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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


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             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

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