5.4-stable review patch. If anyone has any objections, please let me know.
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From: Sudeep Holla sudeep.holla@arm.com
[ Upstream commit 7458f72cc28f9eb0de811effcb5376d0ec19094a ]
If of_genpd_add_provider_onecell() fails during probe, the previously created generic power domains are not removed, leading to a memory leak and potential kernel crash later in genpd_debug_add().
Add proper error handling to unwind the initialized domains before returning from probe to ensure all resources are correctly released on failure.
Example crash trace observed without this fix:
| Unable to handle kernel paging request at virtual address fffffffffffffc70 | CPU: 1 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.18.0-rc1 #405 PREEMPT | Hardware name: ARM LTD ARM Juno Development Platform/ARM Juno Development Platform | pstate: 00000005 (nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) | pc : genpd_debug_add+0x2c/0x160 | lr : genpd_debug_init+0x74/0x98 | Call trace: | genpd_debug_add+0x2c/0x160 (P) | genpd_debug_init+0x74/0x98 | do_one_initcall+0xd0/0x2d8 | do_initcall_level+0xa0/0x140 | do_initcalls+0x60/0xa8 | do_basic_setup+0x28/0x40 | kernel_init_freeable+0xe8/0x170 | kernel_init+0x2c/0x140 | ret_from_fork+0x10/0x20
Fixes: 898216c97ed2 ("firmware: arm_scmi: add device power domain support using genpd") Signed-off-by: Sudeep Holla sudeep.holla@arm.com Reviewed-by: Peng Fan peng.fan@nxp.com Cc: stable@vger.kernel.org Signed-off-by: Ulf Hansson ulf.hansson@linaro.org [ drivers/pmdomain/arm/scmi_pm_domain.c -> drivers/firmware/arm_scmi/scmi_pm_domain.c ] Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/firmware/arm_scmi/scmi_pm_domain.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-)
--- a/drivers/firmware/arm_scmi/scmi_pm_domain.c +++ b/drivers/firmware/arm_scmi/scmi_pm_domain.c @@ -53,7 +53,7 @@ static int scmi_pd_power_off(struct gene
static int scmi_pm_domain_probe(struct scmi_device *sdev) { - int num_domains, i; + int num_domains, i, ret; struct device *dev = &sdev->dev; struct device_node *np = dev->of_node; struct scmi_pm_domain *scmi_pd; @@ -106,9 +106,18 @@ static int scmi_pm_domain_probe(struct s scmi_pd_data->domains = domains; scmi_pd_data->num_domains = num_domains;
+ ret = of_genpd_add_provider_onecell(np, scmi_pd_data); + if (ret) + goto err_rm_genpds; + dev_set_drvdata(dev, scmi_pd_data);
- return of_genpd_add_provider_onecell(np, scmi_pd_data); + return 0; +err_rm_genpds: + for (i = num_domains - 1; i >= 0; i--) + pm_genpd_remove(domains[i]); + + return ret; }
static void scmi_pm_domain_remove(struct scmi_device *sdev)