Subject: FAILED: patch "[PATCH] drm/amdgpu: fix rmmio iounmap skipped on device removal" failed to apply to 6.6-stable tree
To: Chengjun.Yao@amd.com,alexander.deucher@amd.com,asad.kamal@amd.com
Cc: <stable@vger.kernel.org>
From: <gregkh@linuxfoundation.org>
Date: Tue, 22 Sep 2026 17:03:42 +0200
Message-ID: <2026092242-mantis-dragonfly-bdca@gregkh>
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The patch below does not apply to the 6.6-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y
git checkout FETCH_HEAD
git cherry-pick -x 5155002b03b24ba3ef91c5c313b8cf0171b24904
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2026092242-mantis-dragonfly-bdca@gregkh' --subject-prefix 'PATCH 6.6.y' 'HEAD^..'

Possible dependencies:


thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 5155002b03b24ba3ef91c5c313b8cf0171b24904 Mon Sep 17 00:00:00 2001
From: Chengjun Yao <Chengjun.Yao@amd.com>
Date: Tue, 8 Sep 2026 10:15:43 +0800
Subject: [PATCH] drm/amdgpu: fix rmmio iounmap skipped on device removal

amdgpu_pci_remove() calls drm_dev_unplug() before fini_sw(), so
drm_dev_enter() is already false there and the iounmap() guarded by it
is skipped. This .remove path runs on both hot-unplug and plain rmmod,
so the register BAR ioremap mapping leaks one instance per unload.

Unmap rmmio unconditionally (guard only on non-NULL) and drop the now
unused idx.

Fixes: 62d5f9f7110a ("drm/amdgpu: Unmap MMIO mappings when device is not unplugged")
Signed-off-by: Chengjun Yao <Chengjun.Yao@amd.com>
Reviewed-by: Asad Kamal <asad.kamal@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit dd6f86a97260e5207d3329ad03aa89fdad61b1e6)
Cc: stable@vger.kernel.org

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 933804349dbf..9269e780feb7 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -4335,7 +4335,7 @@ void amdgpu_device_fini_hw(struct amdgpu_device *adev)
 
 void amdgpu_device_fini_sw(struct amdgpu_device *adev)
 {
-	int i, idx;
+	int i;
 	bool px;
 
 	amdgpu_device_ip_fini(adev);
@@ -4377,11 +4377,9 @@ void amdgpu_device_fini_sw(struct amdgpu_device *adev)
 	if ((adev->pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA)
 		vga_client_unregister(adev->pdev);
 
-	if (drm_dev_enter(adev_to_drm(adev), &idx)) {
-
+	if (adev->rmmio) {
 		iounmap(adev->rmmio);
 		adev->rmmio = NULL;
-		drm_dev_exit(idx);
 	}
 
 	if (IS_ENABLED(CONFIG_PERF_EVENTS))