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hwrng: fix unregister race.

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The previous patch added one potential problem: we can still be
reading from a hwrng when it's unregistered.  Add a wait for zero
in the hwrng_unregister path.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Amos Kong <akong@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Rusty Russell 2014-12-08 16:50:38 +08:00 • committed by Herbert Xu
parent 3a2c0ba5ad
commit a027f30d72
2 changed files with 13 additions and 0 deletions
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1
include/linux/hw_random.h
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@ -46,6 +46,7 @@ struct hwrng {
/* internal. */
struct list_head list;
struct kref ref;
bool cleanup_done;
};
/** Register a new Hardware Random Number Generator driver. */