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From:   Kai Ye <yekai13@huawei.com>
To:     <herbert@gondor.apana.org.au>
CC:     <linux-crypto@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <wangzhou1@hisilicon.com>, <yekai13@huawei.com>
Subject: [PATCH] crypto: hisilicon - replace 'smp_processor_id' with 'get_cpu' in preemptible
Date:   Thu, 30 Sep 2021 16:55:46 +0800
Message-ID: <20210930085546.54000-1-yekai13@huawei.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 7BIT
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Precedence: bulk

smp_processor_id() is unsafe if it's used in a preemption-on critical
section. It will cause the call trace when the preemption-on and sets the
CONFIG_DEBUG_PREEMPT. So replace 'smp_processor_id' with 'get_cpu' in
preemptible to avoid the following call trace:

[ 7538.874350] BUG: using smp_processor_id() in preemptible [00000000] code: af_alg06/8438
[ 7538.874368] caller is debug_smp_processor_id+0x1c/0x28
[ 7538.874373] CPU: 50 PID: 8438 Comm: af_alg06 Kdump: loaded Not tainted 5.10.0.pc+ #18
[ 7538.874377] Call trace:
[ 7538.874387]  dump_backtrace+0x0/0x210
[ 7538.874389]  show_stack+0x2c/0x38
[ 7538.874392]  dump_stack+0x110/0x164
[ 7538.874394]  check_preemption_disabled+0xf4/0x108
[ 7538.874396]  debug_smp_processor_id+0x1c/0x28
[ 7538.874406]  sec_create_qps+0x24/0xe8 [hisi_sec2]
[ 7538.874408]  sec_ctx_base_init+0x20/0x4d8 [hisi_sec2]
[ 7538.874411]  sec_aead_ctx_init+0x68/0x180 [hisi_sec2]
[ 7538.874413]  sec_aead_sha256_ctx_init+0x28/0x38 [hisi_sec2]
[ 7538.874421]  crypto_aead_init_tfm+0x54/0x68
[ 7538.874423]  crypto_create_tfm_node+0x6c/0x110
[ 7538.874424]  crypto_alloc_tfm_node+0x74/0x288
[ 7538.874426]  crypto_alloc_aead+0x40/0x50
[ 7538.874431]  aead_bind+0x50/0xd0
[ 7538.874433]  alg_bind+0x94/0x148
[ 7538.874439]  __sys_bind+0x98/0x118
[ 7538.874441]  __arm64_sys_bind+0x28/0x38
[ 7538.874445]  do_el0_svc+0x88/0x258
[ 7538.874447]  el0_svc+0x1c/0x28
[ 7538.874449]  el0_sync_handler+0x8c/0xb8
[ 7538.874452]  el0_sync+0x148/0x180

Signed-off-by: Kai Ye <yekai13@huawei.com>
---
 drivers/crypto/hisilicon/hpre/hpre_main.c | 3 ++-
 drivers/crypto/hisilicon/sec2/sec_main.c  | 3 ++-
 drivers/crypto/hisilicon/zip/zip_main.c   | 6 ++++--
 3 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/crypto/hisilicon/hpre/hpre_main.c b/drivers/crypto/hisilicon/hpre/hpre_main.c
index 65a641396c07..d1754e7b7a9c 100644
--- a/drivers/crypto/hisilicon/hpre/hpre_main.c
+++ b/drivers/crypto/hisilicon/hpre/hpre_main.c
@@ -277,10 +277,11 @@ static inline int hpre_cluster_core_mask(struct hisi_qm *qm)
 
 struct hisi_qp *hpre_create_qp(u8 type)
 {
-	int node = cpu_to_node(smp_processor_id());
+	int node = cpu_to_node(get_cpu());
 	struct hisi_qp *qp = NULL;
 	int ret;
 
+	put_cpu();
 	if (type != HPRE_V2_ALG_TYPE && type != HPRE_V3_ECC_ALG_TYPE)
 		return NULL;
 
diff --git a/drivers/crypto/hisilicon/sec2/sec_main.c b/drivers/crypto/hisilicon/sec2/sec_main.c
index 90551bf38b52..e3a4d4f8637b 100644
--- a/drivers/crypto/hisilicon/sec2/sec_main.c
+++ b/drivers/crypto/hisilicon/sec2/sec_main.c
@@ -282,11 +282,12 @@ void sec_destroy_qps(struct hisi_qp **qps, int qp_num)
 
 struct hisi_qp **sec_create_qps(void)
 {
-	int node = cpu_to_node(smp_processor_id());
+	int node = cpu_to_node(get_cpu());
 	u32 ctx_num = ctx_q_num;
 	struct hisi_qp **qps;
 	int ret;
 
+	put_cpu();
 	qps = kcalloc(ctx_num, sizeof(struct hisi_qp *), GFP_KERNEL);
 	if (!qps)
 		return NULL;
diff --git a/drivers/crypto/hisilicon/zip/zip_main.c b/drivers/crypto/hisilicon/zip/zip_main.c
index 7148201ce76e..bdf2eff6d8bd 100644
--- a/drivers/crypto/hisilicon/zip/zip_main.c
+++ b/drivers/crypto/hisilicon/zip/zip_main.c
@@ -276,8 +276,10 @@ MODULE_DEVICE_TABLE(pci, hisi_zip_dev_ids);
 
 int zip_create_qps(struct hisi_qp **qps, int qp_num, int node)
 {
-	if (node == NUMA_NO_NODE)
-		node = cpu_to_node(smp_processor_id());
+	if (node == NUMA_NO_NODE) {
+		node = cpu_to_node(get_cpu());
+		put_cpu();
+	}
 
 	return hisi_qm_alloc_qps_node(&zip_devices, qp_num, 0, node, qps);
 }
-- 
2.33.0