FAILED: patch "[PATCH] mtd: rawnand: brcmnand: Fixed incorrect sub-page ECC status" failed to apply to 4.19-stable tree

The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 36415a7964711822e63695ea67fede63979054d9 Mon Sep 17 00:00:00 2001
From: david regan <[email protected]>
Date: Wed, 26 Jan 2022 23:43:44 +0100
Subject: [PATCH] mtd: rawnand: brcmnand: Fixed incorrect sub-page ECC status

The brcmnand driver contains a bug in which if a page (example 2k byte) is read from the parallel/ONFI NAND and within that page a subpage (512 byte) has correctable errors which is followed by a subpage with uncorrectable errors, the page read will return the wrong status of correctable (as opposed to the actual status of uncorrectable.)

The bug is in function brcmnand_read_by_pio where there is a check for uncorrectable bits which will be preempted if a previous status for correctable bits is detected.

The fix is to stop checking for bad bits only if we already have a bad bits status.

index f75929783b94..aee78f5f4f15 100644
@@ -2106,7 +2106,7 @@ static int brcmnand_read_by_pio(struct mtd_info *mtd, struct nand_chip *chip,
 					mtd->oobsize / trans,
 					host->hwcfg.sector_size_1k);
 
-		if (!ret) {
+		if (ret != -EBADMSG) {
 			*err_addr = brcmnand_get_uncorrecc_addr(ctrl);
 
 			if (*err_addr)