Mellanox driver / cant access /prox/irq/XX/smp_affinity after upgrade from linux-4.13-rc4-next-20170811 to 4.13.0-rc5-next-20170815

Tue, 15 Aug 2017 05:23:17 -0700 

Hi
After upgrading kernel to latest next there is problem with accessing smp_affinity to write for mellanox driver 

For example - MEllanox:

cat /proc/interrupts | grep ml
217: 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 PCI-MSI 91750400-edge mlx5_pages_eq@pci:0000:af:00.0 218: 12237 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 PCI-MSI 91750401-edge mlx5_cmd_eq@pci:0000:af:00.0 

cat /proc/irq/218/smp_affinity
ffffff,ffffffff

echo  "ffffff,ffffffff " > /proc/irq/218/smp_affinity
-su: echo: write error: Input/output error


For intel ixgbe:
90: 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 PCI-MSI 12589056-edge enp24s0f3 

cat /proc/irq/90/smp_affinity
0003ff,f0003fff

 echo "0003ff,f0003fff" > /proc/irq/90/smp_affinity

Without errors.



BR

Pawel

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