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linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org On 5/21/21 10:40 PM, Michael Walle wrote: > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe > > SPI NOR flashes will just ignore program commands if the OTP region is > locked. Thus, a user might not notice that the intended write didn't end > up in the flash. Return -EROFS to the user in this case. From what I can > tell, chips/cfi_cmdset_0001.c also return this error code. > > One could optimize spi_nor_mtd_otp_range_is_locked() to read the status > register only once and not for every OTP region, but for that we would > need some more invasive changes. Given that this is > one-time-programmable memory and the normal access mode is reading, we > just live with the small overhead. > > Fixes: 069089acf88b ("mtd: spi-nor: add OTP support") > Signed-off-by: Michael Walle > --- > drivers/mtd/spi-nor/otp.c | 35 +++++++++++++++++++++++++++++++++++ > 1 file changed, 35 insertions(+) > > diff --git a/drivers/mtd/spi-nor/otp.c b/drivers/mtd/spi-nor/otp.c > index 3898ed67ba1c..b87f96593c13 100644 > --- a/drivers/mtd/spi-nor/otp.c > +++ b/drivers/mtd/spi-nor/otp.c > @@ -249,6 +249,31 @@ static int spi_nor_mtd_otp_info(struct mtd_info *mtd, size_t len, > return ret; > } > > +static int spi_nor_mtd_otp_range_is_locked(struct spi_nor *nor, loff_t ofs, > + size_t len) > +{ > + const struct spi_nor_otp_ops *ops = nor->params->otp.ops; > + unsigned int region; > + int locked; > + > + if (!len) > + return 0; meh > + > + /* > + * If any of the affected OTP regions are locked the entire range is > + * considered locked. > + */ > + for (region = spi_nor_otp_offset_to_region(nor, ofs); > + region <= spi_nor_otp_offset_to_region(nor, ofs + len - 1); > + region++) { > + locked = ops->is_locked(nor, region); > + if (locked) > + return locked; > + } > + > + return 0; > +} > + > static int spi_nor_mtd_otp_read_write(struct mtd_info *mtd, loff_t ofs, > size_t total_len, size_t *retlen, > const u8 *buf, bool is_write) > @@ -271,6 +296,16 @@ static int spi_nor_mtd_otp_read_write(struct mtd_info *mtd, loff_t ofs, > /* don't access beyond the end */ > total_len = min_t(size_t, total_len, spi_nor_otp_size(nor) - ofs); can we move the total_len computation before calling spi_nor_lock_and_prep(), and just return 0 if total_len is zero? It will return early, avoiding unnecessary steps. > > + if (is_write) { > + ret = spi_nor_mtd_otp_range_is_locked(nor, ofs, total_len); > + if (ret < 0) { > + goto out; > + } else if (ret) { > + ret = -EROFS; > + goto out; > + } > + } > + > *retlen = 0; > while (total_len) { > /* > -- > 2.20.1 > ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/