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authorDavid Hildenbrand <dahi@linux.vnet.ibm.com>2016-02-29 09:19:24 +0100
committerRich Felker <dalias@libc.org>2016-03-17 19:46:14 +0000
commitb15d53d009558d14c4f394a6d1fa2039c7f45c43 (patch)
tree05bc99e55e9192e0d35aeb26200251442ed2a4d2
parent044b81f872169e9549b47ea2b6c94491e6d5f305 (diff)
downloadlinux-sh-sh-for-4.6.tar.gz
sched/preempt, sh: kmap_coherent relies on disabled preemptiontag-sh-for-4.6sh-for-4.6
kmap_coherent needs disabled preemption to not schedule in the critical section, just like kmap_coherent on mips and kmap_atomic in general. Fixes: 8222dbe21e79 "sched/preempt, mm/fault: Decouple preemption from the page fault logic" Reported-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Tested-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Rich Felker <dalias@libc.org>
-rw-r--r--arch/sh/mm/kmap.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/sh/mm/kmap.c b/arch/sh/mm/kmap.c
index ec29e14ec5a8..bf25d7c79a2d 100644
--- a/arch/sh/mm/kmap.c
+++ b/arch/sh/mm/kmap.c
@@ -36,6 +36,7 @@ void *kmap_coherent(struct page *page, unsigned long addr)
BUG_ON(!test_bit(PG_dcache_clean, &page->flags));
+ preempt_disable();
pagefault_disable();
idx = FIX_CMAP_END -
@@ -64,4 +65,5 @@ void kunmap_coherent(void *kvaddr)
}
pagefault_enable();
+ preempt_enable();
}