linux-kernel - Re: [patch v6 6/7] PCI/MSI: Remove obsolete sanity checks for multiple interrupt sets

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Date:   Sun, 17 Feb 2019 21:39:43 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Christoph Hellwig <hch@....de>,
        Bjorn Helgaas <helgaas@...nel.org>,
        Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        Sagi Grimberg <sagi@...mberg.me>,
        linux-nvme@...ts.infradead.org, linux-pci@...r.kernel.org,
        Keith Busch <keith.busch@...el.com>,
        Marc Zyngier <marc.zyngier@....com>,
        Sumit Saxena <sumit.saxena@...adcom.com>,
        Kashyap Desai <kashyap.desai@...adcom.com>,
        Shivasharan Srikanteshwara 
        <shivasharan.srikanteshwara@...adcom.com>
Subject: Re: [patch v6 6/7] PCI/MSI: Remove obsolete sanity checks for
 multiple interrupt sets

On Sat, Feb 16, 2019 at 06:13:12PM +0100, Thomas Gleixner wrote:
> Multiple interrupt sets for affinity spreading are now handled in the core
> code and the number of sets and their size is recalculated via a driver
> supplied callback.
> 
> That avoids the requirement to invoke pci_alloc_irq_vectors_affinity() with
> the arguments minvecs and maxvecs set to the same value and the callsite
> handling the ENOSPC situation.
> 
> Remove the now obsolete sanity checks and the related comments.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> 
> ---
>  drivers/pci/msi.c |   14 --------------
>  1 file changed, 14 deletions(-)
> 
> --- a/drivers/pci/msi.c
> +++ b/drivers/pci/msi.c
> @@ -1035,13 +1035,6 @@ static int __pci_enable_msi_range(struct
>  	if (maxvec < minvec)
>  		return -ERANGE;
>  
> -	/*
> -	 * If the caller is passing in sets, we can't support a range of
> -	 * vectors. The caller needs to handle that.
> -	 */
> -	if (affd && affd->nr_sets && minvec != maxvec)
> -		return -EINVAL;
> -
>  	if (WARN_ON_ONCE(dev->msi_enabled))
>  		return -EINVAL;
>  
> @@ -1093,13 +1086,6 @@ static int __pci_enable_msix_range(struc
>  	if (maxvec < minvec)
>  		return -ERANGE;
>  
> -	/*
> -	 * If the caller is passing in sets, we can't support a range of
> -	 * supported vectors. The caller needs to handle that.
> -	 */
> -	if (affd && affd->nr_sets && minvec != maxvec)
> -		return -EINVAL;
> -
>  	if (WARN_ON_ONCE(dev->msix_enabled))
>  		return -EINVAL;
>  
> 
> 

Reviewed-by: Ming Lei <ming.lei@...hat.com>

Thanks,
Ming