Re: [PATCH][v2] PCI: sysfs: Suppress FW_BUG warning when NUMA node already matches

[Bjorn Helgaas <helgaas@kernel.org>]

On Mon, Mar 16, 2026 at 08:28:03PM -0400, lirongqing wrote:
> From: Li RongQing <lirongqing@baidu.com>
> 
> The numa_node sysfs interface allows users to manually override a PCI
> device's NUMA node assignment. Currently, every write triggers a
> FW_BUG warning and taints the kernel, even when writing the same value
> that is already set.
> 
> Check if the requested node is already assigned to the device. If it
> matches, return success immediately without tainting the kernel or
> printing a warning.
> 
> Signed-off-by: Li RongQing <lirongqing@baidu.com>

Applied to pci/misc for v7.1, thanks!

> ---
> Diff with v1: invert the check and return if they are same 
> 
>  drivers/pci/pci-sysfs.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
> index 16eaaf7..dd7c9e5 100644
> --- a/drivers/pci/pci-sysfs.c
> +++ b/drivers/pci/pci-sysfs.c
> @@ -378,6 +378,9 @@ static ssize_t numa_node_store(struct device *dev,
>  	if (node != NUMA_NO_NODE && !node_online(node))
>  		return -EINVAL;
>  
> +	if (node == dev->numa_node)
> +		return count;
> +
>  	add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
>  	pci_alert(pdev, FW_BUG "Overriding NUMA node to %d.  Contact your vendor for updates.",
>  		  node);
> -- 
> 2.9.4
>