linux-kernel - Re: [PATCH v9 tty-next 2/4] serial: 8250_pci1xxxx: Add driver for quad-uart support

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Message-ID: <Y5xynsu2/89iMuqF@smile.fi.intel.com>
Date:   Fri, 16 Dec 2022 15:29:02 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Tharunkumar.Pasumarthi@...rochip.com
Cc:     Kumaravel.Thiagarajan@...rochip.com, linux-kernel@...r.kernel.org,
        linux-serial@...r.kernel.org, gregkh@...uxfoundation.org,
        jirislaby@...nel.org, ilpo.jarvinen@...ux.intel.com,
        macro@...am.me.uk, cang1@...e.co.uk, colin.i.king@...il.com,
        phil.edworthy@...esas.com, biju.das.jz@...renesas.com,
        geert+renesas@...der.be, lukas@...ner.de,
        u.kleine-koenig@...gutronix.de, wander@...hat.com,
        etremblay@...tech-controls.com, jk@...abs.org,
        UNGLinuxDriver@...rochip.com
Subject: Re: [PATCH v9 tty-next 2/4] serial: 8250_pci1xxxx: Add driver for
 quad-uart support

On Fri, Dec 16, 2022 at 10:31:38AM +0000, Tharunkumar.Pasumarthi@...rochip.com wrote:
> > From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> > Sent: Friday, December 16, 2022 3:09 PM
> > To: Tharunkumar Pasumarthi - I67821
> > <Tharunkumar.Pasumarthi@...rochip.com>
> > Subject: Re: [PATCH v9 tty-next 2/4] serial: 8250_pci1xxxx: Add driver for
> > quad-uart support
> > 
> > > From this sequence, it seemed like, kernel takes care of freeing irq
> > > and calling pci_free_irq_vectors is not required.
> > 
> > Technically you are correct, but... read this discussion, and pay attention to
> > what Christoph said there:
> > 
> > https://lore.kernel.org/linux-serial/0250c46e-da6c-71f3-50ae-
> > b7c17fd0bd2c@...mens.com/
> 
> Okay, got it. Will use pci_free_irq_vectors.  Also, do you suggest using
> pci_enable_device instead of pcim_enable_device (to maintain consistency of
> using non managed APIs throughout driver)?

Up to you. I don't see any issues with devm_ and pcim_ APIs, you can get my
opinion from the very same discussion and also another which tried to pursue
pcim_alloc_irq_vectors().

-- 
With Best Regards,
Andy Shevchenko