linux-kernel - Re: [PATCH v2 2/2] serial: 8250_lpss: Switch to pcim_iomap() instead of pci_ioremap

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Message-ID: <Ygy7dNqFLZF9XYiH@infradead.org>
Date:   Wed, 16 Feb 2022 00:53:08 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>
Subject: Re: [PATCH v2 2/2] serial: 8250_lpss: Switch to pcim_iomap() instead
 of pci_ioremap_bar()

On Tue, Feb 15, 2022 at 03:43:59PM +0200, Andy Shevchenko wrote:
> The pci_iounmap() doesn't cover all the cases where resource should
> be unmapped. Instead of spreading it more, replace the pci_ioremap_bar()
> with pcim_iomap() which uses managed resource approach.

pcim_iomap requires the use of ioreadX/iowriteX and thus runtime
overhead.  So in doubt please add a pcim_ioremap_bar instead of forcing
the legacy iomap/ioread/iowrite API onto modern drivers tht can't
support legacy port I/O.