4.4-stable review patch. If anyone has any objections, please let me know.
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From: Johan Hovold johan@kernel.org
commit 9cb18db0701f6b74f0c45c23ad767b3ebebe37f6 upstream.
Fix child-node lookup during probe, which ended up searching the whole device tree depth-first starting at the parent rather than just matching on its children.
To make things worse, the parent display node was also prematurely freed.
Note that the display and timings node references are never put after a successful dt-initialisation so the nodes would leak on later probe deferrals and on driver unbind.
Fixes: b985172b328a ("video: atmel_lcdfb: add device tree suport") Cc: stable stable@vger.kernel.org # 3.13 Cc: Jean-Christophe PLAGNIOL-VILLARD plagnioj@jcrosoft.com Cc: Nicolas Ferre nicolas.ferre@microchip.com Cc: Alexandre Belloni alexandre.belloni@free-electrons.com Signed-off-by: Johan Hovold johan@kernel.org Signed-off-by: Bartlomiej Zolnierkiewicz b.zolnierkie@samsung.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/video/fbdev/atmel_lcdfb.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)
--- a/drivers/video/fbdev/atmel_lcdfb.c +++ b/drivers/video/fbdev/atmel_lcdfb.c @@ -1120,7 +1120,7 @@ static int atmel_lcdfb_of_init(struct at goto put_display_node; }
- timings_np = of_find_node_by_name(display_np, "display-timings"); + timings_np = of_get_child_by_name(display_np, "display-timings"); if (!timings_np) { dev_err(dev, "failed to find display-timings node\n"); ret = -ENODEV; @@ -1141,6 +1141,12 @@ static int atmel_lcdfb_of_init(struct at fb_add_videomode(&fb_vm, &info->modelist); }
+ /* + * FIXME: Make sure we are not referencing any fields in display_np + * and timings_np and drop our references to them before returning to + * avoid leaking the nodes on probe deferral and driver unbind. + */ + return 0;
put_timings_node: