On Thu, Mar 30, 2023 at 05:53:56PM +0900, Damien Le Moal wrote: > pci_endpoint_test_irqhandler() always rewrites the status register when > an IRQ is raised, either as-is if STATUS_IRQ_RAISED is not set, or with > STATUS_IRQ_RAISED cleared if that flag is set. The first case creates a > race window with the endpoint side, meaning that the host side test > driver may end up reading what it just wrote, thus loosing the real > status as set by the endpoint side before raising the next interrupt. > This can prevent detecting that the STATUS_IRQ_RAISED flag was set by > the endpoint. s/loosing/losing/
