Patch "Revert "Revert "mtd: rawnand: gpmi: Fix setting busy timeout setting""" has been added to the 5.4-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    Revert "Revert "mtd: rawnand: gpmi: Fix setting busy timeout setting""

to the 5.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     revert-revert-mtd-rawnand-gpmi-fix-setting-busy-timeout-setting.patch
and it can be found in the queue-5.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


From max.oss.09@gmail.com  Wed Feb 21 12:00:21 2024
From: max.oss.09@gmail.com
Date: Wed,  7 Feb 2024 18:49:11 +0100
Subject: Revert "Revert "mtd: rawnand: gpmi: Fix setting busy timeout setting""
To: stable@vger.kernel.org
Cc: gregkh@linuxfoundation.org, patches@lists.linux.dev, s.hauer@pengutronix.de, han.xu@nxp.com, tomasz.mon@camlingroup.com, richard@nod.at, tharvey@gateworks.com, linux-mtd@lists.infradead.org, Max Krummenacher <max.krummenacher@toradex.com>
Message-ID: <20240207174911.870822-2-max.oss.09@gmail.com>

From: Max Krummenacher <max.krummenacher@toradex.com>

This reverts commit 15a3adfe75937c9e4e0e48f0ed40dd39a0e526e2.

The backport of [1] relies on having [2] also backported. Having only
one of the two results in a bogus hw->timing1 setting.

If only [2] is backportet the 16 bit register value likely underflows
resulting in a busy_wait_timeout of 0.
Or if only [1] is applied the value likely overflows with chances of
having last 16 LSBs all 0 which would then result in a
busy_wait_timeout of 0 too.

Both cases may lead to NAND data corruption, e.g. on a Colibri iMX7
setup this has been seen.

[1] commit 0fddf9ad06fd ("mtd: rawnand: gpmi: Set WAIT_FOR_READY timeout based on program/erase times")
[2] commit 06781a5026350 ("mtd: rawnand: gpmi: Fix setting busy timeout setting")

Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c
+++ b/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c
@@ -684,7 +684,7 @@ static void gpmi_nfc_compute_timings(str
 	hw->timing0 = BF_GPMI_TIMING0_ADDRESS_SETUP(addr_setup_cycles) |
 		      BF_GPMI_TIMING0_DATA_HOLD(data_hold_cycles) |
 		      BF_GPMI_TIMING0_DATA_SETUP(data_setup_cycles);
-	hw->timing1 = BF_GPMI_TIMING1_BUSY_TIMEOUT(busy_timeout_cycles * 4096);
+	hw->timing1 = BF_GPMI_TIMING1_BUSY_TIMEOUT(DIV_ROUND_UP(busy_timeout_cycles, 4096));
 
 	/*
 	 * Derive NFC ideal delay from {3}:


Patches currently in stable-queue which might be from max.oss.09@gmail.com are

queue-5.4/revert-revert-mtd-rawnand-gpmi-fix-setting-busy-timeout-setting.patch