As other examples show, read lock suffices although pages are being
written later on.
Signed-off-by: Phil Sutter <phil.sut...@viprinet.com>
---
zc.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/zc.c b/zc.c
index db28b58..884dbab 100644
--- a/zc.c
+++ b/zc.c
@@ -58,10 +58,10 @@ int __get_userbuf(uint8_t __user *addr, uint32_t len, int
write,
return 0;
}
- down_write(&mm->mmap_sem);
+ down_read(&mm->mmap_sem);
ret = get_user_pages(task, mm,
(unsigned long)addr, pgcount, write, 0, pg, NULL);
- up_write(&mm->mmap_sem);
+ up_read(&mm->mmap_sem);
if (ret != pgcount)
return -EINVAL;
--
1.7.8.6
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