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__unflatten_device_tree() calls unflatten_dt_node(), which declares a static variable. It is therefore not reentrant. One of the callers of __unflatten_device_tree(), unflatten_device_tree(), is only called once during early initialization and does not need to be protected. The other caller, of_fdt_unflatten_tree(), can be called at any time, possibly multiple times in parallel. This can happen, for example, if multiple devicetree overlays have to be loaded and installed. Without this protection, errors such as the following may be seen. kernel: End of tree marker overwritten: e6a3a458 kernel: find_target_node: Failed to find target-indirect node at /fragment@0 kernel: __of_overlay_create: of_build_overlay_info() failed for tree@/ Add a mutex to of_fdt_unflatten_tree() to make the call reentrant. Cc: Pantelis Antoniou <pantelis.antoniou@konsulko.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Cc: stable@vger.kernel.org # v4.1+ Signed-off-by: Rob Herring <robh@kernel.org> |
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| .. | ||
| unittest-data | ||
| address.c | ||
| base.c | ||
| device.c | ||
| dynamic.c | ||
| fdt_address.c | ||
| fdt.c | ||
| irq.c | ||
| Kconfig | ||
| Makefile | ||
| of_mdio.c | ||
| of_mtd.c | ||
| of_net.c | ||
| of_pci_irq.c | ||
| of_pci.c | ||
| of_private.h | ||
| of_reserved_mem.c | ||
| overlay.c | ||
| pdt.c | ||
| platform.c | ||
| resolver.c | ||
| unittest.c | ||