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由 Anthony Liguori 提交于
When booting from v9fs, down_interruptible in p9_idpool_get() triggered a BUG as it was being called with IRQs disabled. A spinlock seems like the right thing to be using since the idr functions go out of their way not to sleep. This patch eliminates the BUG by converting the semaphore to a spinlock. Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com> Acked-by: NEric Van Hensbergen <ericvh@gmail.com>
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