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| author | Thomas Gleixner <tglx@linutronix.de> | 2016-12-26 22:58:19 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-12-26 17:30:24 -0800 |
| commit | b9d9d6911bd5c370ad4b3aa57d758c093d17aed5 (patch) | |
| tree | aa66dffa65f105ab98d5db3707c2262146d7fd8f /kernel/cpu.c | |
| parent | b4b8664d291ac1998e0f0bcdc96b6397f0fe68b3 (diff) | |
| download | lwn-b9d9d6911bd5c370ad4b3aa57d758c093d17aed5.tar.gz lwn-b9d9d6911bd5c370ad4b3aa57d758c093d17aed5.zip | |
smp/hotplug: Undo tglxs brainfart
The attempt to prevent overwriting an active state resulted in a
disaster which effectively disables all dynamically allocated hotplug
states.
Cleanup the mess.
Fixes: dc280d936239 ("cpu/hotplug: Prevent overwriting of callbacks")
Reported-by: Markus Trippelsdorf <markus@trippelsdorf.de>
Reported-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/cpu.c')
| -rw-r--r-- | kernel/cpu.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c index 042fd7e8e030..f75c4d031eeb 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -1471,6 +1471,7 @@ int __cpuhp_setup_state(enum cpuhp_state state, bool multi_instance) { int cpu, ret = 0; + bool dynstate; if (cpuhp_cb_check(state) || !name) return -EINVAL; @@ -1480,6 +1481,12 @@ int __cpuhp_setup_state(enum cpuhp_state state, ret = cpuhp_store_callbacks(state, name, startup, teardown, multi_instance); + dynstate = state == CPUHP_AP_ONLINE_DYN; + if (ret > 0 && dynstate) { + state = ret; + ret = 0; + } + if (ret || !invoke || !startup) goto out; @@ -1508,7 +1515,7 @@ out: * If the requested state is CPUHP_AP_ONLINE_DYN, return the * dynamically allocated state in case of success. */ - if (!ret && state == CPUHP_AP_ONLINE_DYN) + if (!ret && dynstate) return state; return ret; } |