From 60c8f783a18feb95ad967c87e9660caf09fb4700 Mon Sep 17 00:00:00 2001 From: Ludovic Desroches Date: Wed, 6 May 2015 15:16:46 +0200 Subject: mmc: atmel-mci: fix bad variable type for clkdiv 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 Cc: # 3.4 and later Signed-off-by: Ulf Hansson --- drivers/mmc/host/atmel-mci.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) (limited to 'drivers/mmc') diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c index 03d7c7521d97..9a39e0b7e583 100644 --- a/drivers/mmc/host/atmel-mci.c +++ b/drivers/mmc/host/atmel-mci.c @@ -1304,7 +1304,7 @@ 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) { @@ -1328,7 +1328,12 @@ 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)); -- cgit v1.2.3