On Mon, Nov 13, 2017 at 03:39:48PM +0100, H. Nikolaus Schaller wrote:

Hi,

quoted

Am 13.11.2017 um 15:19 schrieb Johan Hovold [off-list ref]:

On Mon, Nov 13, 2017 at 04:10:52PM +0200, Peter Ujfalusi wrote:

quoted

On 2017-11-11 17:43, Johan Hovold wrote:

quoted

Fix child-node lookup during probe, which ended up searching the whole
device tree depth-first starting at parent rather than just matching on
its children.

Later sanity checks on node properties (which would likely be missing)
should prevent this from causing much trouble however, especially as the
original premature free of the parent node has already been fixed
separately (but that "fix" was apparently never backported to stable).

Fixes: e7ec014a47e4 ("Input: twl6040-vibra - update for device tree support")
Fixes: c52c545ead97 ("Input: twl6040-vibra - fix DT node memory management")
Cc: stable <redacted>     # 3.6

Note that of_get_child_by_name() is not present in 3.6, this was the
reason the original implementation was using of_find_node_by_name()

Ah, ok. So the lookup would have needed to be open-coded using
for_each_child_of_node() back then, or if anyone wants to backport any
of these fixes to before v3.7.

Just let me note that intensive DT support of OMAP4&5/ARM based boards didn't
start before ca. v3.13. So it is very unlikely that anyone is running a twl6040
based board with older kernels. It is different for twl4030/omap3 which was
used by several devices (N900, Pandora, GTA04) back in 2.6. So I don't
see a reason to backport this change to any kernel older than 3.16.

Right, and we don't really have any active stable trees going that far
back either (possibly with the exception of 3.2, but those guys are on
their own ;) ).

Thanks,
Johan