While backporting an upstream patch to one of our older distro kernels I've found a weird locking hierarchy in the virtio crypto driver:
virtio_config_changed():
spin_lock_irqsave()
->__virtio_config_changed()
->drv->config_changed() <- assume drv == virtio_crypto_driver
virtcrypto_config_changed():
->virtcrypto_update_status()
->virtcrypto_dev_start()
->virtio_crypto_skcipher_algs_register()
mutex_lock()
I don't think trying to take a mutex while holding a spinlock with interrupts
disabled is a proper thing to do.
Am I overlooking something here?
Juergen
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