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authorSebastian Andrzej Siewior <bigeasy@linutronix.de>2017-06-02 16:27:14 +0200
committerThomas Gleixner <tglx@linutronix.de>2017-06-03 09:35:04 +0200
commit40da1b11f01e43aad1aa6cea64681b6125e8a2a7 (patch)
tree8a7c467a91c77dcab9f1102b1a3ad755c7c4ea9b /Documentation
parent104c08ba8e921ef97abfdc10408d54921a6d9003 (diff)
cpu/hotplug: Drop the device lock on error
If a custom CPU target is specified and that one is not available _or_ can't be interrupted then the code returns to userland without dropping a lock as notices by lockdep: |echo 133 > /sys/devices/system/cpu/cpu7/hotplug/target | ================================================ | [ BUG: lock held when returning to user space! ] | ------------------------------------------------ | bash/503 is leaving the kernel with locks still held! | 1 lock held by bash/503: | #0: (device_hotplug_lock){+.+...}, at: [<ffffffff815b5650>] lock_device_hotplug_sysfs+0x10/0x40 So release the lock then. Fixes: 757c989b9994 ("cpu/hotplug: Make target state writeable") Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: stable@vger.kernel.org Link: http://lkml.kernel.org/r/20170602142714.3ogo25f2wbq6fjpj@linutronix.de
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