diff options
| author | Bryan O'Donoghue <pure.logic@nexus-software.ie> | 2017-07-28 16:22:57 +0300 |
|---|---|---|
| committer | Boris Brezillon <boris.brezillon@free-electrons.com> | 2017-08-02 11:26:40 +0300 |
| commit | 791eccd94965a8029ae09c5530bcb9a76794e408 (patch) | |
| tree | 0e2d8503a9d657df9a5fed39946d07dde81e1556 /drivers/mtd/nand/sunxi_nand.c | |
| parent | f7f8c1756e9a5f1258a7cc6b663f8451b724900f (diff) | |
| download | linux-791eccd94965a8029ae09c5530bcb9a76794e408.tar.xz | |
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>
Diffstat (limited to 'drivers/mtd/nand/sunxi_nand.c')
| -rw-r--r-- | drivers/mtd/nand/sunxi_nand.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/mtd/nand/sunxi_nand.c b/drivers/mtd/nand/sunxi_nand.c index d0b6f8f9f297..6abd142b1324 100644 --- 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 |