Messages in this thread | | | Date | Tue, 29 May 2007 18:39:31 -0400 | From | Jeff Garzik <> | Subject | Re: b44: regression in 2.6.22 (resend) |
| |
Gary Zambrano wrote: > The b44 interrupt status reg returns a value of 0 if no interrupts are > pending. The b44 uses a mask to determine which bits (events) can > generate device interrupts on the system. If the masked interrupt status > register bits are not asserted, then the b44 will return to the system > with handled = 0. > So, I think the way the b44 interrupt code is written should be ok and > not a bug.
This is normal.
We check for 0xffffffff because that is often how a fault is indicated, when the memory location is read during or immediately after hotplug (or if the PCI bus is truly faulty). So for most hardware, you see
tmp = read(irq status) if (!tmp) return irq-none /* no irq events raised */ if (tmp == 0xffffffff) return irq-none /* hot unplug or h/w fault */
and the method that determines no interrupt handling is needed.
Regards,
Jeff
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |