Merge tag 'asoc-v5.4' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into for-next

ASoC: Updates for v5.4

Quite a big update this time around, particularly in the core
where we've had a lot of cleanups from Morimoto-san - there's
not much functional change but quite a bit of modernization
going on.  We've also seen a lot of driver work, a lot of it
cleanups but also some particular drivers.

 - Lots and lots of cleanups from Morimoto-san and Yue Haibing.
 - Lots of cleanups and enhancements to the Freescale, sunxi dnd
   Intel rivers.
 - Initial Sound Open Firmware suppot for i.MX8.
 - Removal of w90x900 and nuc900 drivers as the platforms are
   being removed.
 - New support for Cirrus Logic CS47L15 and CS47L92, Freescale
   i.MX 7ULP and 8MQ, Meson G12A and NXP UDA1334

1 files changed, 19 insertions, 0 deletions

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index ede7e7f5d1ab..6d7296dd11b8 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -3856,6 +3856,25 @@ retry:
 
 		page = alloc_huge_page(vma, haddr, 0);
 		if (IS_ERR(page)) {
+			/*
+			 * Returning error will result in faulting task being
+			 * sent SIGBUS.  The hugetlb fault mutex prevents two
+			 * tasks from racing to fault in the same page which
+			 * could result in false unable to allocate errors.
+			 * Page migration does not take the fault mutex, but
+			 * does a clear then write of pte's under page table
+			 * lock.  Page fault code could race with migration,
+			 * notice the clear pte and try to allocate a page
+			 * here.  Before returning error, get ptl and make
+			 * sure there really is no pte entry.
+			 */
+			ptl = huge_pte_lock(h, mm, ptep);
+			if (!huge_pte_none(huge_ptep_get(ptep))) {
+				ret = 0;
+				spin_unlock(ptl);
+				goto out;
+			}
+			spin_unlock(ptl);
 			ret = vmf_error(PTR_ERR(page));
 			goto out;
 		}