pinctrl: renesas: rzg2l: Fix NULL pointer dereference in rzg2l_dt_subnode_to_map()

Fix the below random NULL pointer crash during boot by serializing
pinctrl group and function creation/remove calls in
rzg2l_dt_subnode_to_map() with mutex lock.

Crash log:
    pc : __pi_strcmp+0x20/0x140
    lr : pinmux_func_name_to_selector+0x68/0xa4
    Call trace:
    __pi_strcmp+0x20/0x140
    pinmux_generic_add_function+0x34/0xcc
    rzg2l_dt_subnode_to_map+0x314/0x44c
    rzg2l_dt_node_to_map+0x164/0x194
    pinctrl_dt_to_map+0x218/0x37c
    create_pinctrl+0x70/0x3d8

While at it, add comments for bitmap_lock and lock.

Fixes: c4c4637eb57f ("pinctrl: renesas: Add RZ/G2L pin and gpio controller driver")
Tested-by: Chris Paterson <Chris.Paterson2@renesas.com>
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20230815131558.33787-2-biju.das.jz@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

diff --git a/drivers/pinctrl/renesas/pinctrl-rzg2l.c b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
index b53d261..6e8a765 100644 (file)
--- a/drivers/pinctrl/renesas/pinctrl-rzg2l.c
+++ b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
@@ -11,6 +11,7 @@
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/module.h>
+#include <linux/mutex.h>
 #include <linux/of_device.h>
 #include <linux/of_irq.h>
 #include <linux/seq_file.h>
@@ -149,10 +150,11 @@ struct rzg2l_pinctrl {
        struct gpio_chip                gpio_chip;
        struct pinctrl_gpio_range       gpio_range;
        DECLARE_BITMAP(tint_slot, RZG2L_TINT_MAX_INTERRUPT);
-       spinlock_t                      bitmap_lock;
+       spinlock_t                      bitmap_lock; /* protect tint_slot bitmap */
        unsigned int                    hwirq[RZG2L_TINT_MAX_INTERRUPT];
 
-       spinlock_t                      lock;
+       spinlock_t                      lock; /* lock read/write registers */
+       struct mutex                    mutex; /* serialize adding groups and functions */
 };
 
 static const unsigned int iolh_groupa_mA[] = { 2, 4, 8, 12 };
@@ -362,11 +364,13 @@ static int rzg2l_dt_subnode_to_map(struct pinctrl_dev *pctldev,
                name = np->name;
        }
 
+       mutex_lock(&pctrl->mutex);
+
        /* Register a single pin group listing all the pins we read from DT */
        gsel = pinctrl_generic_add_group(pctldev, name, pins, num_pinmux, NULL);
        if (gsel < 0) {
                ret = gsel;
-               goto done;
+               goto unlock;
        }
 
        /*
@@ -380,6 +384,8 @@ static int rzg2l_dt_subnode_to_map(struct pinctrl_dev *pctldev,
                goto remove_group;
        }
 
+       mutex_unlock(&pctrl->mutex);
+
        maps[idx].type = PIN_MAP_TYPE_MUX_GROUP;
        maps[idx].data.mux.group = name;
        maps[idx].data.mux.function = name;
@@ -391,6 +397,8 @@ static int rzg2l_dt_subnode_to_map(struct pinctrl_dev *pctldev,
 
 remove_group:
        pinctrl_generic_remove_group(pctldev, gsel);
+unlock:
+       mutex_unlock(&pctrl->mutex);
 done:
        *index = idx;
        kfree(configs);
@@ -1509,6 +1517,7 @@ static int rzg2l_pinctrl_probe(struct platform_device *pdev)
 
        spin_lock_init(&pctrl->lock);
        spin_lock_init(&pctrl->bitmap_lock);
+       mutex_init(&pctrl->mutex);
 
        platform_set_drvdata(pdev, pctrl);