This is a note to let you know that I've just added the patch titled
cpuidle: riscv-sbi: fix device node release in early exit of for_each_possible_cpu
to the 6.12-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:
cpuidle-riscv-sbi-fix-device-node-release-in-early-e.patch
and it can be found in the queue-6.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 8d2693acca76bc059d9cb0c0e14498d1c4b38681
Author: Javier Carrasco <javier.carrasco.cruz@xxxxxxxxx>
Date: Sat Nov 16 00:32:39 2024 +0100
cpuidle: riscv-sbi: fix device node release in early exit of for_each_possible_cpu
[ Upstream commit 7e25044b804581b9c029d5a28d8800aebde18043 ]
The 'np' device_node is initialized via of_cpu_device_node_get(), which
requires explicit calls to of_node_put() when it is no longer required
to avoid leaking the resource.
Instead of adding the missing calls to of_node_put() in all execution
paths, use the cleanup attribute for 'np' by means of the __free()
macro, which automatically calls of_node_put() when the variable goes
out of scope. Given that 'np' is only used within the
for_each_possible_cpu(), reduce its scope to release the nood after
every iteration of the loop.
Fixes: 6abf32f1d9c5 ("cpuidle: Add RISC-V SBI CPU idle driver")
Reviewed-by: Andrew Jones <ajones@xxxxxxxxxxxxxxxx>
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@xxxxxxxxx>
Link: https://lore.kernel.org/r/20241116-cpuidle-riscv-sbi-cleanup-v3-1-a3a46372ce08@xxxxxxxxx
Signed-off-by: Palmer Dabbelt <palmer@xxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/cpuidle/cpuidle-riscv-sbi.c b/drivers/cpuidle/cpuidle-riscv-sbi.c
index d228b4d18d56..77a1fc668ae2 100644
--- a/drivers/cpuidle/cpuidle-riscv-sbi.c
+++ b/drivers/cpuidle/cpuidle-riscv-sbi.c
@@ -500,12 +500,12 @@ static int sbi_cpuidle_probe(struct platform_device *pdev)
int cpu, ret;
struct cpuidle_driver *drv;
struct cpuidle_device *dev;
- struct device_node *np, *pds_node;
+ struct device_node *pds_node;
/* Detect OSI support based on CPU DT nodes */
sbi_cpuidle_use_osi = true;
for_each_possible_cpu(cpu) {
- np = of_cpu_device_node_get(cpu);
+ struct device_node *np __free(device_node) = of_cpu_device_node_get(cpu);
if (np &&
of_property_present(np, "power-domains") &&
of_property_present(np, "power-domain-names")) {
