[dpdk-stable] [dpdk-dev] [PATCH v1] igb_uio: fix unexpected removal for hot-unplug

[Kevin Traynor]

On 10/18/2018 07:27 AM, Jeff Guo wrote:
> When a device is hot-unplugged, pci_remove will be invoked unexpectedly
> before pci_release, it will caused kernel hung issue which will throw the
> error info of "Trying to free already-free IRQ XXX". And on the other hand,
> if pci_remove before pci_release, the interrupt will not got chance to be
> disabled. So this patch aim to fix this issue by adding pci_release call
> in pci_remove, it will gurranty that all pci clean up will be done before
> pci removal.
> 

Hi, is this patch for the stable branch?

> Signed-off-by: Jeff Guo <jia.guo at intel.com>
> ---
>  kernel/linux/igb_uio/igb_uio.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/kernel/linux/igb_uio/igb_uio.c b/kernel/linux/igb_uio/igb_uio.c
> index fede66c..3cf394b 100644
> --- a/kernel/linux/igb_uio/igb_uio.c
> +++ b/kernel/linux/igb_uio/igb_uio.c
> @@ -570,6 +570,8 @@ igbuio_pci_remove(struct pci_dev *dev)
>  {
>  	struct rte_uio_pci_dev *udev = pci_get_drvdata(dev);
>  
> +	igbuio_pci_release(&udev->info, NULL);
> +
>  	sysfs_remove_group(&dev->dev.kobj, &dev_attr_grp);
>  	uio_unregister_device(&udev->info);
>  	igbuio_pci_release_iomem(&udev->info);
>