mtd: nand: sunxi: fix potential divide-by-zero error

clk_round_rate() can return <= 0. Currently the value returned by
clk_round_rate() is used directly for a division. This patch introduces a
guard to ensure a divide-by-zero or a divide by a negative number for that
matter can't happen by bugging out returning -EINVAL if clk_round_rate()
returns <= 0.

Fixes: 2d43457f79e4 ("mtd: nand: sunxi: fix EDO mode selection")
Signed-off-by: Bryan O'Donoghue <pure.logic@nexus-software.ie>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>

diff --git a/drivers/mtd/nand/sunxi_nand.c b/drivers/mtd/nand/sunxi_nand.c
index d0b6f8f..6abd142 100644 (file)
--- a/drivers/mtd/nand/sunxi_nand.c
+++ b/drivers/mtd/nand/sunxi_nand.c
@@ -1728,6 +1728,10 @@ static int sunxi_nfc_setup_data_interface(struct mtd_info *mtd, int csline,
         */
        chip->clk_rate = NSEC_PER_SEC / min_clk_period;
        real_clk_rate = clk_round_rate(nfc->mod_clk, chip->clk_rate);
+       if (real_clk_rate <= 0) {
+               dev_err(nfc->dev, "Unable to round clk %lu\n", chip->clk_rate);
+               return -EINVAL;
+       }
 
        /*
         * ONFI specification 3.1, paragraph 4.15.2 dictates that EDO data