From: Artem Bityutskiy Date: Thu, 18 Oct 2007 17:09:41 +0000 (+0300) Subject: UBI: fix error code in ubi_io_read() X-Git-Tag: firefly_0821_release~22789^2~72 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=2362a53ec59f286495307e0e0d8ef2401e8c5c49;p=firefly-linux-kernel-4.4.55.git UBI: fix error code in ubi_io_read() When NAND detects an ECC error, it returns -EBADMSG. It does not stop reading requested data if one page has an ECC error, it keeps going and reads all the requested data. If it fails to read all the data, it does not return -EBADMSG, but returns the error code which reflects the reason of the failure. But some drivers may have bugs (e.g., OneNAND had) and stop reading after the first ECC error, so it returns -EBADMSG. In turn, UBI propagates this up to the caller. The caller will treat this as "all the requested data was read, but there was an ECC error". So we change the error code to -EIO if it is -EBADMSG and the read length is less then the requested length. We also add an assertion, so if UBI debugging is enabled, UBI will bug. Pointed-to-by: Adrian Hunter Signed-off-by: Artem Bityutskiy --- diff --git a/drivers/mtd/ubi/io.c b/drivers/mtd/ubi/io.c index 7c304eec78b5..db3efdef2433 100644 --- a/drivers/mtd/ubi/io.c +++ b/drivers/mtd/ubi/io.c @@ -173,6 +173,16 @@ retry: ubi_err("error %d while reading %d bytes from PEB %d:%d, " "read %zd bytes", err, len, pnum, offset, read); ubi_dbg_dump_stack(); + + /* + * The driver should never return -EBADMSG if it failed to read + * all the requested data. But some buggy drivers might do + * this, so we change it to -EIO. + */ + if (read != len && err == -EBADMSG) { + ubi_assert(0); + err = -EIO; + } } else { ubi_assert(len == read);