sf: Guard against zero erasesize

With tiny SPI flash the erasesize is 0 which can cause a divide-by-zero
error. Check for this and return a proper error instead.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

diff --git a/drivers/mtd/spi/sf_probe.c b/drivers/mtd/spi/sf_probe.c
index e192f97..de6516f 100644 (file)
--- a/drivers/mtd/spi/sf_probe.c
+++ b/drivers/mtd/spi/sf_probe.c
@@ -189,7 +189,8 @@ static int spi_flash_std_erase(struct udevice *dev, u32 offset, size_t len)
        struct mtd_info *mtd = &flash->mtd;
        struct erase_info instr;
 
-       if (offset % mtd->erasesize || len % mtd->erasesize) {
+       if (!mtd->erasesize ||
+           (offset % mtd->erasesize || len % mtd->erasesize)) {
                debug("SF: Erase offset/length not multiple of erase size\n");
                return -EINVAL;
        }