From: Judith Mendez <jm@ti.com>
Date: Wed, 13 May 2026 23:11:53 +0000 (-0500)
Subject: pinctrl: mcp23s08: Initialize mcp->dev and mcp->addr before regmap init
X-Git-Url: http://git.ipfire.org/gitweb/?a=commitdiff_plain;h=8473c3a197b57ff01396f7a2ec6ddf65383820d4;p=thirdparty%2Fkernel%2Flinux.git

pinctrl: mcp23s08: Initialize mcp->dev and mcp->addr before regmap init

Regmap initialization triggers regcache_maple_populate() which attempts
SPI read to populate cache. SPI read requires mcp->dev and mcp->addr to
be set, without them, NULL pointer dereference occurs during probe.

Move initialization before mcp23s08_spi_regmap_init() call.

Cc: stable@vger.kernel.org
Fixes: f9f4fda15e72 ("pinctrl: mcp23s08: init reg_defaults from HW at probe and switch cache type")
Signed-off-by: Judith Mendez <jm@ti.com>
Signed-off-by: Linus Walleij <linusw@kernel.org>
---

diff --git a/drivers/pinctrl/pinctrl-mcp23s08_spi.c b/drivers/pinctrl/pinctrl-mcp23s08_spi.c
index 54f61c8cb1c0f..5ed368772adb7 100644
--- a/drivers/pinctrl/pinctrl-mcp23s08_spi.c
+++ b/drivers/pinctrl/pinctrl-mcp23s08_spi.c
@@ -10,6 +10,7 @@
 #include "pinctrl-mcp23s08.h"
 
 #define MCP_MAX_DEV_PER_CS	8
+#define MCP23S08_SPI_BASE	0x40
 
 /*
  * A given spi_device can represent up to eight mcp23sxx chips
@@ -173,6 +174,8 @@ static int mcp23s08_probe(struct spi_device *spi)
 	for_each_set_bit(addr, &spi_present_mask, MCP_MAX_DEV_PER_CS) {
 		data->mcp[addr] = &data->chip[--chips];
 		data->mcp[addr]->irq = spi->irq;
+		data->mcp[addr]->dev = dev;
+		data->mcp[addr]->addr = MCP23S08_SPI_BASE | (addr << 1);
 
 		ret = mcp23s08_spi_regmap_init(data->mcp[addr], dev, addr, info);
 		if (ret)
@@ -184,7 +187,7 @@ static int mcp23s08_probe(struct spi_device *spi)
 		if (!data->mcp[addr]->pinctrl_desc.name)
 			return -ENOMEM;
 
-		ret = mcp23s08_probe_one(data->mcp[addr], dev, 0x40 | (addr << 1),
+		ret = mcp23s08_probe_one(data->mcp[addr], dev, MCP23S08_SPI_BASE | (addr << 1),
 					 info->type, -1);
 		if (ret < 0)
 			return ret;