From: Ben Hutchings <redacted>
Date: Sun, 11 Jul 2010 03:46:28 +0100

On Sat, 2010-07-10 at 20:18 +0900, Ken Kawasaki wrote:

quoted

axnet_cs:
    use spin_lock_irqsave instead of spin_lock in ax_interrupt

[...]

I assume this is because it's now called from ei_watchdog() and not only
from interrupt context.  Perhaps you should explain that in the commit
message.

No, interrupt handlers in general may not assume that interrupts
are off or on when they are invoked.

Therefore they must use irqflags saving/restoring.