@@ -11,6 +11,7 @@
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
+#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
@@ -153,6 +154,7 @@ struct rzg2l_pinctrl {
unsigned int hwirq[RZG2L_TINT_MAX_INTERRUPT];
spinlock_t lock;
+ struct mutex mutex; /* serialize adding groups and functions */
};
static const unsigned int iolh_groupa_mA[] = { 2, 4, 8, 12 };
@@ -362,10 +364,12 @@ 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;
+ mutex_unlock(&pctrl->mutex);
goto done;
}
@@ -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 +397,7 @@ static int rzg2l_dt_subnode_to_map(struct pinctrl_dev *pctldev,
remove_group:
pinctrl_generic_remove_group(pctldev, gsel);
+ mutex_unlock(&pctrl->mutex);
done:
*index = idx;
kfree(configs);
@@ -1503,6 +1510,7 @@ 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);
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 logs: 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 Fixes: c4c4637eb57f ("pinctrl: renesas: Add RZ/G2L pin and gpio controller driver") Cc: stable@kernel.org Tested-by: Chris Paterson <Chris.Paterson2@renesas.com> Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com> --- v1->v2: * Updated crash logs as per submitting patches doc. --- drivers/pinctrl/renesas/pinctrl-rzg2l.c | 8 ++++++++ 1 file changed, 8 insertions(+)