tree 6f4725c6a0ac6c093a1f6dc4077fb40865cf3882
parent c8dd5e456d2483f051bc92f9c67f01144d122a0b
author Gilad Ben-Yossef <gilad@benyossef.com> 1508310033 +0100
committer Herbert Xu <herbert@gondor.apana.org.au> 1509718276 +0800

crypto: change transient busy return code to -ENOSPC

The crypto API was using the -EBUSY return value to indicate
both a hard failure to submit a crypto operation into a
transformation provider when the latter was busy and the backlog
mechanism was not enabled as well as a notification that the
operation was queued into the backlog when the backlog mechanism
was enabled.

Having the same return code indicate two very different conditions
depending on a flag is both error prone and requires extra runtime
check like the following to discern between the cases:

	if (err == -EINPROGRESS ||
	    (err == -EBUSY && (ahash_request_flags(req) &
			       CRYPTO_TFM_REQ_MAY_BACKLOG)))

This patch changes the return code used to indicate a crypto op
failed due to the transformation provider being transiently busy
to -ENOSPC.

Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>