From: Ludovic Desroches <ludovic.desroches@xxxxxxxxx>
3.4.109-rc1 review patch. If anyone has any objections, please let me know.
------------------
commit 60c8f783a18feb95ad967c87e9660caf09fb4700 upstream.
clkdiv is declared as an u32 but it can be set to a negative value
causing a huge divisor value. Change its type to int to avoid this case.
Signed-off-by: Ludovic Desroches <ludovic.desroches@xxxxxxxxx>
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Signed-off-by: Zefan Li <lizefan@xxxxxxxxxx>
---
drivers/mmc/host/atmel-mci.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
index e6f08d9..c300cc4 100644
--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -1125,7 +1125,7 @@ static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
if (ios->clock) {
unsigned int clock_min = ~0U;
- u32 clkdiv;
+ int clkdiv;
spin_lock_bh(&host->lock);
if (!host->mode_reg) {
@@ -1150,7 +1150,12 @@ static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
/* Calculate clock divider */
if (host->caps.has_odd_clk_div) {
clkdiv = DIV_ROUND_UP(host->bus_hz, clock_min) - 2;
- if (clkdiv > 511) {
+ if (clkdiv < 0) {
+ dev_warn(&mmc->class_dev,
+ "clock %u too fast; using %lu\n",
+ clock_min, host->bus_hz / 2);
+ clkdiv = 0;
+ } else if (clkdiv > 511) {
dev_warn(&mmc->class_dev,
"clock %u too slow; using %lu\n",
clock_min, host->bus_hz / (511 + 2));
--
1.9.1
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