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SubjectRe: [PATCH 09/13] firmware_loader: simplify sysctl declaration with register_sysctl_subdir()
On Fri, May 29, 2020 at 07:41:04AM +0000, Luis Chamberlain wrote:
> From: Xiaoming Ni <nixiaoming@huawei.com>
>
> Move the firmware config sysctl table to fallback_table.c and use the
> new register_sysctl_subdir() helper. This removes the clutter from
> kernel/sysctl.c.
>
> Signed-off-by: Xiaoming Ni <nixiaoming@huawei.com>
> Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
> ---
> drivers/base/firmware_loader/fallback.c | 4 ++++
> drivers/base/firmware_loader/fallback.h | 11 ++++++++++
> drivers/base/firmware_loader/fallback_table.c | 22 +++++++++++++++++--
> include/linux/sysctl.h | 1 -
> kernel/sysctl.c | 7 ------
> 5 files changed, 35 insertions(+), 10 deletions(-)

So it now takes more lines than the old stuff? :(

>
> diff --git a/drivers/base/firmware_loader/fallback.c b/drivers/base/firmware_loader/fallback.c
> index d9ac7296205e..8190653ae9a3 100644
> --- a/drivers/base/firmware_loader/fallback.c
> +++ b/drivers/base/firmware_loader/fallback.c
> @@ -200,12 +200,16 @@ static struct class firmware_class = {
>
> int register_sysfs_loader(void)
> {
> + int ret = register_firmware_config_sysctl();
> + if (ret != 0)
> + return ret;

checkpatch :(

> return class_register(&firmware_class);

And if that fails?

> }
>
> void unregister_sysfs_loader(void)
> {
> class_unregister(&firmware_class);
> + unregister_firmware_config_sysctl();
> }
>
> static ssize_t firmware_loading_show(struct device *dev,
> diff --git a/drivers/base/firmware_loader/fallback.h b/drivers/base/firmware_loader/fallback.h
> index 06f4577733a8..7d2cb5f6ceb8 100644
> --- a/drivers/base/firmware_loader/fallback.h
> +++ b/drivers/base/firmware_loader/fallback.h
> @@ -42,6 +42,17 @@ void fw_fallback_set_default_timeout(void);
>
> int register_sysfs_loader(void);
> void unregister_sysfs_loader(void);
> +#ifdef CONFIG_SYSCTL
> +extern int register_firmware_config_sysctl(void);
> +extern void unregister_firmware_config_sysctl(void);
> +#else
> +static inline int register_firmware_config_sysctl(void)
> +{
> + return 0;
> +}
> +static inline void unregister_firmware_config_sysctl(void) { }
> +#endif /* CONFIG_SYSCTL */
> +
> #else /* CONFIG_FW_LOADER_USER_HELPER */
> static inline int firmware_fallback_sysfs(struct firmware *fw, const char *name,
> struct device *device,
> diff --git a/drivers/base/firmware_loader/fallback_table.c b/drivers/base/firmware_loader/fallback_table.c
> index 46a731dede6f..4234aa5ee5df 100644
> --- a/drivers/base/firmware_loader/fallback_table.c
> +++ b/drivers/base/firmware_loader/fallback_table.c
> @@ -24,7 +24,7 @@ struct firmware_fallback_config fw_fallback_config = {
> EXPORT_SYMBOL_NS_GPL(fw_fallback_config, FIRMWARE_LOADER_PRIVATE);
>
> #ifdef CONFIG_SYSCTL
> -struct ctl_table firmware_config_table[] = {
> +static struct ctl_table firmware_config_table[] = {
> {
> .procname = "force_sysfs_fallback",
> .data = &fw_fallback_config.force_sysfs_fallback,
> @@ -45,4 +45,22 @@ struct ctl_table firmware_config_table[] = {
> },
> { }
> };
> -#endif
> +
> +static struct ctl_table_header *hdr;
> +int register_firmware_config_sysctl(void)
> +{
> + if (hdr)
> + return -EEXIST;

How can hdr be set?

> + hdr = register_sysctl_subdir("kernel", "firmware_config",
> + firmware_config_table);
> + if (!hdr)
> + return -ENOMEM;
> + return 0;
> +}
> +
> +void unregister_firmware_config_sysctl(void)
> +{
> + if (hdr)
> + unregister_sysctl_table(hdr);

Why can't unregister_sysctl_table() take a null pointer value?

And what sets 'hdr' (worst name for a static variable) to NULL so that
it knows not to be unregistered again as it looks like
register_firmware_config_sysctl() could be called multiple times.
thanks,

greg k-h

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