• Helge Deller's avatar
    parisc: ensure broadcast tlb purge runs single threaded · e82a3b75
    Helge Deller authored
    The TLB flushing functions on hppa, which causes PxTLB broadcasts on the system
    bus, needs to be protected by irq-safe spinlocks to avoid irq handlers to deadlock
    the kernel. The deadlocks only happened during I/O intensive loads and triggered
    pretty seldom, which is why this bug went so long unnoticed.
    Signed-off-by: default avatarHelge Deller <deller@gmx.de>
    [edited to use spin_lock_irqsave on UP as well since we'd been locking there
     all this time anyway, --kyle]
    Signed-off-by: default avatarKyle McMartin <kyle@mcmartin.ca>
    e82a3b75
pci-dma.c 15.6 KB