linux-kernel - [PATCH 4.14 045/167] crypto: sun4i_ss_prng - convert lock to _bh in sun4i_ss_prng

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Message-Id: <20180221124527.039187962@linuxfoundation.org>
Date:   Wed, 21 Feb 2018 13:47:36 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Artem Savkov <artem.savkov@...il.com>,
        Herbert Xu <herbert@...dor.apana.org.au>
Subject: [PATCH 4.14 045/167] crypto: sun4i_ss_prng - convert lock to _bh in sun4i_ss_prng_generate

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Artem Savkov <artem.savkov@...il.com>

commit 2e7d1d61ea6c0f1c4da5eb82cafac750d55637a7 upstream.

Lockdep detects a possible deadlock in sun4i_ss_prng_generate() and
throws an "inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage" warning.
Disabling softirqs to fix this.

Fixes: b8ae5c7387ad ("crypto: sun4i-ss - support the Security System PRNG")
Signed-off-by: Artem Savkov <artem.savkov@...il.com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/crypto/sunxi-ss/sun4i-ss-prng.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/crypto/sunxi-ss/sun4i-ss-prng.c
+++ b/drivers/crypto/sunxi-ss/sun4i-ss-prng.c
@@ -28,7 +28,7 @@ int sun4i_ss_prng_generate(struct crypto
 	algt = container_of(alg, struct sun4i_ss_alg_template, alg.rng);
 	ss = algt->ss;
 
-	spin_lock(&ss->slock);
+	spin_lock_bh(&ss->slock);
 
 	writel(mode, ss->base + SS_CTL);
 
@@ -51,6 +51,6 @@ int sun4i_ss_prng_generate(struct crypto
 	}
 
 	writel(0, ss->base + SS_CTL);
-	spin_unlock(&ss->slock);
+	spin_unlock_bh(&ss->slock);
 	return 0;
 }