iio: Fix fwnode_handle in __fwnode_iio_channel_get_by_name()

stable inclusion
from stable-v6.6.64
commit 98e1f03de842d0e8cd6c1171f40ce7ba998290bd
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/IBL4B6

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=98e1f03de842d0e8cd6c1171f40ce7ba998290bd

--------------------------------

commit 3993ca4add248f0f853f54f9273a7de850639f33 upstream.

In the fwnode_iio_channel_get_by_name(), iterating over parent nodes to
acquire IIO channels via fwnode_for_each_parent_node(). The variable
chan was mistakenly attempted on the original node instead of the
current parent node. This patch corrects the logic to ensure that
__fwnode_iio_channel_get_by_name() is called with the correct parent
node.

Cc: [email protected] # v6.6+
Fixes: 1e64b9c ("iio: inkern: move to fwnode properties")
Signed-off-by: Zicheng Qu <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jonathan Cameron <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Signed-off-by: Wen Zhiwei <[email protected]>

Author: Zicheng Qu

drivers/iio/inkern.c

@@ -277,7 +277,7 @@ struct iio_channel *fwnode_iio_channel_get_by_name(struct fwnode_handle *fwnode,
 			return ERR_PTR(-ENODEV);
 		}
 
-		chan = __fwnode_iio_channel_get_by_name(fwnode, name);
+		chan = __fwnode_iio_channel_get_by_name(parent, name);
 		if (!IS_ERR(chan) || PTR_ERR(chan) != -ENODEV) {
 			fwnode_handle_put(parent);
  			return chan;