acp_hw_init() registers ACP child devices with mfd_add_devices() before
attaching them to the ACP power domain and initializing the hardware.
If attaching a child to the power domain fails, or if the ACP reset or
clock enable operation times out, the failure path frees only the
source cell, resource, and platform-data allocations. The child
platform devices already registered by mfd_add_devices() remain
registered and are never released.
Remove the children from the power domain and unregister the MFD
devices on failures that occur after mfd_add_devices() succeeds. Keep
mfd_add_devices() failures on the existing cleanup path since the MFD
core already rolls back partially registered children itself.
The issue was identified by a static analysis tool I developed and
confirmed by manual review.
Fixes: 25030321ba28 ("drm/amd: add pm domain for ACP IP sub blocks")
Cc: [email protected]
Signed-off-by: Guangshuo Li <[email protected]>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c
index 9014678d75ab..be4d00ac96b3 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c
@@ -318,7 +318,7 @@ static int acp_hw_init(struct amdgpu_ip_block *ip_block)
r = device_for_each_child(adev->acp.parent,
&adev->acp.acp_genpd->gpd,
acp_genpd_add_device);
if (r)
- goto failure;
+ goto failure_remove_mfd;
break;
}
default:
@@ -443,7 +443,7 @@ static int acp_hw_init(struct amdgpu_ip_block *ip_block)
r = device_for_each_child(adev->acp.parent,
&adev->acp.acp_genpd->gpd,
acp_genpd_add_device);
if (r)
- goto failure;
+ goto failure_remove_mfd;
}
/* Assert Soft reset of ACP */
@@ -461,7 +461,7 @@ static int acp_hw_init(struct amdgpu_ip_block *ip_block)
if (--count == 0) {
dev_err(&adev->pdev->dev, "Failed to reset ACP\n");
r = -ETIMEDOUT;
- goto failure;
+ goto failure_remove_mfd;
}
udelay(100);
}
@@ -479,7 +479,7 @@ static int acp_hw_init(struct amdgpu_ip_block *ip_block)
if (--count == 0) {
dev_err(&adev->pdev->dev, "Failed to reset ACP\n");
r = -ETIMEDOUT;
- goto failure;
+ goto failure_remove_mfd;
}
udelay(100);
}
@@ -489,6 +489,11 @@ static int acp_hw_init(struct amdgpu_ip_block *ip_block)
cgs_write_register(adev->acp.cgs_device, mmACP_SOFT_RESET, val);
return 0;
+failure_remove_mfd:
+ device_for_each_child(adev->acp.parent, NULL,
+ acp_genpd_remove_device);
+ mfd_remove_devices(adev->acp.parent);
+
failure:
kfree(adev->acp.i2s_pdata);
kfree(adev->acp.acp_res);
--
2.43.0
