linux-kernel - [PATCH] crypto: qat: ratelimit invalid ioctl message and print the invalid cmd

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Message-Id: <20210622151608.23741-1-colin.king@canonical.com>
Date:   Tue, 22 Jun 2021 16:16:08 +0100
From:   Colin King <colin.king@...onical.com>
To:     Giovanni Cabiddu <giovanni.cabiddu@...el.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S . Miller" <davem@...emloft.net>,
        Qinglang Miao <miaoqinglang@...wei.com>, qat-linux@...el.com,
        linux-crypto@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] crypto: qat: ratelimit invalid ioctl message and print the invalid cmd

From: Colin Ian King <colin.king@...onical.com>

Currently incorrect QAT ioctls can spam the kernel log with error messages
of the form "QAT: Invalid ioctl" if a userspace program uses the wrong
ioctl command. Quench the messages by ratelimiting them and also print
the invalid command being used as that is useful to know.

Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/crypto/qat/qat_common/adf_ctl_drv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/crypto/qat/qat_common/adf_ctl_drv.c b/drivers/crypto/qat/qat_common/adf_ctl_drv.c
index 96b437bfe3de..6f64aa693146 100644
--- a/drivers/crypto/qat/qat_common/adf_ctl_drv.c
+++ b/drivers/crypto/qat/qat_common/adf_ctl_drv.c
@@ -406,7 +406,7 @@ static long adf_ctl_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
 		ret = adf_ctl_ioctl_get_status(fp, cmd, arg);
 		break;
 	default:
-		pr_err("QAT: Invalid ioctl\n");
+		pr_err_ratelimited("QAT: Invalid ioctl %d\n", cmd);
 		ret = -EFAULT;
 		break;
 	}
-- 
2.31.1