[PATCH 4/6] crypto: hisilicon/qm - check whether the input function and PF are on the same device

[Chenghai Huang <huangchenghai2@huawei.com>]

From: Zhushuai Yin <yinzhushuai@huawei.com>

Function rate limiting is set through physical function driver.
Users configure by providing function information and rate limit values.
Before configuration, it is necessary to check whether the
provided function and PF belong to the same device.

Fixes: 22d7a6c39cab ("crypto: hisilicon/qm - add pci bdf number check")
Signed-off-by: Zhushuai Yin <yinzhushuai@huawei.com>
Signed-off-by: Chenghai Huang <huangchenghai2@huawei.com>
---
 drivers/crypto/hisilicon/qm.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/crypto/hisilicon/qm.c b/drivers/crypto/hisilicon/qm.c
index a5cc0ccd94f1..2f96c673b60a 100644
--- a/drivers/crypto/hisilicon/qm.c
+++ b/drivers/crypto/hisilicon/qm.c
@@ -3826,6 +3826,10 @@ static ssize_t qm_get_qos_value(struct hisi_qm *qm, const char *buf,
 	}
 
 	pdev = container_of(dev, struct pci_dev, dev);
+	if (pci_physfn(pdev) != qm->pdev) {
+		pci_err(qm->pdev, "the pdev input does not match the pf!\n");
+		return -EINVAL;
+	}
 
 	*fun_index = pdev->devfn;
 
-- 
2.33.0