<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">From ebed787a0becb9354f0a23620a5130cccd6c730c Mon Sep 17 00:00:00 2001
From: Daniel Golle &lt;daniel@makrotopia.org&gt;
Date: Thu, 19 Jan 2023 03:45:43 +0000
Subject: [PATCH] mtd: spinand: macronix: use scratch buffer for DMA operation

The mx35lf1ge4ab_get_eccsr() function uses an SPI DMA operation to
read the eccsr, hence the buffer should not be on stack. Since commit
380583227c0c7f ("spi: spi-mem: Add extra sanity checks on the op param")
the kernel emmits a warning and blocks such operations.

Use the scratch buffer to get eccsr instead of trying to directly read
into a stack-allocated variable.

Signed-off-by: Daniel Golle &lt;daniel@makrotopia.org&gt;
Reviewed-by: Dhruva Gole &lt;d-gole@ti.com&gt;
Signed-off-by: Miquel Raynal &lt;miquel.raynal@bootlin.com&gt;
Link: https://lore.kernel.org/linux-mtd/Y8i85zM0u4XdM46z@makrotopia.org
---
 drivers/mtd/nand/spi/macronix.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/mtd/nand/spi/macronix.c
+++ b/drivers/mtd/nand/spi/macronix.c
@@ -83,9 +83,10 @@ static int mx35lf1ge4ab_ecc_get_status(s
 		 * in order to avoid forcing the wear-leveling layer to move
 		 * data around if it's not necessary.
 		 */
-		if (mx35lf1ge4ab_get_eccsr(spinand, &amp;eccsr))
+		if (mx35lf1ge4ab_get_eccsr(spinand, spinand-&gt;scratchbuf))
 			return nanddev_get_ecc_conf(nand)-&gt;strength;
 
+		eccsr = *spinand-&gt;scratchbuf;
 		if (WARN_ON(eccsr &gt; nanddev_get_ecc_conf(nand)-&gt;strength ||
 			    !eccsr))
 			return nanddev_get_ecc_conf(nand)-&gt;strength;
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