linux-kernel - Re: [PATCH v1 1/2] i2c:busses:Register PCI1XXXX adapter to I2C subsystem

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Date:   Thu, 7 Oct 2021 19:30:55 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     LakshmiPraveen Kopparthi <LakshmiPraveen.Kopparthi@...rochip.com>
Cc:     UNGLinuxDriver@...rochip.com, wsa@...nel.org,
        andriy.shevchenko@...ux.intel.com, treding@...dia.com,
        mirq-linux@...e.qmqm.pl, s.shtylyov@....ru,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/2] i2c:busses:Register PCI1XXXX adapter to I2C
 subsystem

05.10.2021 11:50, LakshmiPraveen Kopparthi пишет:
>> Interrupt is disabled in ISR, this lock does nothing.
> 
> Ok. But there are some registers that are read and updated in the ISR
> and in the foreground.
> I will add the lock for these register access.

Please either add everything into a single patch or remove the unused code.

If you will need to add a lock, then like Michał Mirosław suggested in
the other reply, you won't need to store/restore IRQ flags in the
interrupt context.