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

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Message-ID: <CAD-N9QU-zPU6EVaytsN1bEYqHQc1cDcXa4aXrPqg6VTwDkXb5w@mail.gmail.com>
Date:   Mon, 30 Aug 2021 09:22:04 +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 10:25 PM Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> On Fri, Aug 27, 2021 at 06:33:46PM +0800, Dongliang Mu wrote:
> > 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
>
> The point is that the driver should be calling pci_iomap_bar() instead
> of ioremap(), and then the call to pci_ioumap() is correct here.
>
> Please make that change instead.

No problem. I will modify the patch and send a v2 patch afterwards.

>
> thanks,
>
> greg k-h