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

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commit e5905ff128 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@intel.com>
Signed-off-by: Pawel Wodkowski <pawelx.wodkowski@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chuanxiao Dong
2016-01-21 13:57:51 +01:00
committed by Greg Kroah-Hartman
parent c8816bb0ed
commit 282d5f0567
1 changed files with 1 additions and 1 deletions
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2
drivers/mmc/core/debugfs.c
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@@ -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);