linux-kernel - [PATCH 3.16 09/63] mmc: debugfs: Add a restriction to mmc debugfs clock setting

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Date:   Wed, 08 Jan 2020 19:43:07 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Pawel Wodkowski" <pawelx.wodkowski@...el.com>,
        "Arnd Bergmann" <arnd@...db.de>,
        "Chuanxiao Dong" <chuanxiao.dong@...el.com>,
        "Ulf Hansson" <ulf.hansson@...aro.org>,
        "Yuan Juntao" <juntaox.yuan@...el.com>
Subject: [PATCH 3.16 09/63] mmc: debugfs: Add a restriction to mmc debugfs
 clock setting

3.16.81-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Chuanxiao Dong <chuanxiao.dong@...el.com>

commit e5905ff1281f0a0f5c9863c430ac1ed5faaf5707 upstream.

Clock frequency values written to an mmc host should not be less than
the minimum clock frequency which the mmc host supports.

Signed-off-by: Yuan Juntao <juntaox.yuan@...el.com>
Signed-off-by: Pawel Wodkowski <pawelx.wodkowski@...el.com>
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Cc: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/mmc/core/debugfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/mmc/core/debugfs.c
+++ b/drivers/mmc/core/debugfs.c
@@ -195,7 +195,7 @@ static int mmc_clock_opt_set(void *data,
 	struct mmc_host *host = data;
 
 	/* We need this check due to input value is u64 */
-	if (val > host->f_max)
+	if (val != 0 && (val > host->f_max || val < host->f_min))
 		return -EINVAL;
 
 	mmc_claim_host(host);