In tpacpi_battery_init(), the return value of tpacpi_check_quirks() needs
to be checked. The battery should not be hooked if there is no matched
battery information in quirk table.

Add an error check and return -ENODEV immediately if the device fail
the check.

Fixes: 1a32ebb26ba9 ("platform/x86: thinkpad_acpi: Support battery quirk")
Cc: stable@vger.kernel.org
Signed-off-by: Wentao Liang <vulab@iscas.ac.cn>
---
v2: Fix double assignment error.

 drivers/platform/x86/thinkpad_acpi.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index 2cfb2ac3f465..93eaca3bd9d1 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -9973,7 +9973,9 @@ static int __init tpacpi_battery_init(struct ibm_init_struct *ibm)
 
 	tp_features.battery_force_primary = tpacpi_check_quirks(
 					battery_quirk_table,
-					ARRAY_SIZE(battery_quirk_table));
+					ARRAY_SIZE(battery_quirk_table))
+	if (!tp_features.battery_force_primary)
+		return -ENODEV;
 
 	battery_hook_register(&battery_hook);
 	return 0;
-- 
2.42.0.windows.2

On Mon, 7 Apr 2025, Wentao Liang wrote:

> In tpacpi_battery_init(), the return value of tpacpi_check_quirks() needs
> to be checked. The battery should not be hooked if there is no matched
> battery information in quirk table.
> 
> Add an error check and return -ENODEV immediately if the device fail
> the check.
> 
> Fixes: 1a32ebb26ba9 ("platform/x86: thinkpad_acpi: Support battery quirk")
> Cc: stable@vger.kernel.org
> Signed-off-by: Wentao Liang <vulab@iscas.ac.cn>
> ---
> v2: Fix double assignment error.
> 
>  drivers/platform/x86/thinkpad_acpi.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
> index 2cfb2ac3f465..93eaca3bd9d1 100644
> --- a/drivers/platform/x86/thinkpad_acpi.c
> +++ b/drivers/platform/x86/thinkpad_acpi.c
> @@ -9973,7 +9973,9 @@ static int __init tpacpi_battery_init(struct ibm_init_struct *ibm)
>  
>  	tp_features.battery_force_primary = tpacpi_check_quirks(
>  					battery_quirk_table,
> -					ARRAY_SIZE(battery_quirk_table));
> +					ARRAY_SIZE(battery_quirk_table))

Fine, using the same variable is okay but this will fail build as remove 
that semicolon.

> +	if (!tp_features.battery_force_primary)
> +		return -ENODEV;
>  
>  	battery_hook_register(&battery_hook);
>  	return 0;
> 

-- 
 i.