Re: [PATCH 2/2] drm/amdgpu: add fw release for sdma v5_0

["Wang, Kevin(Yang)" <Kevin1.Wang@amd.com>]

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[AMD Official Use Only - Internal Distribution Only]

afte the API firmware_realease created, the api logic never changed. (the first commit by Linus)
and you can use below command to reference the api usage case in our drm driver.

$ grep -nR "release_firmware" -A 5 -B 5 drivers/gpu/drm/ | vim -

Best Regards,
Kevin
________________________________
From: Sheng, Wenhui <Wenhui.Sheng@amd.com>
Sent: Thursday, June 18, 2020 4:31 PM
To: Wang, Kevin(Yang) <Kevin1.Wang@amd.com>; amd-gfx@lists.freedesktop.org <amd-gfx@lists.freedesktop.org>
Subject: RE: [PATCH 2/2] drm/amdgpu: add fw release for sdma v5_0


[AMD Official Use Only - Internal Distribution Only]


[AMD Official Use Only - Internal Distribution Only]



Although we know that release_firmware has null check, but the code is not maintained by ourselves, so I think it’s much more safe to add null  check before invoke release_firmware.





Brs

Wenhui

From: Wang, Kevin(Yang) <Kevin1.Wang@amd.com>
Sent: Thursday, June 18, 2020 4:25 PM
To: Sheng, Wenhui <Wenhui.Sheng@amd.com>; amd-gfx@lists.freedesktop.org
Subject: Re: [PATCH 2/2] drm/amdgpu: add fw release for sdma v5_0



[AMD Official Use Only - Internal Distribution Only]







________________________________

From: amd-gfx <amd-gfx-bounces@lists.freedesktop.org<mailto:amd-gfx-bounces@lists.freedesktop.org>> on behalf of Wenhui Sheng <Wenhui.Sheng@amd.com<mailto:Wenhui.Sheng@amd.com>>
Sent: Thursday, June 18, 2020 3:53 PM
To: amd-gfx@lists.freedesktop.org<mailto:amd-gfx@lists.freedesktop.org> <amd-gfx@lists.freedesktop.org<mailto:amd-gfx@lists.freedesktop.org>>
Cc: Sheng, Wenhui <Wenhui.Sheng@amd.com<mailto:Wenhui.Sheng@amd.com>>
Subject: [PATCH 2/2] drm/amdgpu: add fw release for sdma v5_0



sdma v5_0 fw isn't released when module exit

Signed-off-by: Wenhui Sheng <Wenhui.Sheng@amd.com<mailto:Wenhui.Sheng@amd.com>>
---
 drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c b/drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c
index 58d2a80af450..6751ad69ed90 100644
--- a/drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c
@@ -1299,8 +1299,12 @@ static int sdma_v5_0_sw_fini(void *handle)
         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
         int i;

-       for (i = 0; i < adev->sdma.num_instances; i++)
+       for (i = 0; i < adev->sdma.num_instances; i++) {
+               if (adev->sdma.instance[i].fw != NULL)
+                       release_firmware(adev->sdma.instance[i].fw);

[kevin]:

the kernel api "release_firmware()" will check argument (is NULL pointer).

i think the patch don't need to double check it.

+
                 amdgpu_ring_fini(&adev->sdma.instance[i].ring);
+       }

         return 0;
 }
--
2.17.1

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