4.4-stable review patch. If anyone has any objections, please let me know.
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From: Chuanxiao Dong chuanxiao.dong@intel.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@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
--- 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 @@ -220,7 +220,7 @@ 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);