From: Gavin Shan Date: Mon, 11 Aug 2014 09:16:19 +0000 (+1000) Subject: powerpc/pseries: Failure on removing device node X-Git-Tag: upstream/snapshot3+hdmi~1759 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=5a36b2d0a66165bdb1655cb0327c2aa108aaee66;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git powerpc/pseries: Failure on removing device node commit f1b3929c232784580e5d8ee324b6bc634e709575 upstream. While running command "drmgr -c phb -r -s 'PHB 528'", following backtrace jumped out because the target device node isn't marked with OF_DETACHED by of_detach_node(), which caused by error returned from memory hotplug related reconfig notifier when disabling CONFIG_MEMORY_HOTREMOVE. The patch fixes it. ERROR: Bad of_node_put() on /pci@800000020000210/ethernet@0 CPU: 14 PID: 2252 Comm: drmgr Tainted: G W 3.16.0+ #427 Call Trace: [c000000012a776a0] [c000000000013d9c] .show_stack+0x88/0x148 (unreliable) [c000000012a77750] [c00000000083cd34] .dump_stack+0x7c/0x9c [c000000012a777d0] [c0000000006807c4] .of_node_release+0x58/0xe0 [c000000012a77860] [c00000000038a7d0] .kobject_release+0x174/0x1b8 [c000000012a77900] [c00000000038a884] .kobject_put+0x70/0x78 [c000000012a77980] [c000000000681680] .of_node_put+0x28/0x34 [c000000012a77a00] [c000000000681ea8] .__of_get_next_child+0x64/0x70 [c000000012a77a90] [c000000000682138] .of_find_node_by_path+0x1b8/0x20c [c000000012a77b40] [c000000000051840] .ofdt_write+0x308/0x688 [c000000012a77c20] [c000000000238430] .proc_reg_write+0xb8/0xd4 [c000000012a77cd0] [c0000000001cbeac] .vfs_write+0xec/0x1f8 [c000000012a77d70] [c0000000001cc3b0] .SyS_write+0x58/0xa0 [c000000012a77e30] [c00000000000a064] syscall_exit+0x0/0x98 Signed-off-by: Gavin Shan Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Greg Kroah-Hartman --- diff --git a/arch/powerpc/platforms/pseries/hotplug-memory.c b/arch/powerpc/platforms/pseries/hotplug-memory.c index 9590dbb..b9a8204 100644 --- a/arch/powerpc/platforms/pseries/hotplug-memory.c +++ b/arch/powerpc/platforms/pseries/hotplug-memory.c @@ -160,7 +160,7 @@ static int pseries_remove_memory(struct device_node *np) static inline int pseries_remove_memblock(unsigned long base, unsigned int memblock_size) { - return -EOPNOTSUPP; + return 0; } static inline int pseries_remove_memory(struct device_node *np) {