[PATCH v6 22/46] crypto: pcrypt - Protect access to cpu_online_maskwith get/put_online_cpus()

From: Srivatsa S. Bhat
Date: Mon Feb 18 2013 - 07:52:43 EST

The pcrypt_aead_init_tfm() function access the cpu_online_mask without
disabling CPU hotplug. And it looks like it can afford to sleep, so use
the get/put_online_cpus() APIs to protect against CPU hotplug.

Cc: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
Cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: linux-crypto@xxxxxxxxxxxxxxx
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@xxxxxxxxxxxxxxxxxx>

crypto/pcrypt.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/crypto/pcrypt.c b/crypto/pcrypt.c
index b2c99dc..10f64e2 100644
--- a/crypto/pcrypt.c
+++ b/crypto/pcrypt.c
@@ -280,12 +280,16 @@ static int pcrypt_aead_init_tfm(struct crypto_tfm *tfm)


+ get_online_cpus();
cpu_index = ictx->tfm_count % cpumask_weight(cpu_online_mask);

ctx->cb_cpu = cpumask_first(cpu_online_mask);
for (cpu = 0; cpu < cpu_index; cpu++)
ctx->cb_cpu = cpumask_next(ctx->cb_cpu, cpu_online_mask);

+ put_online_cpus();
cipher = crypto_spawn_aead(crypto_instance_ctx(inst));

if (IS_ERR(cipher))

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