Hello! I do not see any entry in MAINTAINERS file for pci-ftpci100.c driver, so I'm not sure to whom should I address this issue... During pci-aardvark review, Marc pointed one issue which is currently available also in pci-ftpci100.c driver. When masking or unmasking interrupts there is read-modify-write sequence for FARADAY_PCI_CTRL2 register without any locking and is not atomic: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/pci/controller/pci-ftpci100.c?h=v5.13#n270 So there is race condition when masking/unmasking more interrupts at the same time.
