return -ENODEV. So everything appeared to be fine before the return value was
fixed. Now the -1 is returned as -ENOPERM instead of -ENODEV, triggering the
error condition in power_supply_format_property() which then floods the
console log.
So we change the detection of missing bq27000 battery to simply set
cache.flags = -ENODEV
instead of -1.
Fixes: f16d9fb6cf03 ("power: supply: bq27xxx: Retrieve again when busy")
Cc: Jerry Lv <Jerry.Lv@...s.com>
Cc: stable@...r.kernel.org
Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
---
drivers/power/supply/bq27xxx_battery.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/power/supply/bq27xxx_battery.c b/drivers/power/supply/bq27xxx_battery.c
index 93dcebbe11417..efe02ad695a62 100644
--- a/drivers/power/supply/bq27xxx_battery.c
+++ b/drivers/power/supply/bq27xxx_battery.c
@@ -1920,7 +1920,7 @@ static void bq27xxx_battery_update_unlocked(struct bq27xxx_device_info *di)
cache.flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, has_singe_flag);
if ((cache.flags & 0xff) == 0xff)
- cache.flags = -1; /* read error */
+ cache.flags = -ENODEV; /* read error */
if (cache.flags >= 0) {
cache.capacity = bq27xxx_battery_read_soc(di);
--
2.50.0
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