From: Corey Minyard <corey@minyard.net>
To: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Guenter Roeck <linux@roeck-us.net>,
Igor Raits <igor@gooddata.com>,
Jaroslav Pulchart <jaroslav.pulchart@gooddata.com>,
linux-acpi@vger.kernel.org, linux-hwmon@vger.kernel.org,
Daniel Secik <daniel.secik@gooddata.com>,
Zdenek Pesek <zdenek.pesek@gooddata.com>,
Jiri Jurica <jiri.jurica@gooddata.com>,
Huisong Li <lihuisong@huawei.com>
Subject: Re: [BISECTED - impi related]: acpi_power_meter: power*_average sysfs read hangs, mutex deadlock in hwmon_attr_show since v6.18.y
Date: Fri, 6 Feb 2026 10:08:45 -0600 [thread overview]
Message-ID: <aYYSDWaeiCnkwqAF@mail.minyard.net> (raw)
In-Reply-To: <CAJZ5v0i_BmeGROzQFpUCyF5MkA7sFkP3y8jjqH0mD2r2Wqj_xA@mail.gmail.com>
On Fri, Feb 06, 2026 at 01:08:56PM +0100, Rafael J. Wysocki wrote:
> On Thu, Feb 5, 2026 at 11:34 PM Guenter Roeck <linux@roeck-us.net> wrote:
> >
snip..
>
> > 2. Excessive Polling (Timer Overwrite):
> > In `smi_timeout()`, the timer is unconditionally reset to a short timeout (e.g., 10ms) at the end of the function, unless the state machine is IDLE. When the state machine returns `SI_SM_HOSED`, `smi_event_handler()` correctly sets the timer to a long backoff (1 second). However, `smi_timeout()` subsequently overwrites this with the short timeout. This causes the driver to poll the hosed BMC every 10ms instead of backing off for 1 second, resulting in unnecessary CPU overhead.
>
> Well, that's not nice, but it doesn't seem to be related to the
> observed symptoms.
I have a fix for this, too. Thanks for the report.
snip..
-corey
next prev parent reply other threads:[~2026-02-06 16:08 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-22 18:21 acpi_power_meter: power*_average sysfs read hangs, mutex deadlock in hwmon_attr_show since v6.18.y Jaroslav Pulchart
2026-01-22 18:55 ` Rafael J. Wysocki
2026-01-22 19:51 ` Guenter Roeck
2026-01-22 20:42 ` Rafael J. Wysocki
2026-01-22 22:28 ` Guenter Roeck
2026-01-23 10:19 ` Jaroslav Pulchart
2026-01-23 18:23 ` Guenter Roeck
2026-01-27 11:58 ` Jaroslav Pulchart
2026-01-27 14:24 ` Guenter Roeck
2026-01-29 15:26 ` Jaroslav Pulchart
2026-01-29 18:22 ` Guenter Roeck
2026-02-02 16:48 ` Jaroslav Pulchart
2026-02-02 18:00 ` Guenter Roeck
2026-02-02 18:14 ` Jaroslav Pulchart
2026-02-02 19:26 ` Rafael J. Wysocki
2026-02-03 0:26 ` Guenter Roeck
2026-02-03 8:23 ` Jaroslav Pulchart
2026-02-03 23:21 ` [BISECTED]: " Jaroslav Pulchart
2026-02-04 1:01 ` Guenter Roeck
2026-02-04 8:20 ` Jaroslav Pulchart
2026-02-04 19:54 ` Igor Raits
2026-02-04 22:48 ` Guenter Roeck
2026-02-05 7:25 ` Igor Raits
2026-02-05 17:51 ` Guenter Roeck
2026-02-05 19:04 ` Rafael J. Wysocki
2026-02-05 20:57 ` [BISECTED - impi related]: " Guenter Roeck
2026-02-06 12:08 ` Rafael J. Wysocki
2026-02-06 15:58 ` Corey Minyard
2026-02-06 19:33 ` Rafael J. Wysocki
2026-02-10 16:31 ` Rafael J. Wysocki
2026-02-12 9:10 ` Jaroslav Pulchart
2026-02-12 12:27 ` Rafael J. Wysocki
2026-02-12 16:48 ` Corey Minyard
2026-02-12 17:22 ` Rafael J. Wysocki
2026-02-12 18:34 ` Corey Minyard
2026-02-12 21:33 ` Rafael J. Wysocki
2026-02-12 22:06 ` Corey Minyard
2026-02-13 6:55 ` Corey Minyard
2026-02-13 12:47 ` Rafael J. Wysocki
2026-02-06 16:08 ` Corey Minyard [this message]
2026-02-06 16:31 ` Guenter Roeck
2026-02-06 19:35 ` Rafael J. Wysocki
2026-01-23 2:53 ` lihuisong (C)
2026-01-27 16:13 ` Guenter Roeck
2026-01-28 18:18 ` Guenter Roeck
2026-01-28 18:45 ` Rafael J. Wysocki
2026-01-28 19:52 ` Rafael J. Wysocki
2026-01-28 21:52 ` Guenter Roeck
2026-01-29 14:18 ` [PATCH v1] hwmon: (acpi_power_meter) Fix deadlocks related to acpi_power_meter_notify() Rafael J. Wysocki
2026-01-30 1:07 ` Guenter Roeck
2026-01-30 17:51 ` Rafael J. Wysocki
2026-01-30 18:51 ` Guenter Roeck
2026-01-30 1:47 ` lihuisong (C)
2026-01-30 5:07 ` Guenter Roeck
2026-01-30 8:40 ` lihuisong (C)
2026-01-30 17:53 ` Rafael J. Wysocki
2026-01-31 10:06 ` lihuisong (C)
2026-01-31 15:29 ` Guenter Roeck
2026-02-01 11:40 ` Rafael J. Wysocki
2026-01-29 1:55 ` acpi_power_meter: power*_average sysfs read hangs, mutex deadlock in hwmon_attr_show since v6.18.y lihuisong (C)
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