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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>
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@ -897,9 +897,11 @@ int crypto_enqueue_request(struct crypto_queue *queue,
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int err = -EINPROGRESS;
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if (unlikely(queue->qlen >= queue->max_qlen)) {
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err = -EBUSY;
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if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
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if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) {
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err = -ENOSPC;
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goto out;
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}
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err = -EBUSY;
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if (queue->backlog == &queue->list)
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queue->backlog = &request->list;
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}
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@ -137,16 +137,14 @@ static int cryptd_enqueue_request(struct cryptd_queue *queue,
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int cpu, err;
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struct cryptd_cpu_queue *cpu_queue;
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atomic_t *refcnt;
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bool may_backlog;
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cpu = get_cpu();
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cpu_queue = this_cpu_ptr(queue->cpu_queue);
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err = crypto_enqueue_request(&cpu_queue->queue, request);
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refcnt = crypto_tfm_ctx(request->tfm);
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may_backlog = request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG;
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if (err == -EBUSY && !may_backlog)
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if (err == -ENOSPC)
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goto out_put_cpu;
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queue_work_on(cpu, kcrypto_wq, &cpu_queue->work);
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