linux-kernel - [PATCH v6 22/46] crypto: pcrypt - Protect access to cpu_online_mask with get/put_online

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Message-ID: <20130218124115.26245.88223.stgit@srivatsabhat.in.ibm.com>
Date:	Mon, 18 Feb 2013 18:11:15 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	tglx@...utronix.de, peterz@...radead.org, tj@...nel.org,
	oleg@...hat.com, paulmck@...ux.vnet.ibm.com, rusty@...tcorp.com.au,
	mingo@...nel.org, akpm@...ux-foundation.org, namhyung@...nel.org
Cc:	rostedt@...dmis.org, wangyun@...ux.vnet.ibm.com,
	xiaoguangrong@...ux.vnet.ibm.com, rjw@...k.pl, sbw@....edu,
	fweisbec@...il.com, linux@....linux.org.uk,
	nikunj@...ux.vnet.ibm.com, srivatsa.bhat@...ux.vnet.ibm.com,
	linux-pm@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linuxppc-dev@...ts.ozlabs.org, netdev@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	walken@...gle.com, vincent.guittot@...aro.org
Subject: [PATCH v6 22/46] crypto: pcrypt - Protect access to cpu_online_mask
 with get/put_online_cpus()

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@...unet.com>
Cc: Herbert Xu <herbert@...dor.apana.org.au>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: linux-crypto@...r.kernel.org
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
---

 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)
 
 	ictx->tfm_count++;
 
+	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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