From 8e0629c1d4ce86ce7d98ca8756f42769bb17a3c8 Mon Sep 17 00:00:00 2001 From: Jan Beulich Date: Mon, 2 Jun 2014 14:58:25 +0100 Subject: [PATCH] swiotlb: don't assume PA 0 is invalid In 2.6.29 io_tlb_orig_addr[] got converted from storing virtual addresses to storing physical ones. While checking virtual addresses against NULL is a legitimate thing to catch invalid entries, checking physical ones against zero isn't: There's no guarantee that PFN 0 is reserved on a particular platform. Since it is unclear whether the check in swiotlb_tbl_unmap_single() is actually needed, retain it but check against a guaranteed invalid physical address. This requires setting up the array in a suitable fashion. And since the original code failed to invalidate array entries when regions get unmapped, this is being fixed at once along with adding a similar check to swiotlb_tbl_sync_single(). Obviously the less intrusive change would be to simply drop the check in swiotlb_tbl_unmap_single(). Signed-off-by: Jan Beulich Signed-off-by: Konrad Rzeszutek Wilk --- Reading git-format-patch failed