On 11/20/2023 2:15 AM, Kang Yang wrote: > With VT-d disabled on Intel platform, ath12k gets only one MSI > vector. In that case, ath12k does not free IRQ when doing suspend, > hence the kernel has to migrate it to CPU0 (if it was affine to > other CPUs) and allocates a new MSI vector. However, ath12k has > no chance to reconfig it to HW srngs during this phase, thus > ath12k fails to resume. > > This issue can be fixed by setting IRQ affinity to CPU0 before > request_irq is called. With such affinity, migration will not > happen and thus the vector keeps unchanged during suspend/resume. > > Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0-03427-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.15378.4 > > Signed-off-by: Kang Yang <quic_kangyang@xxxxxxxxxxx> Acked-by: Jeff Johnson <quic_jjohnson@xxxxxxxxxxx>
