crypto: hisilicon/qm - add missing pci_dev_put() in q_num_set()

[ Upstream commit cc7710d ]

pci_get_device() will increase the reference count for the returned
pci_dev. We need to use pci_dev_put() to decrease the reference count
before q_num_set() returns.

Fixes: c8b4b47 ("crypto: hisilicon - add HiSilicon HPRE accelerator")
Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Reviewed-by: Weili Qian <qianweili@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/crypto/hisilicon/qm.h

@@ -318,14 +318,14 @@ struct hisi_qp {
 static inline int q_num_set(const char *val, const struct kernel_param *kp,
 			    unsigned int device)
 {
-	struct pci_dev *pdev = pci_get_device(PCI_VENDOR_ID_HUAWEI,
-					      device, NULL);
+	struct pci_dev *pdev;
 	u32 n, q_num;
 	int ret;
 
 	if (!val)
 		return -EINVAL;
 
+	pdev = pci_get_device(PCI_VENDOR_ID_HUAWEI, device, NULL);
 	if (!pdev) {
 		q_num = min_t(u32, QM_QNUM_V1, QM_QNUM_V2);
 		pr_info("No device found currently, suppose queue number is %u\n",
@@ -335,6 +335,8 @@ static inline int q_num_set(const char *val, const struct kernel_param *kp,
 			q_num = QM_QNUM_V1;
 		else
 			q_num = QM_QNUM_V2;
+
+		pci_dev_put(pdev);
 	}
 
 	ret = kstrtou32(val, 10, &n);