linux-kernel - Re: [PATCH] ipack: tpci200: change pci

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Message-ID: <CAD-N9QUveJWdK_zaAd6JTwWidMWap5Ri-bRe0n7QnCuBpMqbew@mail.gmail.com>
Date:   Fri, 27 Aug 2021 18:33:46 +0800
From:   Dongliang Mu <mudongliangabcd@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Samuel Iglesias Gonsalvez <siglesias@...lia.com>,
        Jens Taprogge <jens.taprogge@...rogge.org>,
        Lv Yunlong <lyl2019@...l.ustc.edu.cn>,
        Aditya Srivastava <yashsri421@...il.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        industrypack-devel@...ts.sourceforge.net,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ipack: tpci200: change pci_iounmap to iounmap

On Fri, Aug 27, 2021 at 6:00 PM Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> On Fri, Aug 27, 2021 at 05:43:47PM +0800, Dongliang Mu wrote:
> > The deallocation api for ioremap should be iounmap, other than
> > pci_iounmap.
>
> why?

Because the tpci200->info->cfg_regs/interface_regs is allocated by
ioremap. From my understanding, ioremap and iounmap are in pairs,
other than pci_iounmap.
See the code below.

tpci200->info->interface_regs =
ioremap(pci_resource_start(tpci200->info->pdev,
  TPCI200_IP_INTERFACE_BAR),
TPCI200_IFACE_SIZE);

https://elixir.bootlin.com/linux/latest/source/drivers/ipack/carriers/tpci200.c#L297

tpci200->info->cfg_regs = ioremap(
pci_resource_start(pdev, TPCI200_CFG_MEM_BAR),
pci_resource_len(pdev, TPCI200_CFG_MEM_BAR));

https://elixir.bootlin.com/linux/latest/source/drivers/ipack/carriers/tpci200.c#L546

If there is any issue, please let me know

>
> Isn't this a pci device?
>
> thanks,
>
> greg k-h