tree 2f11750e0420af56962e11ef0c7da69f03e24eb3
parent d6776bba44d9752f6cdf640046070e71ee4bba7b
author Michael Neuling <mikey@neuling.org> 1461301069 +1000
committer Michael Ellerman <mpe@ellerman.id.au> 1461722688 +1000

cxl: Poll for outstanding IRQs when detaching a context

When detaching contexts, we may still have interrupts in the system
which are yet to be delivered to any CPU and be acked in the PSL.
This can result in a subsequent unrelated process getting an spurious
IRQ or an interrupt for a non-existent context.

This polls the PSL to ensure that the PSL is clear of IRQs for the
detached context, before removing the context from the idr.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Tested-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Acked-by: Ian Munsie <imunsie@au1.ibm.com>
Tested-by: Vaibhav Jain <vaibhav@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>