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mtd: rawnand: Prevent sequential reads with on-die ECC engines

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commit a62c459795 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@vger.kernel.org
Fixes: 003fe4b954 ("mtd: rawnand: Support for sequential cache reads")
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Tested-by: Martin Hundebøll <martin@geanix.com>
Link: https://lore.kernel.org/linux-mtd/20231215123208.516590-4-miquel.raynal@bootlin.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Miquel Raynal 2023-12-15 13:32:07 +01:00 committed by Greg Kroah-Hartman
parent b1dca19b10
commit c376f862ec
1 changed files with 8 additions and 0 deletions
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8
drivers/mtd/nand/raw/nand_base.c
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@ -5171,6 +5171,14 @@ static void rawnand_late_check_supported_ops(struct nand_chip *chip)
/* 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;