This is a note to let you know that I've just added the patch titled
irqchip/renesas-rzg2l: Fix missing put_device
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
irqchip-renesas-rzg2l-fix-missing-put_device.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 5c0b32edd8d8c889fcee25db19f8c33729bc658b
Author: Fabrizio Castro <fabrizio.castro.jz@xxxxxxxxxxx>
Date: Fri Oct 11 18:20:03 2024 +0100
irqchip/renesas-rzg2l: Fix missing put_device
[ Upstream commit d038109ac1c6bf619473dda03a16a6de58170f7f ]
rzg2l_irqc_common_init() calls of_find_device_by_node(), but the
corresponding put_device() call is missing. This also gets reported by
make coccicheck.
Make use of the cleanup interfaces from cleanup.h to call into
__free_put_device(), which in turn calls into put_device when leaving
function rzg2l_irqc_common_init() and variable "dev" goes out of scope.
To prevent that the device is put on successful completion, assign NULL to
"dev" to prevent __free_put_device() from calling into put_device() within
the successful path.
"make coccicheck" will still complain about missing put_device() calls,
but those are false positives now.
Fixes: 3fed09559cd8 ("irqchip: Add RZ/G2L IA55 Interrupt Controller driver")
Signed-off-by: Fabrizio Castro <fabrizio.castro.jz@xxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/all/20241011172003.1242841-1-fabrizio.castro.jz@xxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/irqchip/irq-renesas-rzg2l.c b/drivers/irqchip/irq-renesas-rzg2l.c
index 00688043697f0..5a7836186fd41 100644
--- a/drivers/irqchip/irq-renesas-rzg2l.c
+++ b/drivers/irqchip/irq-renesas-rzg2l.c
@@ -8,6 +8,7 @@
*/
#include <linux/bitfield.h>
+#include <linux/cleanup.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
@@ -408,12 +409,12 @@ static int rzg2l_irqc_parse_interrupts(struct rzg2l_irqc_priv *priv,
static int rzg2l_irqc_init(struct device_node *node, struct device_node *parent)
{
+ struct platform_device *pdev = of_find_device_by_node(node);
+ struct device *dev __free(put_device) = pdev ? &pdev->dev : NULL;
struct irq_domain *irq_domain, *parent_domain;
- struct platform_device *pdev;
struct reset_control *resetn;
int ret;
- pdev = of_find_device_by_node(node);
if (!pdev)
return -ENODEV;
@@ -467,6 +468,17 @@ static int rzg2l_irqc_init(struct device_node *node, struct device_node *parent)
register_syscore_ops(&rzg2l_irqc_syscore_ops);
+ /*
+ * Prevent the cleanup function from invoking put_device by assigning
+ * NULL to dev.
+ *
+ * make coccicheck will complain about missing put_device calls, but
+ * those are false positives, as dev will be automatically "put" via
+ * __free_put_device on the failing path.
+ * On the successful path we don't actually want to "put" dev.
+ */
+ dev = NULL;
+
return 0;
pm_put:
