linux-kernel - Re: [PATCH pci] PCI: dwc: fix inverted condition of DMA mask setup warning

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Date:   Wed, 23 Dec 2020 12:58:27 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Alexander Lobakin <alobakin@...me>, Vidya Sagar <vidyas@...dia.com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Jingoo Han <jingoohan1@...il.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Rob Herring <robh@...nel.org>,
        Robin Murphy <robin.murphy@....com>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH pci] PCI: dwc: fix inverted condition of DMA mask setup
 warning

On Tue, Dec 22, 2020 at 03:07:43PM +0000, Alexander Lobakin wrote:
> Commit 660c486590aa ("PCI: dwc: Set 32-bit DMA mask for MSI target
> address allocation") added dma_mask_set() call to explicitly set
> 32-bit DMA mask for MSI message mapping, but for now it throws a
> warning on ret == 0, while dma_set_mask() returns 0 in case of
> success.
> Fix this by inverting the condition.
> 
> Misc: remove redundant braces around single statement.
> 
> Fixes: 660c486590aa ("PCI: dwc: Set 32-bit DMA mask for MSI target address allocation")
> Signed-off-by: Alexander Lobakin <alobakin@...me>

I joined the string to make it greppable and applied to for-linus for
v5.11, thanks!

Vidya, speak up if this isn't right.  I assume you should have seen
this spurious warning while testing 660c486590aa.

> ---
>  drivers/pci/controller/dwc/pcie-designware-host.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
> index 516b151e0ef3..fa40cc2e376f 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> @@ -397,12 +397,11 @@ int dw_pcie_host_init(struct pcie_port *pp)
>  							    pp);
>  
>  			ret = dma_set_mask(pci->dev, DMA_BIT_MASK(32));
> -			if (!ret) {
> +			if (ret)
>  				dev_warn(pci->dev,
>  					 "Failed to set DMA mask to 32-bit. "
>  					 "Devices with only 32-bit MSI support"
>  					 " may not work properly\n");
> -			}
>  
>  			pp->msi_data = dma_map_single_attrs(pci->dev, &pp->msi_msg,
>  						      sizeof(pp->msi_msg),
> -- 
> 2.29.2
> 
>