linux-kernel - Re: [PATCH RESEND v3 0/7] rtc-cmos,rtc-mc146818-lib: fixes

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Message-ID: <YZgVHi5+i4qQIdvG@piout.net>
Date:   Fri, 19 Nov 2021 22:20:30 +0100
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Mateusz Jończyk <mat.jonczyk@...pl>
Cc:     linux-kernel@...r.kernel.org, linux-rtc@...r.kernel.org,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Greg KH <gregkh@...uxfoundation.org>
Subject: Re: [PATCH RESEND v3 0/7] rtc-cmos,rtc-mc146818-lib: fixes

Hello Mateusz,

I'm planning to review and take them soon (early next week), I found it
was a bit late for the previous version. I'd like that to sit in
linux-next for a while a rtc-cmos is kind of sensitive ;)

On 19/11/2021 21:42:14+0100, Mateusz Jończyk wrote:
> Hello,
> 
> This patch series fixes some issues in the RTC CMOS handling code:
> 
> 1. A missing spin_lock_irq() / spin_unlock_irq() pair in cmos_set_alarm().
> 2. A failing presence check of the RTC: the clock was misdetected as
>    broken since Linux 5.11 on one of our home systems.
> 3. Do not touch the RTC alarm registers when the RTC update is in
>    progress. (On some Intel chipsets, this causes bogus values being
>    read or writes to fail silently.)
> 
> This is my first patch series, so please review carefully.
> 
> v2: Drop the last patch:
>         Revert "rtc: cmos: Replace spin_lock_irqsave with spin_lock in hard IRQ"
> which was made obsolete by mainlining of 
> commit 13be2efc390a ("rtc: cmos: Disable irq around direct invocation of cmos_interrupt()")
> 
> v3: Rework solution to problem 3 (I'd like to thank Greg KH for comment),
> drop x86 refactoring patches (I'll send them later).
> 
> Greetings,
> Mateusz
> 
> Signed-off-by: Mateusz Jończyk <mat.jonczyk@...pl>
> Cc: Alessandro Zummo <a.zummo@...ertech.it>
> Cc: Alexandre Belloni <alexandre.belloni@...tlin.com>
> Cc: Greg KH <gregkh@...uxfoundation.org>

-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com