linux-kernel - [PATCH] crypto: hisilicon/qm - return failure if vfs

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Date:   Sat, 27 Aug 2022 18:27:56 +0800
From:   Weili Qian <qianweili@...wei.com>
To:     <herbert@...dor.apana.org.au>
CC:     <linux-kernel@...r.kernel.org>, <linux-crypto@...r.kernel.org>,
        <wangzhou1@...ilicon.com>, <liulongfang@...wei.com>
Subject: [PATCH] crypto: hisilicon/qm - return failure if vfs_num exceeds total VFs

The accelerator drivers supports users to enable VFs through the
module parameter 'vfs_num'. If the number of VFs to be enabled
exceeds the total VFs, all VFs are enabled. Change it to the same
as enabling VF through the 'sriov_numvfs' file. Returns -ERANGE
if the number of VFs to be enabled exceeds total VFs.

Signed-off-by: Weili Qian <qianweili@...wei.com>
---
 drivers/crypto/hisilicon/qm.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/crypto/hisilicon/qm.c b/drivers/crypto/hisilicon/qm.c
index fd9fb159048f..54bbd7fa57cc 100644
--- a/drivers/crypto/hisilicon/qm.c
+++ b/drivers/crypto/hisilicon/qm.c
@@ -4766,7 +4766,13 @@ int hisi_qm_sriov_enable(struct pci_dev *pdev, int max_vfs)
 		goto err_put_sync;
 	}
 
-	num_vfs = min_t(int, max_vfs, total_vfs);
+	if (max_vfs > total_vfs) {
+		pci_err(pdev, "%d VFs is more than total VFs %d!\n", max_vfs, total_vfs);
+		ret = -ERANGE;
+		goto err_put_sync;
+	}
+
+	num_vfs = max_vfs;
 	ret = qm_vf_q_assign(qm, num_vfs);
 	if (ret) {
 		pci_err(pdev, "Can't assign queues for VF!\n");
-- 
2.33.0