linux-kernel - Re: [PATCH] drivers: staging: cxt1e1: hwprobe Fix different address spaces

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Message-ID: <20140321140133.GS25913@kryptos>
Date:	Fri, 21 Mar 2014 09:01:33 -0500
From:	Josh Cartwright <joshc@....teric.us>
To:	Matei Oprea <eu@...eamatei.ro>
Cc:	gregkh@...uxfoundation.org, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org,
	ROSEdu Kernel Community <firefly@...ts.rosedu.org>
Subject: Re: [PATCH] drivers: staging: cxt1e1: hwprobe Fix different address
 spaces

On Fri, Mar 21, 2014 at 03:52:23PM +0200, Matei Oprea wrote:
> Fix different address spaces when unmapping IO. hi->addr_mapped[0]
> and hi->addr_mapped[1] should be tagged __iomem.
> 
> Signed-off-by: Matei Oprea <eu@...eamatei.ro>
> Cc: ROSEdu Kernel Community <firefly@...ts.rosedu.org>
> ---
>  drivers/staging/cxt1e1/hwprobe.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/staging/cxt1e1/hwprobe.c b/drivers/staging/cxt1e1/hwprobe.c
> index 9b4198b..f55c27e 100644
> --- a/drivers/staging/cxt1e1/hwprobe.c
> +++ b/drivers/staging/cxt1e1/hwprobe.c
> @@ -174,12 +174,12 @@ cleanup_ioremap(void)
>  		if (hi->pci_slot == 0xff)
>  			break;
>  		if (hi->addr_mapped[0]) {
> -			iounmap((void *)(hi->addr_mapped[0]));
> +			iounmap((void __iomem *)(hi->addr_mapped[0]));

While this may "fix" the sparse warning, it's far from ideal.  Like I
had suggested on IRC, a much better cleanup would be to make the
addr_mapped member an array of __iomem-tagged pointers, and fixup the
users.

  Josh
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