linux-kernel - Re: [Xen-devel] [PATCH 2/4] xen/pciback: Save the number of MSI-X entries to be copied later.

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Date:	Fri, 12 Feb 2016 02:25:22 -0700
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"Konrad Rzeszutek Wilk" <konrad.wilk@...cle.com>
Cc:	"Tommi Airikka" <tommi@...ikka.net>, <david.vrabel@...rix.com>,
	<xen-devel@...ts.xenproject.org>, <boris.ostrovsky@...cle.com>,
	<linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH 2/4] xen/pciback: Save the number of
 MSI-X entries to be copied later.

>>> On 11.02.16 at 22:10, <konrad.wilk@...cle.com> wrote:
> c/s  8135cf8b092723dbfcc611fe6fdcb3a36c9951c5
> "xen/pciback: Save xen_pci_op commands before processing it"
> would copyback the processed values - which was great.
> 
> However it missed the case that xen_pcibk_enable_msix - when
> completing would overwrite op->value (which had the number
> of MSI-X vectors requested) with the return value (which for
> success was zero). Hence the copy-back routine (which would use
> op->value) would copy exactly zero MSI-X vectors back.
> 
> CC: stable@...r.kernel.org 
> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>

Reviewed-by: Jan Beulich <jbeulich@...e.com>

but I'd prefer to see ...

> --- a/drivers/xen/xen-pciback/pciback_ops.c
> +++ b/drivers/xen/xen-pciback/pciback_ops.c
> @@ -335,7 +335,9 @@ void xen_pcibk_do_op(struct work_struct *data)
>  	struct xen_pcibk_dev_data *dev_data = NULL;
>  	struct xen_pci_op *op = &pdev->op;
>  	int test_intx = 0;
> -
> +#ifdef CONFIG_PCI_MSI
> +	unsigned int nr = 0;
> +#endif
>  	*op = pdev->sh_info->op;
>  	barrier();
>  	dev = xen_pcibk_get_pci_dev(pdev, op->domain, op->bus, op->devfn);

... the blank line separating declarations from statements to stay.

Jan