| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <8a8a4c32-3c96-4c55-ac78-daffa00f87e3@gmx.de>
Date: Thu, 7 Nov 2024 09:53:28 +0100
From: Armin Wolf <W_Armin@....de>
To: Mario Limonciello <mario.limonciello@....com>,
Hans de Goede <hdegoede@...hat.com>,
Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: "Rafael J . Wysocki" <rafael@...nel.org>, Len Brown <lenb@...nel.org>,
Maximilian Luz <luzmaximilian@...il.com>, Lee Chun-Yi <jlee@...e.com>,
Shyam Sundar S K <Shyam-sundar.S-k@....com>,
Corentin Chary <corentin.chary@...il.com>, "Luke D . Jones"
<luke@...nes.dev>, Ike Panhc <ike.pan@...onical.com>,
Henrique de Moraes Holschuh <hmh@....eng.br>,
Alexis Belmonte <alexbelm48@...il.com>,
Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
Ai Chao <aichao@...inos.cn>, Gergo Koteles <soyer@....hu>,
open list <linux-kernel@...r.kernel.org>,
"open list:ACPI" <linux-acpi@...r.kernel.org>,
"open list:MICROSOFT SURFACE PLATFORM PROFILE DRIVER"
<platform-driver-x86@...r.kernel.org>,
"open list:THINKPAD ACPI EXTRAS DRIVER"
<ibm-acpi-devel@...ts.sourceforge.net>,
Mark Pearson <mpearson-lenovo@...ebb.ca>,
Matthew Schwartz <matthew.schwartz@...ux.dev>
Subject: Re: [PATCH v5 16/20] ACPI: platform_profile: Make sure all profile
handlers agree on profile
Am 07.11.24 um 07:02 schrieb Mario Limonciello:
> If for any reason multiple profile handlers don't agree on the profile
> return the custom profile.
>
> Tested-by: Mark Pearson <mpearson-lenovo@...ebb.ca>
> Reviewed-by: Mark Pearson <mpearson-lenovo@...ebb.ca>
> Signed-off-by: Mario Limonciello <mario.limonciello@....com>
> ---
> v5:
> * Notify class profile of change to legacy interface
> * Don't show warning when writing custom string, document in last patch
> instead.
> * Adjust mutex use
> ---
> drivers/acpi/platform_profile.c | 101 ++++++++++++++++++++++++--------
> 1 file changed, 76 insertions(+), 25 deletions(-)
>
> diff --git a/drivers/acpi/platform_profile.c b/drivers/acpi/platform_profile.c
> index b6f3388b4eef9..7f302ac4d3779 100644
> --- a/drivers/acpi/platform_profile.c
> +++ b/drivers/acpi/platform_profile.c
> @@ -94,6 +94,22 @@ static int _store_class_profile(struct device *dev, void *data)
> return err ? err : 0;
> }
>
> +/**
> + * _notify_class_profile - Notify the class device of a profile change
> + * @dev: The class device
> + * @data: Unused
> + */
> +static int _notify_class_profile(struct device *dev, void *data)
> +{
> + struct platform_profile_handler *handler = dev_get_drvdata(dev);
> +
> + lockdep_assert_held(&profile_lock);
> + sysfs_notify(&handler->class_dev->kobj, NULL, "platform_profile");
> + kobject_uevent(&handler->class_dev->kobj, KOBJ_CHANGE);
> +
> + return 0;
> +}
> +
> /**
> * get_class_profile - Show the current profile for a class device
> * @dev: The class device
> @@ -284,54 +300,89 @@ static ssize_t platform_profile_choices_show(struct device *dev,
> return _commmon_choices_show(aggregate, buf);
> }
>
> +/**
> + * _aggregate_profiles - Aggregate the profiles for legacy sysfs interface
> + * @dev: The device
> + * @data: The profile to return
> + * Return: 0 on success, -errno on failure
> + */
> +static int _aggregate_profiles(struct device *dev, void *data)
> +{
> + enum platform_profile_option *profile = data;
> + enum platform_profile_option val;
> + int err;
> +
> + err = get_class_profile(dev, &val);
> + if (err)
> + return err;
> +
> + if (*profile != PLATFORM_PROFILE_LAST && *profile != val)
> + *profile = PLATFORM_PROFILE_CUSTOM;
> + else
> + *profile = val;
> +
> + return 0;
> +}
> +
> +/**
> + * platform_profile_show - Show the current profile for legacy sysfs interface
> + * @dev: The device
> + * @attr: The attribute
> + * @buf: The buffer to write to
> + * Return: The number of bytes written
> + */
> static ssize_t platform_profile_show(struct device *dev,
> - struct device_attribute *attr,
> - char *buf)
> + struct device_attribute *attr,
> + char *buf)
> {
> - enum platform_profile_option profile = PLATFORM_PROFILE_BALANCED;
> + enum platform_profile_option profile = PLATFORM_PROFILE_LAST;
> int err;
>
> scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &profile_lock) {
> - if (!cur_profile)
> - return -ENODEV;
> -
> - err = cur_profile->profile_get(cur_profile, &profile);
> + err = class_for_each_device(&platform_profile_class, NULL,
> + &profile, _aggregate_profiles);
> if (err)
> return err;
> }
>
> - /* Check that profile is valid index */
> - if (WARN_ON((profile < 0) || (profile >= ARRAY_SIZE(profile_names))))
> - return -EIO;
> + /* no profile handler registered any more */
> + if (profile == PLATFORM_PROFILE_LAST)
> + return -EINVAL;
>
> return sysfs_emit(buf, "%s\n", profile_names[profile]);
> }
>
> +/**
> + * platform_profile_store - Set the profile for legacy sysfs interface
> + * @dev: The device
> + * @attr: The attribute
> + * @buf: The buffer to read from
> + * @count: The number of bytes to read
> + * Return: The number of bytes read
> + */
> static ssize_t platform_profile_store(struct device *dev,
> - struct device_attribute *attr,
> - const char *buf, size_t count)
> + struct device_attribute *attr,
> + const char *buf, size_t count)
> {
> - int err, i;
> + int ret;
> + int i;
>
> /* Scan for a matching profile */
> i = sysfs_match_string(profile_names, buf);
> - if (i < 0)
> + if (i < 0 || PLATFORM_PROFILE_CUSTOM)
This condition looks a bit weird.
> return -EINVAL;
>
> scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &profile_lock) {
> - if (!cur_profile)
> - return -ENODEV;
> -
> - /* Check that platform supports this profile choice */
> - if (!test_bit(i, cur_profile->choices))
> - return -EOPNOTSUPP;
> -
> - err = cur_profile->profile_set(cur_profile, i);
> - if (err)
> - return err;
> + ret = class_for_each_device(&platform_profile_class, NULL, &i,
> + _store_class_profile);
> + if (ret)
> + return ret;
> + ret = class_for_each_device(&platform_profile_class, NULL, NULL,
> + _notify_class_profile);
Please rework _store_class_profile() and _notify_class_profile() into:
- platform_profile_store(struct platform_profile_handler,enumplatform_profile_option option),
which is called by profile_store() while holding profile_lock.
- platform_profile_class_store(struct device *dev, void *data), which is used with class_for_each_device()
and internally calls platform_profile_store() and issues an notification on the "profile" (not "platform_profile"!)
class attribute and an uevent.
This allows you to avoid having to iterate through all platform profile handlers twice.
Thanks,
Armin Wolf
> + if (ret)
> + return ret;
> }
>
> - sysfs_notify(acpi_kobj, NULL, "platform_profile");
> return count;
> }
>
Powered by blists - more mailing lists