diff options
| author | Heiko Stuebner <heiko@sntech.de> | 2015-11-28 13:27:48 +0100 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2015-12-04 22:21:48 +0800 |
| commit | ac7c8e6b6dc959d285382c7e9cdfe608205f0c68 (patch) | |
| tree | aab53ef57ac6dfc64a10bfc00e64d9c81bfad4ee /drivers/crypto/rockchip | |
| parent | 1ab87298cb59b649d8d648d25dc15b36ab865f5a (diff) | |
| download | linux-ac7c8e6b6dc959d285382c7e9cdfe608205f0c68.tar.bz2 | |
crypto: rockchip - fix possible deadlock
Lockdep warns about a possible deadlock resulting from the use of regular
spin_locks:
=================================
[ INFO: inconsistent lock state ]
4.4.0-rc2+ #2724 Not tainted
---------------------------------
inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.
ksoftirqd/0/3 [HC0[0]:SC1[1]:HE1:SE0] takes:
(&(&crypto_info->lock)->rlock){+.?...}, at: [<bf14a65c>] rk_crypto_tasklet_cb+0x24/0xb4 [rk_crypto]
{SOFTIRQ-ON-W} state was registered at:
[<c007f4ac>] lock_acquire+0x178/0x218
[<c0759bac>] _raw_spin_lock+0x54/0x64
[<bf14af88>] rk_handle_req+0x7c/0xbc [rk_crypto]
[<bf14b040>] rk_des_ecb_encrypt+0x2c/0x30 [rk_crypto]
[<bf14b05c>] rk_aes_ecb_encrypt+0x18/0x1c [rk_crypto]
[<c028c820>] skcipher_encrypt_ablkcipher+0x64/0x68
[<c0290770>] __test_skcipher+0x2a8/0x8dc
[<c0292e94>] test_skcipher+0x38/0xc4
[<c0292fb0>] alg_test_skcipher+0x90/0xb0
[<c0292158>] alg_test+0x1e8/0x280
[<c028f6f4>] cryptomgr_test+0x34/0x54
[<c004bbe8>] kthread+0xf4/0x10c
[<c0010010>] ret_from_fork+0x14/0x24
irq event stamp: 10672
hardirqs last enabled at (10672): [<c002fac8>] tasklet_action+0x48/0x104
hardirqs last disabled at (10671): [<c002faa0>] tasklet_action+0x20/0x104
softirqs last enabled at (10658): [<c002ef84>] __do_softirq+0x358/0x49c
softirqs last disabled at (10669): [<c002f108>] run_ksoftirqd+0x40/0x80
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(&(&crypto_info->lock)->rlock);
<Interrupt>
lock(&(&crypto_info->lock)->rlock);
*** DEADLOCK ***
Fix this by moving to irq-disabling spinlocks.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto/rockchip')
| -rw-r--r-- | drivers/crypto/rockchip/rk3288_crypto.c | 5 | ||||
| -rw-r--r-- | drivers/crypto/rockchip/rk3288_crypto_ablkcipher.c | 10 |
2 files changed, 9 insertions, 6 deletions
diff --git a/drivers/crypto/rockchip/rk3288_crypto.c b/drivers/crypto/rockchip/rk3288_crypto.c index 6b72f8d2e643..da9c73dce4af 100644 --- a/drivers/crypto/rockchip/rk3288_crypto.c +++ b/drivers/crypto/rockchip/rk3288_crypto.c @@ -190,12 +190,13 @@ static void rk_crypto_tasklet_cb(unsigned long data) { struct rk_crypto_info *dev = (struct rk_crypto_info *)data; struct crypto_async_request *async_req, *backlog; + unsigned long flags; int err = 0; - spin_lock(&dev->lock); + spin_lock_irqsave(&dev->lock, flags); backlog = crypto_get_backlog(&dev->queue); async_req = crypto_dequeue_request(&dev->queue); - spin_unlock(&dev->lock); + spin_unlock_irqrestore(&dev->lock, flags); if (!async_req) { dev_err(dev->dev, "async_req is NULL !!\n"); return; diff --git a/drivers/crypto/rockchip/rk3288_crypto_ablkcipher.c b/drivers/crypto/rockchip/rk3288_crypto_ablkcipher.c index 4a8f9def0c8b..d98b681f6c06 100644 --- a/drivers/crypto/rockchip/rk3288_crypto_ablkcipher.c +++ b/drivers/crypto/rockchip/rk3288_crypto_ablkcipher.c @@ -24,6 +24,7 @@ static void rk_crypto_complete(struct rk_crypto_info *dev, int err) static int rk_handle_req(struct rk_crypto_info *dev, struct ablkcipher_request *req) { + unsigned long flags; int err; if (!IS_ALIGNED(req->nbytes, dev->align_size)) @@ -38,9 +39,9 @@ static int rk_handle_req(struct rk_crypto_info *dev, dev->aligned = 1; dev->ablk_req = req; - spin_lock(&dev->lock); + spin_lock_irqsave(&dev->lock, flags); err = ablkcipher_enqueue_request(&dev->queue, req); - spin_unlock(&dev->lock); + spin_unlock_irqrestore(&dev->lock, flags); tasklet_schedule(&dev->crypto_tasklet); return err; } @@ -267,12 +268,13 @@ static int rk_set_data_start(struct rk_crypto_info *dev) static int rk_ablk_start(struct rk_crypto_info *dev) { + unsigned long flags; int err; - spin_lock(&dev->lock); + spin_lock_irqsave(&dev->lock, flags); rk_ablk_hw_init(dev); err = rk_set_data_start(dev); - spin_unlock(&dev->lock); + spin_unlock_irqrestore(&dev->lock, flags); return err; } |