Re: [PATCH V2] IB/qib: fix test of unsigned variable

[Doug Ledford <dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>]

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On Tue, 2015-05-12 at 12:32 -0400, Mike Marciniszyn wrote:
> Commit d4988623cc60 ("IB/qib: use arch_phys_wc_add()")
> adjusted mtrr inititialization to use the new interface.
> 
> Unfortunately, the new interface returns a signed
> value and the patch tested the unsigned wc_cookie.
> 
> Fix the issue by changing the type of wc_cookie to int.  For
> the success case the ret is changed to zero to avoid
> a warning from the caller.  For failure wc_cookie
> is used as the ret.
> 
> Signed-off-by: Mike Marciniszyn <mike.marciniszyn-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
> ---
>  drivers/infiniband/hw/qib/qib.h           |    2 +-
>  drivers/infiniband/hw/qib/qib_wc_x86_64.c |    8 ++++++--
>  2 files changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/infiniband/hw/qib/qib.h b/drivers/infiniband/hw/qib/qib.h
> index ba5173e2..7df16f7 100644
> --- a/drivers/infiniband/hw/qib/qib.h
> +++ b/drivers/infiniband/hw/qib/qib.h
> @@ -903,7 +903,7 @@ struct qib_devdata {
>  	/* PCI Device ID (here for NodeInfo) */
>  	u16 deviceid;
>  	/* for write combining settings */
> -	unsigned long wc_cookie;
> +	int wc_cookie;
>  	unsigned long wc_base;
>  	unsigned long wc_len;
>  
> diff --git a/drivers/infiniband/hw/qib/qib_wc_x86_64.c b/drivers/infiniband/hw/qib/qib_wc_x86_64.c
> index 6d61ef9..2f2e15a 100644
> --- a/drivers/infiniband/hw/qib/qib_wc_x86_64.c
> +++ b/drivers/infiniband/hw/qib/qib_wc_x86_64.c
> @@ -117,8 +117,12 @@ int qib_enable_wc(struct qib_devdata *dd)
>  
>  	if (!ret) {
>  		dd->wc_cookie = arch_phys_wc_add(pioaddr, piolen);
> -		if (dd->wc_cookie < 0)
> -			ret = -EINVAL;
> +		if (dd->wc_cookie >= 0)
> +			/* insure no warning on success */
> +			ret = 0;

This stanza has no meaning.  ret was already 0 or we wouldn't be in this
section, setting it again serves no purpose.  Just keep the original
code, but replace -EINVAL with dd->wc_cookie.

> +		else
> +			/* use error from routine */
> +			ret = dd->wc_cookie;
>  	}
>  
>  	return ret;
> 


-- 
Doug Ledford <dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
              GPG KeyID: 0E572FDD


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