From: Martin Devera <devik@eaxlabs.cz>
To: linux-kernel@vger.kernel.org
Cc: Christophe Kerello <christophe.kerello@st.com>,
Marek Vasut <marek.vasut@gmail.com>,
Richard Weinberger <richard@nod.at>,
Martin Devera <devik@eaxlabs.cz>,
Boris Brezillon <boris.brezillon@bootlin.com>,
linux-mtd@lists.infradead.org,
Miquel Raynal <miquel.raynal@bootlin.com>,
jan.pohanka@merz.cz, Brian Norris <computersforpeace@gmail.com>,
David Woodhouse <dwmw2@infradead.org>
Subject: [PATCH] mtd: rawnand: Fix unexpected timeouts in waitrdy
Date: Tue, 10 Dec 2019 16:03:18 +0100 [thread overview]
Message-ID: <20191210150319.3125-1-devik@eaxlabs.cz> (raw)
The used way to compute jiffies timeout brokes when
jiffie difference is 1. Simply add 1 - it has no other
side effects.
Fixes STM32MP1 FMC2 NAND controller which sometimes failed
exactly in this way.
Signed-off-by: Martin Devera <devik@eaxlabs.cz>
---
drivers/mtd/nand/raw/nand_base.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
index d527e448ce19..beab3a775cc7 100644
--- a/drivers/mtd/nand/raw/nand_base.c
+++ b/drivers/mtd/nand/raw/nand_base.c
@@ -721,7 +721,11 @@ int nand_soft_waitrdy(struct nand_chip *chip, unsigned long timeout_ms)
if (ret)
return ret;
- timeout_ms = jiffies + msecs_to_jiffies(timeout_ms);
+ /* +1 below is necessary because if we are now in the last fraction
+ * of jiffy and msecs_to_jiffies is 1 then we will wait only that
+ * small jiffy fraction - possibly leading to false timeout
+ */
+ timeout_ms = jiffies + msecs_to_jiffies(timeout_ms) + 1;
do {
ret = nand_read_data_op(chip, &status, sizeof(status), true);
if (ret)
--
2.11.0
______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/
next reply other threads:[~2019-12-10 15:04 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-10 15:03 Martin Devera [this message]
2020-01-09 15:37 ` [PATCH] mtd: rawnand: Fix unexpected timeouts in waitrdy Miquel Raynal
2020-01-09 16:17 ` Martin DEVERA
2020-01-09 17:22 ` Miquel Raynal
[not found] ` <0501ddbd-9e0f-62ec-ab57-d092502680d5@eaxlabs.cz>
2020-01-09 18:02 ` Miquel Raynal
2020-01-09 18:04 ` Miquel Raynal
2020-01-16 13:54 ` [PATCH] mtd: rawnand: Ensure nand_soft_waitrdy wait period is enough Martin Devera
2020-03-10 18:34 ` Miquel Raynal
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20191210150319.3125-1-devik@eaxlabs.cz \
--to=devik@eaxlabs.cz \
--cc=boris.brezillon@bootlin.com \
--cc=christophe.kerello@st.com \
--cc=computersforpeace@gmail.com \
--cc=dwmw2@infradead.org \
--cc=jan.pohanka@merz.cz \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mtd@lists.infradead.org \
--cc=marek.vasut@gmail.com \
--cc=miquel.raynal@bootlin.com \
--cc=richard@nod.at \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).