linux-kernel - [PATCH] drm/amd/pm: check return value of amdgpu_irq_add

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Message-Id: <20241001105727.1582368-1-Igor.A.Artemiev@mcst.ru>
Date: Tue,  1 Oct 2024 13:57:27 +0300
From: Igor Artemiev <Igor.A.Artemiev@...t.ru>
To: Alex Deucher <alexander.deucher@....com>
Cc: Igor Artemiev <Igor.A.Artemiev@...t.ru>,
        Christian König <christian.koenig@....com>,
        Xinhui Pan <Xinhui.Pan@....com>, David Airlie <airlied@...il.com>,
        Kenneth Feng <kenneth.feng@....com>, Simona Vetter <simona@...ll.ch>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, lvc-project@...uxtesting.org
Subject: [PATCH] drm/amd/pm: check return value of amdgpu_irq_add_id()

amdgpu_irq_ad_id() may fail and the irq handlers will not be registered.
This patch adds error code check.

Found by Linux Verification Center (linuxtesting.org) with static
analysis tool SVACE.

Signed-off-by: Igor Artemiev <Igor.A.Artemiev@...t.ru>
---
 .../drm/amd/pm/powerplay/hwmgr/smu_helper.c   | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu_helper.c b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu_helper.c
index 79a566f3564a..109df1039d5c 100644
--- a/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu_helper.c
+++ b/drivers/gpu/drm/amd/pm/powerplay/hwmgr/smu_helper.c
@@ -647,28 +647,41 @@ int smu9_register_irq_handlers(struct pp_hwmgr *hwmgr)
 {
 	struct amdgpu_irq_src *source =
 		kzalloc(sizeof(struct amdgpu_irq_src), GFP_KERNEL);
+	int ret;
 
 	if (!source)
 		return -ENOMEM;
 
 	source->funcs = &smu9_irq_funcs;
 
-	amdgpu_irq_add_id((struct amdgpu_device *)(hwmgr->adev),
+	ret = amdgpu_irq_add_id((struct amdgpu_device *)(hwmgr->adev),
 			SOC15_IH_CLIENTID_THM,
 			THM_9_0__SRCID__THM_DIG_THERM_L2H,
 			source);
-	amdgpu_irq_add_id((struct amdgpu_device *)(hwmgr->adev),
+	if (ret)
+		goto err;
+
+	ret = amdgpu_irq_add_id((struct amdgpu_device *)(hwmgr->adev),
 			SOC15_IH_CLIENTID_THM,
 			THM_9_0__SRCID__THM_DIG_THERM_H2L,
 			source);
+	if (ret)
+		goto err;
 
 	/* Register CTF(GPIO_19) interrupt */
-	amdgpu_irq_add_id((struct amdgpu_device *)(hwmgr->adev),
+	ret = amdgpu_irq_add_id((struct amdgpu_device *)(hwmgr->adev),
 			SOC15_IH_CLIENTID_ROM_SMUIO,
 			SMUIO_9_0__SRCID__SMUIO_GPIO19,
 			source);
+	if (ret)
+		goto err;
 
 	return 0;
+
+err:
+	kfree(source);
+
+	return ret;
 }
 
 void *smu_atom_get_data_table(void *dev, uint32_t table, uint16_t *size,
-- 
2.39.2