From: Dave Kleikamp <dave.kleikamp@oracle.com>
Date: Fri, 14 Jun 2013 20:54:09 +0000 (-0500)
Subject: iov_iter: iov_iter_copy_from_user() should use non-atomic copy
X-Git-Tag: next-20130822~107^2~31
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=0c7bfbc807e8a22a17ce46efcac9d9f03af3973d;p=karo-tx-linux.git

iov_iter: iov_iter_copy_from_user() should use non-atomic copy

Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
---

diff --git a/fs/iov-iter.c b/fs/iov-iter.c
index 52c23d9a1e12..563a6bab0a81 100644
--- a/fs/iov-iter.c
+++ b/fs/iov-iter.c
@@ -6,8 +6,8 @@
 #include <linux/highmem.h>
 #include <linux/pagemap.h>
 
-static size_t __iovec_copy_from_user_inatomic(char *vaddr,
-			const struct iovec *iov, size_t base, size_t bytes)
+static size_t __iovec_copy_from_user(char *vaddr, const struct iovec *iov,
+				     size_t base, size_t bytes, int atomic)
 {
 	size_t copied = 0, left = 0;
 
@@ -16,7 +16,10 @@ static size_t __iovec_copy_from_user_inatomic(char *vaddr,
 		int copy = min(bytes, iov->iov_len - base);
 
 		base = 0;
-		left = __copy_from_user_inatomic(vaddr, buf, copy);
+		if (atomic)
+			left = __copy_from_user_inatomic(vaddr, buf, copy);
+		else
+			left = __copy_from_user(vaddr, buf, copy);
 		copied += copy;
 		bytes -= copy;
 		vaddr += copy;
@@ -47,8 +50,8 @@ size_t iov_iter_copy_from_user_atomic(struct page *page,
 		left = __copy_from_user_inatomic(kaddr + offset, buf, bytes);
 		copied = bytes - left;
 	} else {
-		copied = __iovec_copy_from_user_inatomic(kaddr + offset,
-						i->iov, i->iov_offset, bytes);
+		copied = __iovec_copy_from_user(kaddr + offset, i->iov,
+						i->iov_offset, bytes, 1);
 	}
 	kunmap_atomic(kaddr);
 
@@ -75,8 +78,8 @@ size_t iov_iter_copy_from_user(struct page *page,
 		left = __copy_from_user(kaddr + offset, buf, bytes);
 		copied = bytes - left;
 	} else {
-		copied = __iovec_copy_from_user_inatomic(kaddr + offset,
-						i->iov, i->iov_offset, bytes);
+		copied = __iovec_copy_from_user(kaddr + offset, i->iov,
+						i->iov_offset, bytes, 0);
 	}
 	kunmap(page);
 	return copied;