Hi, We observe a problem with MSI since kernel 2.6.21 where interrupts would randomly stop working. We have tracked it down to the new msi_set_mask_bit definition in 2.6.21. In the MSI case with a device not providing a "native" MSI mask, it was a no-op before, and now it disables MSI in the MSI-ctl register which according to the PCI spec is interpreted as reverting the device to legacy interrupts. If such a device try to generate a new interrupt during the "masked" window, the device will try a legacy interrupt which is generally ignored/never-acked and cause interrupts to no longer work for the device/driver combination (even after the enable bit is restored).
Is there anything apart from irq migration that strongly requires masking? Is is possible to do the irq migration without masking? Loic - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
