On Wednesday, July 4, 2018 12:27:15 PM CEST Jouke Witteveen wrote:
> A hooking API was implemented for 4.17 in fa93854f7a7ed63d followed by
> hooks for Thinkpad laptops in 2801b9683f740012. The Thinkpad drivers
> did not support the Thinkpad 13 and the hooking API crashes on
> unsupported batteries by altering a list of hooks during unsafe
> iteration. Thus, Thinkpad 13 laptops could no longer boot.
>
> Additionally, a lock was kept in place and debugging information was
> printed out of order.
>
> Signed-off-by: Jouke Witteveen <j.witteveen@xxxxxxxxx>
> ---
>
> This time with a more informative commit message (no functional changes).
>
> drivers/acpi/battery.c | 9 +++++----
> 1 file changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
> index b0113a58..d79ad844 100644
> --- a/drivers/acpi/battery.c
> +++ b/drivers/acpi/battery.c
> @@ -717,10 +717,11 @@ void battery_hook_register(struct acpi_battery_hook *hook)
> */
> pr_err("extension failed to load: %s", hook->name);
> __battery_hook_unregister(hook, 0);
> - return;
> + goto end;
> }
> }
> pr_info("new extension: %s\n", hook->name);
> +end:
> mutex_unlock(&hook_mutex);
> }
> EXPORT_SYMBOL_GPL(battery_hook_register);
> @@ -732,7 +733,7 @@ EXPORT_SYMBOL_GPL(battery_hook_register);
> */
> static void battery_hook_add_battery(struct acpi_battery *battery)
> {
> - struct acpi_battery_hook *hook_node;
> + struct acpi_battery_hook *hook_node, *tmp;
>
> mutex_lock(&hook_mutex);
> INIT_LIST_HEAD(&battery->list);
> @@ -744,15 +745,15 @@ static void battery_hook_add_battery(struct acpi_battery *battery)
> * when a battery gets hotplugged or initialized
> * during the battery module initialization.
> */
> - list_for_each_entry(hook_node, &battery_hook_list, list) {
> + list_for_each_entry_safe(hook_node, tmp, &battery_hook_list, list) {
> if (hook_node->add_battery(battery->bat)) {
> /*
> * The notification of the extensions has failed, to
> * prevent further errors we will unload the extension.
> */
> - __battery_hook_unregister(hook_node, 0);
> pr_err("error in extension, unloading: %s",
> hook_node->name);
> + __battery_hook_unregister(hook_node, 0);
> }
> }
> mutex_unlock(&hook_mutex);
>
Applied and pushed for 4.18-rc4.
Thanks!
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