From: Chuanxiao Dong <chuanxiao.dong@intel.com>
Date: Thu, 21 Jan 2016 12:57:51 +0000 (+0100)
Subject: mmc: debugfs: Add a restriction to mmc debugfs clock setting
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=e5905ff1281f0a0f5c9863c430ac1ed5faaf5707;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

mmc: debugfs: Add a restriction to mmc debugfs clock setting

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@intel.com>
Signed-off-by: Pawel Wodkowski <pawelx.wodkowski@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
---

diff --git a/drivers/mmc/core/debugfs.c b/drivers/mmc/core/debugfs.c
index 65cc0ac9b82d..9382a57a5aa4 100644
--- a/drivers/mmc/core/debugfs.c
+++ b/drivers/mmc/core/debugfs.c
@@ -220,7 +220,7 @@ static int mmc_clock_opt_set(void *data, u64 val)
 	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);