commit 72c2d53192004845cbc19cd8a30b3212a9288140
author Al Viro <viro@zeniv.linux.org.uk> Sun Sep 22 16:27:52 2013 -0400
committer Al Viro <viro@zeniv.linux.org.uk> Thu Oct 24 23:34:54 2013 -0400
tree 31fcd924438f03d5aa09d13ffd813fb153da37c3
parent 22bd002ee76aa7d7a3393f39d977f6c106153c60

file->f_op is never NULL...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/read_write.c

diff --git a/fs/read_write.c b/fs/read_write.c
index e3cd280..58e440d 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -257,7 +257,7 @@
 
 	fn = no_llseek;
 	if (file->f_mode & FMODE_LSEEK) {
-		if (file->f_op && file->f_op->llseek)
+		if (file->f_op->llseek)
 			fn = file->f_op->llseek;
 	}
 	return fn(file, offset, whence);
@@ -384,7 +384,7 @@
 
 	if (!(file->f_mode & FMODE_READ))
 		return -EBADF;
-	if (!file->f_op || (!file->f_op->read && !file->f_op->aio_read))
+	if (!file->f_op->read && !file->f_op->aio_read)
 		return -EINVAL;
 	if (unlikely(!access_ok(VERIFY_WRITE, buf, count)))
 		return -EFAULT;
@@ -433,7 +433,7 @@
 	const char __user *p;
 	ssize_t ret;
 
-	if (!file->f_op || (!file->f_op->write && !file->f_op->aio_write))
+	if (!file->f_op->write && !file->f_op->aio_write)
 		return -EINVAL;
 
 	old_fs = get_fs();
@@ -460,7 +460,7 @@
 
 	if (!(file->f_mode & FMODE_WRITE))
 		return -EBADF;
-	if (!file->f_op || (!file->f_op->write && !file->f_op->aio_write))
+	if (!file->f_op->write && !file->f_op->aio_write)
 		return -EINVAL;
 	if (unlikely(!access_ok(VERIFY_READ, buf, count)))
 		return -EFAULT;
@@ -727,11 +727,6 @@
 	io_fn_t fn;
 	iov_fn_t fnv;
 
-	if (!file->f_op) {
-		ret = -EINVAL;
-		goto out;
-	}
-
 	ret = rw_copy_check_uvector(type, uvector, nr_segs,
 				    ARRAY_SIZE(iovstack), iovstack, &iov);
 	if (ret <= 0)
@@ -778,7 +773,7 @@
 {
 	if (!(file->f_mode & FMODE_READ))
 		return -EBADF;
-	if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
+	if (!file->f_op->aio_read && !file->f_op->read)
 		return -EINVAL;
 
 	return do_readv_writev(READ, file, vec, vlen, pos);
@@ -791,7 +786,7 @@
 {
 	if (!(file->f_mode & FMODE_WRITE))
 		return -EBADF;
-	if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
+	if (!file->f_op->aio_write && !file->f_op->write)
 		return -EINVAL;
 
 	return do_readv_writev(WRITE, file, vec, vlen, pos);
@@ -906,10 +901,6 @@
 	io_fn_t fn;
 	iov_fn_t fnv;
 
-	ret = -EINVAL;
-	if (!file->f_op)
-		goto out;
-
 	ret = -EFAULT;
 	if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
 		goto out;
@@ -965,7 +956,7 @@
 		goto out;
 
 	ret = -EINVAL;
-	if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
+	if (!file->f_op->aio_read && !file->f_op->read)
 		goto out;
 
 	ret = compat_do_readv_writev(READ, file, vec, vlen, pos);
@@ -1032,7 +1023,7 @@
 		goto out;
 
 	ret = -EINVAL;
-	if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
+	if (!file->f_op->aio_write && !file->f_op->write)
 		goto out;
 
 	ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);