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 stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From c5be12e45940f1aa1b5dfa04db5d15ad24f7c896 Mon Sep 17 00:00:00 2001
From: Miquel Raynal miquel.raynal@bootlin.com Date: Tue, 19 May 2020 14:59:45 +0200 Subject: [PATCH] mtd: rawnand: diskonchip: Fix the probe error path
Not sure nand_cleanup() is the right function to call here but in any case it is not nand_release(). Indeed, even a comment says that calling nand_release() is a bit of a hack as there is no MTD device to unregister. So switch to nand_cleanup() for now and drop this comment.
There is no Fixes tag applying here as the use of nand_release() in this driver predates by far the introduction of nand_cleanup() in commit d44154f969a4 ("mtd: nand: Provide nand_cleanup() function to free NAND related resources") which makes this change possible. However, pointing this commit as the culprit for backporting purposes makes sense even if it did not intruce any bug.
Fixes: d44154f969a4 ("mtd: nand: Provide nand_cleanup() function to free NAND related resources") Signed-off-by: Miquel Raynal miquel.raynal@bootlin.com Cc: stable@vger.kernel.org Link: https://lore.kernel.org/linux-mtd/20200519130035.1883-13-miquel.raynal@bootl...
diff --git a/drivers/mtd/nand/raw/diskonchip.c b/drivers/mtd/nand/raw/diskonchip.c index 97f0b05b47c1..f8ccee797645 100644 --- a/drivers/mtd/nand/raw/diskonchip.c +++ b/drivers/mtd/nand/raw/diskonchip.c @@ -1482,13 +1482,10 @@ static int __init doc_probe(unsigned long physadr) numchips = doc2001_init(mtd);
if ((ret = nand_scan(nand, numchips)) || (ret = doc->late_init(mtd))) { - /* DBB note: i believe nand_release is necessary here, as + /* DBB note: i believe nand_cleanup is necessary here, as buffers may have been allocated in nand_base. Check with Thomas. FIX ME! */ - /* nand_release will call mtd_device_unregister, but we - haven't yet added it. This is handled without incident by - mtd_device_unregister, as far as I can tell. */ - nand_release(nand); + nand_cleanup(nand); goto fail; }