[PATCH 6.7 025/346] mtd: rawnand: Prevent sequential reads with on-die ECC engines

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6.7-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>

commit a62c4597953fe54c6af04166a5e2872efd0e1490 upstream.

Some devices support sequential reads when using the on-die ECC engines,
some others do not. It is a bit hard to know which ones will break other
than experimentally, so in order to avoid such a difficult and painful
task, let's just pretend all devices should avoid using this
optimization when configured like this.

Cc: stable@xxxxxxxxxxxxxxx
Fixes: 003fe4b9545b ("mtd: rawnand: Support for sequential cache reads")
Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
Tested-by: Martin Hundebøll <martin@xxxxxxxxxx>
Link: https://lore.kernel.org/linux-mtd/20231215123208.516590-4-miquel.raynal@xxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/mtd/nand/raw/nand_base.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/drivers/mtd/nand/raw/nand_base.c
+++ b/drivers/mtd/nand/raw/nand_base.c
@@ -5170,6 +5170,14 @@ static void rawnand_late_check_supported
 	/* The supported_op fields should not be set by individual drivers */
 	WARN_ON_ONCE(chip->controller->supported_op.cont_read);
 
+	/*
+	 * Too many devices do not support sequential cached reads with on-die
+	 * ECC correction enabled, so in this case refuse to perform the
+	 * automation.
+	 */
+	if (chip->ecc.engine_type == NAND_ECC_ENGINE_TYPE_ON_DIE)
+		return;
+
 	if (!nand_has_exec_op(chip))
 		return;
 






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