tree e35916b1be9404fb92e68b07f8b058d2fac51c7f
parent 9d82ef7e5c34ed84d4fd9e977bc8f2b8f94572a7
author Olav Haugan <ohaugan@codeaurora.org> 1367005828 -0700
committer Olav Haugan <ohaugan@codeaurora.org> 1367012323 -0700

iommu: msm: Ensure power is on in pg fault handler

There is a race condition between turning off the power to the IOMMU
and accessing registers in the page fault handler. The iommu detach
function might get called just after a page fault happens. The detach
function will turn off the regulators to the IOMMU. Since the page
fault handler is a threaded irq it might not run until after the
detach call has turned off the regulators.

Add a check in the page fault handler that power is still on before
accessing any IOMMU registers.

CRs-fixed: 480439
Change-Id: I3a4a5f4cb7bfa5e1418b68b1f9683df75e0f8038
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>