| 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: <8634a0f9-fe38-08f9-8a75-6b5b1bcd3b7e@linux.intel.com>
Date: Tue, 5 Nov 2024 17:54:08 +0200 (EET)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: Mario Limonciello <mario.limonciello@....com>
cc: Hans de Goede <hdegoede@...hat.com>,
"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 v4 08/20] ACPI: platform_profile: Use
`scoped_cond_guard`
On Tue, 5 Nov 2024, Mario Limonciello wrote:
> Migrate away from using an interruptible mutex to scoped_cond_guard
> in all functions.
>
> Reviewed-by: Mark Pearson <mpearson-lenovo@...ebb.ca>
> Signed-off-by: Mario Limonciello <mario.limonciello@....com>
> ---
> drivers/acpi/platform_profile.c | 114 ++++++++++++--------------------
> 1 file changed, 44 insertions(+), 70 deletions(-)
>
> diff --git a/drivers/acpi/platform_profile.c b/drivers/acpi/platform_profile.c
> index 4454c4a903c8f..fd1c4e9dccf0a 100644
> --- a/drivers/acpi/platform_profile.c
> +++ b/drivers/acpi/platform_profile.c
> @@ -27,25 +27,21 @@ static ssize_t platform_profile_choices_show(struct device *dev,
> char *buf)
> {
> int len = 0;
> - int err, i;
> -
> - err = mutex_lock_interruptible(&profile_lock);
> - if (err)
> - return err;
> -
> - if (!cur_profile) {
> - mutex_unlock(&profile_lock);
> - return -ENODEV;
> - }
> -
> - for_each_set_bit(i, cur_profile->choices, PLATFORM_PROFILE_LAST) {
> - if (len == 0)
> - len += sysfs_emit_at(buf, len, "%s", profile_names[i]);
> - else
> - len += sysfs_emit_at(buf, len, " %s", profile_names[i]);
> + int i;
> +
> + scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &profile_lock) {
> + if (!cur_profile)
> + return -ENODEV;
> +
> + for_each_set_bit(i, cur_profile->choices, PLATFORM_PROFILE_LAST) {
> + if (len == 0)
> + len += sysfs_emit_at(buf, len, "%s", profile_names[i]);
> + else
> + len += sysfs_emit_at(buf, len, " %s", profile_names[i]);
> + }
> }
> len += sysfs_emit_at(buf, len, "\n");
> - mutex_unlock(&profile_lock);
> +
> return len;
> }
>
> @@ -56,20 +52,15 @@ static ssize_t platform_profile_show(struct device *dev,
> enum platform_profile_option profile = PLATFORM_PROFILE_BALANCED;
> int err;
>
> - err = mutex_lock_interruptible(&profile_lock);
> - if (err)
> - return err;
> + scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &profile_lock) {
> + if (!cur_profile)
> + return -ENODEV;
>
> - if (!cur_profile) {
> - mutex_unlock(&profile_lock);
> - return -ENODEV;
> + err = cur_profile->profile_get(cur_profile, &profile);
> + if (err)
> + return err;
> }
>
> - err = cur_profile->profile_get(cur_profile, &profile);
> - mutex_unlock(&profile_lock);
> - if (err)
> - return err;
> -
> /* Check that profile is valid index */
> if (WARN_ON((profile < 0) || (profile >= ARRAY_SIZE(profile_names))))
> return -EIO;
> @@ -88,28 +79,20 @@ static ssize_t platform_profile_store(struct device *dev,
> if (i < 0)
> return -EINVAL;
>
> - err = mutex_lock_interruptible(&profile_lock);
> - if (err)
> - return err;
> + scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &profile_lock) {
> + if (!cur_profile)
> + return -ENODEV;
>
> - if (!cur_profile) {
> - mutex_unlock(&profile_lock);
> - return -ENODEV;
> - }
> + /* Check that platform supports this profile choice */
> + if (!test_bit(i, cur_profile->choices))
> + return -EOPNOTSUPP;
>
> - /* Check that platform supports this profile choice */
> - if (!test_bit(i, cur_profile->choices)) {
> - mutex_unlock(&profile_lock);
> - return -EOPNOTSUPP;
> + err = cur_profile->profile_set(cur_profile, i);
> + if (err)
> + return err;
> }
>
> - err = cur_profile->profile_set(cur_profile, i);
> - if (!err)
> - sysfs_notify(acpi_kobj, NULL, "platform_profile");
> -
> - mutex_unlock(&profile_lock);
> - if (err)
> - return err;
> + sysfs_notify(acpi_kobj, NULL, "platform_profile");
Hi Mario,
While I think it's fine, could you please mention about this move outside
of the lock in the commit message.
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
--
i.
> return count;
> }
>
> @@ -140,36 +123,27 @@ int platform_profile_cycle(void)
> enum platform_profile_option next;
> int err;
>
> - err = mutex_lock_interruptible(&profile_lock);
> - if (err)
> - return err;
> + scoped_cond_guard(mutex_intr, return -ERESTARTSYS, &profile_lock) {
> + if (!cur_profile)
> + return -ENODEV;
>
> - if (!cur_profile) {
> - mutex_unlock(&profile_lock);
> - return -ENODEV;
> - }
> + err = cur_profile->profile_get(cur_profile, &profile);
> + if (err)
> + return err;
>
> - err = cur_profile->profile_get(cur_profile, &profile);
> - if (err) {
> - mutex_unlock(&profile_lock);
> - return err;
> - }
> + next = find_next_bit_wrap(cur_profile->choices, PLATFORM_PROFILE_LAST,
> + profile + 1);
>
> - next = find_next_bit_wrap(cur_profile->choices, PLATFORM_PROFILE_LAST,
> - profile + 1);
> + if (WARN_ON(next == PLATFORM_PROFILE_LAST))
> + return -EINVAL;
>
> - if (WARN_ON(next == PLATFORM_PROFILE_LAST)) {
> - mutex_unlock(&profile_lock);
> - return -EINVAL;
> + err = cur_profile->profile_set(cur_profile, next);
> + if (err)
> + return err;
> }
>
> - err = cur_profile->profile_set(cur_profile, next);
> - mutex_unlock(&profile_lock);
> -
> - if (!err)
> - sysfs_notify(acpi_kobj, NULL, "platform_profile");
> -
> - return err;
> + sysfs_notify(acpi_kobj, NULL, "platform_profile");
> + return 0;
> }
> EXPORT_SYMBOL_GPL(platform_profile_cycle);
>
>
Powered by blists - more mailing lists