Re: [PATCH] ipack: tpci200: change pci_iounmap to iounmap

[Greg Kroah-Hartman]

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@xxxxxxxxxxxxxxxxxxx> 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.

thanks,

greg k-h