From: Michael Walle Date: Wed, 7 Jul 2021 13:53:59 +0000 (+0200) Subject: mtd: core: handle flashes without OTP gracefully X-Git-Tag: v5.14-rc7~28^2~4 X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=45bb1faa29effbd4ca4d581b32373f2eda309b95;p=linux-block.git mtd: core: handle flashes without OTP gracefully There are flash drivers which registers the OTP callbacks although the flash doesn't support OTP regions and return -ENODATA for these callbacks if there is no OTP. If this happens, the probe of the whole flash will fail. Fix it by handling the ENODATA return code and skip the OTP region nvmem setup. Fixes: 4b361cfa8624 ("mtd: core: add OTP nvmem provider support") Reported-by: Guenter Roeck Signed-off-by: Michael Walle Tested-by: Guenter Roeck Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20210707135359.32398-1-michael@walle.cc --- diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c index b5ccd3037788..c8fd7f758938 100644 --- a/drivers/mtd/mtdcore.c +++ b/drivers/mtd/mtdcore.c @@ -806,7 +806,9 @@ static ssize_t mtd_otp_size(struct mtd_info *mtd, bool is_user) err: kfree(info); - return ret; + + /* ENODATA means there is no OTP region. */ + return ret == -ENODATA ? 0 : ret; } static struct nvmem_device *mtd_otp_nvmem_register(struct mtd_info *mtd,