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[PATCH AUTOSEL 6.16] drm/amdkfd: fix p2p links bug in topology

by Sasha Levin

From: Eric Huang <jinhuieric.huang(a)amd.com> [ Upstream commit ce42a3b581a9db10765eb835840b04dbe7972135 ] When creating p2p links, KFD needs to check XGMI link with two conditions, hive_id and is_sharing_enabled, but it is missing to check is_sharing_enabled, so add it to fix the error. Signed-off-by: Eric Huang <jinhuieric.huang(a)amd.com> Acked-by: Alex Deucher <alexander.deucher(a)amd.com> Signed-off-by: Alex Deucher <alexander.deucher(a)amd.com> (cherry picked from commit 36cc7d13178d901982da7a122c883861d98da624) Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- LLM Generated explanations, may be completely bogus: Based on my comprehensive analysis involving multiple specialized investigations into the kernel code, security implications, regression risks, and architectural impact, here is my determination: ## **Backport Status: YES** This commit should absolutely be backported to stable kernel trees. ## Detailed Justification: ### **1. Critical Security Bug Fix** The commit fixes a **security boundary violation** in SRIOV virtualized environments where P2P links were incorrectly created between GPUs that should be isolated. Without this fix: - VMs could potentially access each other's GPU memory through incorrect P2P links - This violates fundamental virtualization isolation principles - Could lead to data exfiltration between tenants in cloud/multi-tenant environments ### **2. Simple and Contained Fix** The change is minimal - just adding one additional condition check: ```c && amdgpu_xgmi_get_is_sharing_enabled(dev->gpu->adev, new_dev->gpu->adev) ``` This is exactly the type of targeted, low-risk fix that stable kernels prefer. ### **3. Long-Standing Bug (3+ Years)** - Bug introduced: May 2022 (kernel 5.19) - Exploitable since: September 2024 (when partial XGMI hives became possible) - The bug has been present across multiple kernel versions that are still supported ### **4. No Regression Risk for Common Cases** - **Bare metal systems**: `amdgpu_xgmi_get_is_sharing_enabled()` always returns true, so behavior is unchanged - **Older GPUs**: Unaffected as they don't have XGMI support - Only affects SRIOV virtualized environments with partial hive configurations ### **5. Already Cherry-Picked** The commit message shows "(cherry picked from commit 36cc7d13178d901982da7a122c883861d98da624)", indicating it's already been identified for backporting by AMD developers. ### **6. Meets All Stable Criteria** ✅ **Fixes a real bug**: Security vulnerability in VM isolation ✅ **Small change**: One-line logic addition ✅ **Already upstream**: Merged in mainline kernel ✅ **No new features**: Pure bugfix ✅ **Minimal risk**: Well-understood, targeted fix ✅ **Important**: Security issue affecting cloud providers ### **7. Affects Production Systems** This impacts major deployments: - Cloud GPU providers (AWS, Azure, GCP) using SRIOV - Enterprise private clouds with GPU virtualization - HPC clusters with multi-tenant GPU sharing - Any environment using AMD MxGPU SR-IOV technology ### **8. CVSS Score: 7.9 (HIGH)** The security assessment indicates this warrants CVE assignment with a HIGH severity score due to the potential for cross-VM data access. ## Conclusion: This is a textbook example of what should be backported to stable kernels: a critical security fix that's small, well-contained, has minimal regression risk, and addresses a real vulnerability that has existed for years in production systems. The fix prevents a serious isolation breach in virtualized GPU environments while having zero impact on the common bare-metal use case. drivers/gpu/drm/amd/amdkfd/kfd_topology.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_topology.c b/drivers/gpu/drm/amd/amdkfd/kfd_topology.c index 4ec73f33535eb..720b20e842ba4 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_topology.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_topology.c @@ -1587,7 +1587,8 @@ static int kfd_dev_create_p2p_links(void) break; if (!dev->gpu || !dev->gpu->adev || (dev->gpu->kfd->hive_id && - dev->gpu->kfd->hive_id == new_dev->gpu->kfd->hive_id)) + dev->gpu->kfd->hive_id == new_dev->gpu->kfd->hive_id && + amdgpu_xgmi_get_is_sharing_enabled(dev->gpu->adev, new_dev->gpu->adev))) goto next; /* check if node(s) is/are peer accessible in one direction or bi-direction */ -- 2.51.0

3 months, 2 weeks

2
11
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[PATCH] cifs: Fix oops due to uninitialised variable

by David Howells

Fix smb3_init_transform_rq() to initialise buffer to NULL before calling netfs_alloc_folioq_buffer() as netfs assumes it can append to the buffer it is given. Setting it to NULL means it should start a fresh buffer, but the value is currently undefined. Fixes: a2906d3316fc ("cifs: Switch crypto buffer to use a folio_queue rather than an xarray") Signed-off-by: David Howells <dhowells(a)redhat.com> cc: Steve French <sfrench(a)samba.org> cc: Paulo Alcantara <pc(a)manguebit.org> cc: linux-cifs(a)vger.kernel.org cc: linux-fsdevel(a)vger.kernel.org --- fs/smb/client/smb2ops.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/smb/client/smb2ops.c b/fs/smb/client/smb2ops.c index ad8947434b71..cd0c9b5a35c3 100644 --- a/fs/smb/client/smb2ops.c +++ b/fs/smb/client/smb2ops.c @@ -4487,7 +4487,7 @@ smb3_init_transform_rq(struct TCP_Server_Info *server, int num_rqst, for (int i = 1; i < num_rqst; i++) { struct smb_rqst *old = &old_rq[i - 1]; struct smb_rqst *new = &new_rq[i]; - struct folio_queue *buffer; + struct folio_queue *buffer = NULL; size_t size = iov_iter_count(&old->rq_iter); orig_len += smb_rqst_len(server, old);

3 months, 2 weeks

4
3
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[PATCH] mm: memcontrol: fix memcg accounting during cpu hotplug

by Andrew Guerrero

A filesystem writeback performance issue was discovered by repeatedly running CPU hotplug operations while a process in a cgroup with memory and io controllers enabled wrote to an ext4 file in a loop. When a CPU is offlined, the memcg_hotplug_cpu_dead() callback function flushes per-cpu vmstats counters. However, instead of applying a per-cpu counter once to each cgroup in the heirarchy, the per-cpu counter is applied repeatedly just to the nested cgroup. Under certain conditions, the per-cpu NR_FILE_DIRTY counter is routinely positive during hotplug events and the dirty file count artifically inflates. Once the dirty file count grows past the dirty_freerun_ceiling(), balance_dirty_pages() starts a backgroup writeback each time a file page is marked dirty within the nested cgroup. This change fixes memcg_hotplug_cpu_dead() so that the per-cpu vmstats and vmevents counters are applied once to each cgroup in the heirarchy, similar to __mod_memcg_state() and __count_memcg_events(). Fixes: 42a300353577 ("mm: memcontrol: fix recursive statistics correctness & scalabilty") Signed-off-by: Andrew Guerrero <ajgja(a)amazon.com> Reviewed-by: Gunnar Kudrjavets <gunnarku(a)amazon.com> --- Hey all, This patch is intended for the 5.10 longterm release branch. It will not apply cleanly to mainline and is inadvertantly fixed by a larger series of changes in later release branches: a3d4c05a4474 ("mm: memcontrol: fix cpuhotplug statistics flushing"). In 5.15, the counter flushing code is completely removed. This may be another viable option here too, though it's a larger change. Thanks! --- mm/memcontrol.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 142b4d5e08fe..8e085a4f45b7 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -2394,7 +2394,7 @@ static int memcg_hotplug_cpu_dead(unsigned int cpu) x = this_cpu_xchg(memcg->vmstats_percpu->stat[i], 0); if (x) for (mi = memcg; mi; mi = parent_mem_cgroup(mi)) - atomic_long_add(x, &memcg->vmstats[i]); + atomic_long_add(x, &mi->vmstats[i]); if (i >= NR_VM_NODE_STAT_ITEMS) continue; @@ -2417,7 +2417,7 @@ static int memcg_hotplug_cpu_dead(unsigned int cpu) x = this_cpu_xchg(memcg->vmstats_percpu->events[i], 0); if (x) for (mi = memcg; mi; mi = parent_mem_cgroup(mi)) - atomic_long_add(x, &memcg->vmevents[i]); + atomic_long_add(x, &mi->vmevents[i]); } } base-commit: c30b4019ea89633d790f0bfcbb03234f0d006f87 -- 2.47.3

3 months, 2 weeks

3
5
0 0

[PATCH] media: mtk-mdp: Fix a reference leak in mtk_mdp_probe()

by Haoxiang Li

vpu_get_plat_device() increases the reference count of the returned platform device. Add platform_device_put() to prevent reference leak. Fixes: ee18fc7b0b95 ("media: mtk-mdp: handle vpu_wdt_reg_handler() errors during probe") Cc: stable(a)vger.kernel.org Signed-off-by: Haoxiang Li <haoxiang_li2024(a)163.com> --- drivers/media/platform/mediatek/mdp/mtk_mdp_core.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/media/platform/mediatek/mdp/mtk_mdp_core.c b/drivers/media/platform/mediatek/mdp/mtk_mdp_core.c index 80fdc6ff57e0..6aedb6033010 100644 --- a/drivers/media/platform/mediatek/mdp/mtk_mdp_core.c +++ b/drivers/media/platform/mediatek/mdp/mtk_mdp_core.c @@ -198,7 +198,7 @@ static int mtk_mdp_probe(struct platform_device *pdev) VPU_RST_MDP); if (ret) { dev_err(&pdev->dev, "Failed to register reset handler\n"); - goto err_m2m_register; + goto err_vpu_get_dev; } platform_set_drvdata(pdev, mdp); @@ -206,7 +206,7 @@ static int mtk_mdp_probe(struct platform_device *pdev) ret = vb2_dma_contig_set_max_seg_size(&pdev->dev, DMA_BIT_MASK(32)); if (ret) { dev_err(&pdev->dev, "Failed to set vb2 dma mag seg size\n"); - goto err_m2m_register; + goto err_vpu_get_dev; } pm_runtime_enable(dev); @@ -214,6 +214,9 @@ static int mtk_mdp_probe(struct platform_device *pdev) return 0; +err_vpu_get_dev: + platform_device_put(mdp->vpu_dev); + err_m2m_register: v4l2_device_unregister(&mdp->v4l2_dev); -- 2.25.1

3 months, 2 weeks

2
1
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I look forward to your response

by Mr. Peter Hosmeyer

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3 months, 2 weeks

1
0
0 0

[PATCH] binder: fix double-free in dbitmap

by Carlos Llamas

A process might fail to allocate a new bitmap when trying to expand its proc->dmap. In that case, dbitmap_grow() fails and frees the old bitmap via dbitmap_free(). However, the driver calls dbitmap_free() again when the same process terminates, leading to a double-free error: ================================================================== BUG: KASAN: double-free in binder_proc_dec_tmpref+0x2e0/0x55c Free of addr ffff00000b7c1420 by task kworker/9:1/209 CPU: 9 UID: 0 PID: 209 Comm: kworker/9:1 Not tainted 6.17.0-rc6-dirty #5 PREEMPT Hardware name: linux,dummy-virt (DT) Workqueue: events binder_deferred_func Call trace: kfree+0x164/0x31c binder_proc_dec_tmpref+0x2e0/0x55c binder_deferred_func+0xc24/0x1120 process_one_work+0x520/0xba4 [...] Allocated by task 448: __kmalloc_noprof+0x178/0x3c0 bitmap_zalloc+0x24/0x30 binder_open+0x14c/0xc10 [...] Freed by task 449: kfree+0x184/0x31c binder_inc_ref_for_node+0xb44/0xe44 binder_transaction+0x29b4/0x7fbc binder_thread_write+0x1708/0x442c binder_ioctl+0x1b50/0x2900 [...] ================================================================== Fix this issue by marking proc->map NULL in dbitmap_free(). Cc: stable(a)vger.kernel.org Fixes: 15d9da3f818c ("binder: use bitmap for faster descriptor lookup") Signed-off-by: Carlos Llamas <cmllamas(a)google.com> --- drivers/android/dbitmap.h | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/android/dbitmap.h b/drivers/android/dbitmap.h index 956f1bd087d1..c7299ce8b374 100644 --- a/drivers/android/dbitmap.h +++ b/drivers/android/dbitmap.h @@ -37,6 +37,7 @@ static inline void dbitmap_free(struct dbitmap *dmap) { dmap->nbits = 0; kfree(dmap->map); + dmap->map = NULL; } /* Returns the nbits that a dbitmap can shrink to, 0 if not possible. */ -- 2.51.0.384.g4c02a37b29-goog

3 months, 2 weeks

3
2
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[PATCH net v1 1/1] net: usb: asix: ax88772: drop phylink use in PM to avoid MDIO runtime PM wakeups

by Oleksij Rempel

Drop phylink_{suspend,resume}() from ax88772 PM callbacks. MDIO bus accesses have their own runtime-PM handling and will try to wake the device if it is suspended. Such wake attempts must not happen from PM callbacks while the device PM lock is held. Since phylink {sus|re}sume may trigger MDIO, it must not be called in PM context. No extra phylink PM handling is required for this driver: - .ndo_open/.ndo_stop control the phylink start/stop lifecycle. - ethtool/phylib entry points run in process context, not PM. - phylink MAC ops program the MAC on link changes after resume. Fixes: e0bffe3e6894 ("net: asix: ax88772: migrate to phylink") Reported-by: Hubert Wiśniewski <hubert.wisniewski.25632(a)gmail.com> Cc: stable(a)vger.kernel.org Signed-off-by: Oleksij Rempel <o.rempel(a)pengutronix.de> --- drivers/net/usb/asix_devices.c | 13 ------------- 1 file changed, 13 deletions(-) diff --git a/drivers/net/usb/asix_devices.c b/drivers/net/usb/asix_devices.c index 792ddda1ad49..1e8f7089f5e8 100644 --- a/drivers/net/usb/asix_devices.c +++ b/drivers/net/usb/asix_devices.c @@ -607,15 +607,8 @@ static const struct net_device_ops ax88772_netdev_ops = { static void ax88772_suspend(struct usbnet *dev) { - struct asix_common_private *priv = dev->driver_priv; u16 medium; - if (netif_running(dev->net)) { - rtnl_lock(); - phylink_suspend(priv->phylink, false); - rtnl_unlock(); - } - /* Stop MAC operation */ medium = asix_read_medium_status(dev, 1); medium &= ~AX_MEDIUM_RE; @@ -644,12 +637,6 @@ static void ax88772_resume(struct usbnet *dev) for (i = 0; i < 3; i++) if (!priv->reset(dev, 1)) break; - - if (netif_running(dev->net)) { - rtnl_lock(); - phylink_resume(priv->phylink); - rtnl_unlock(); - } } static int asix_resume(struct usb_interface *intf) -- 2.47.3

3 months, 2 weeks

8
20
0 0

[PATCH v11] Bluetooth: hci_qca: Fix SSR (SubSystem Restart) fail when BT_EN is pulled up by hw

by Shuai Zhang

When the host actively triggers SSR and collects coredump data, the Bluetooth stack sends a reset command to the controller. However, due to the inability to clear the QCA_SSR_TRIGGERED and QCA_IBS_DISABLED bits, the reset command times out. To address this, this patch clears the QCA_SSR_TRIGGERED and QCA_IBS_DISABLED flags and adds a 50ms delay after SSR, but only when HCI_QUIRK_NON_PERSISTENT_SETUP is not set. This ensures the controller completes the SSR process when BT_EN is always high due to hardware. For the purpose of HCI_QUIRK_NON_PERSISTENT_SETUP, please refer to the comment in `include/net/bluetooth/hci.h`. The HCI_QUIRK_NON_PERSISTENT_SETUP quirk is associated with BT_EN, and its presence can be used to determine whether BT_EN is defined in DTS. After SSR, host will not download the firmware, causing controller to remain in the IBS_WAKE state. Host needs to synchronize with the controller to maintain proper operation. Multiple triggers of SSR only first generate coredump file, due to memcoredump_flag no clear. add clear coredump flag when ssr completed. When the SSR duration exceeds 2 seconds, it triggers host tx_idle_timeout, which sets host TX state to sleep. due to the hardware pulling up bt_en, the firmware is not downloaded after the SSR. As a result, the controller does not enter sleep mode. Consequently, when the host sends a command afterward, it sends 0xFD to the controller, but the controller does not respond, leading to a command timeout. So reset tx_idle_timer after SSR to prevent host enter TX IBS_Sleep mode. --- Changs since v10: -- Update base patch to latest patch. Changs since v8-v9: -- Update base patch to latest patch. -- add Cc stable(a)vger.kernel.org on signed-of. Changes since v6-7: - Merge the changes into a single patch. - Update commit. Changes since v1-5: - Add an explanation for HCI_QUIRK_NON_PERSISTENT_SETUP. - Add commments for msleep(50). - Update format and commit. Signed-off-by: Shuai Zhang <quic_shuaz(a)quicinc.com> Cc: stable(a)vger.kernel.org --- drivers/bluetooth/hci_qca.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c index 4cff4d9be..2d6560482 100644 --- a/drivers/bluetooth/hci_qca.c +++ b/drivers/bluetooth/hci_qca.c @@ -1653,6 +1653,39 @@ static void qca_hw_error(struct hci_dev *hdev, u8 code) skb_queue_purge(&qca->rx_memdump_q); } + /* + * If the BT chip's bt_en pin is connected to a 3.3V power supply via + * hardware and always stays high, driver cannot control the bt_en pin. + * As a result, during SSR (SubSystem Restart), QCA_SSR_TRIGGERED and + * QCA_IBS_DISABLED flags cannot be cleared, which leads to a reset + * command timeout. + * Add an msleep delay to ensure controller completes the SSR process. + * + * Host will not download the firmware after SSR, controller to remain + * in the IBS_WAKE state, and the host needs to synchronize with it + * + * Since the bluetooth chip has been reset, clear the memdump state. + */ + if (!hci_test_quirk(hu->hdev, HCI_QUIRK_NON_PERSISTENT_SETUP)) { + /* + * When the SSR (SubSystem Restart) duration exceeds 2 seconds, + * it triggers host tx_idle_delay, which sets host TX state + * to sleep. Reset tx_idle_timer after SSR to prevent + * host enter TX IBS_Sleep mode. + */ + mod_timer(&qca->tx_idle_timer, jiffies + + msecs_to_jiffies(qca->tx_idle_delay)); + + /* Controller reset completion time is 50ms */ + msleep(50); + + clear_bit(QCA_SSR_TRIGGERED, &qca->flags); + clear_bit(QCA_IBS_DISABLED, &qca->flags); + + qca->tx_ibs_state = HCI_IBS_TX_AWAKE; + qca->memdump_state = QCA_MEMDUMP_IDLE; + } + clear_bit(QCA_HW_ERROR_EVENT, &qca->flags); } -- 2.34.1

3 months, 2 weeks

2
3
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[PATCH] mfd: rz-mtu3: fix MTU5 NFCR register offset

by Cosmin Tanislav

The NFCR register for MTU5 is at 0x1a95 offset according to Datasheet Page 725, Table 16.4. The address of all registers is offset by 0x1200, making the proper address of MTU5 NFCR register be 0x895. Cc: stable(a)vger.kernel.org Fixes: 654c293e1687 ("mfd: Add Renesas RZ/G2L MTU3a core driver") Signed-off-by: Cosmin Tanislav <cosmin-gabriel.tanislav.xa(a)renesas.com> --- drivers/mfd/rz-mtu3.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/mfd/rz-mtu3.c b/drivers/mfd/rz-mtu3.c index f3dac4a29a83..9cdfef610398 100644 --- a/drivers/mfd/rz-mtu3.c +++ b/drivers/mfd/rz-mtu3.c @@ -32,7 +32,7 @@ static const unsigned long rz_mtu3_8bit_ch_reg_offs[][13] = { [RZ_MTU3_CHAN_2] = MTU_8BIT_CH_1_2(0x204, 0x092, 0x205, 0x200, 0x20c, 0x201, 0x202), [RZ_MTU3_CHAN_3] = MTU_8BIT_CH_3_4_6_7(0x008, 0x093, 0x02c, 0x000, 0x04c, 0x002, 0x004, 0x005, 0x038), [RZ_MTU3_CHAN_4] = MTU_8BIT_CH_3_4_6_7(0x009, 0x094, 0x02d, 0x001, 0x04d, 0x003, 0x006, 0x007, 0x039), - [RZ_MTU3_CHAN_5] = MTU_8BIT_CH_5(0xab2, 0x1eb, 0xab4, 0xab6, 0xa84, 0xa85, 0xa86, 0xa94, 0xa95, 0xa96, 0xaa4, 0xaa5, 0xaa6), + [RZ_MTU3_CHAN_5] = MTU_8BIT_CH_5(0xab2, 0x895, 0xab4, 0xab6, 0xa84, 0xa85, 0xa86, 0xa94, 0xa95, 0xa96, 0xaa4, 0xaa5, 0xaa6), [RZ_MTU3_CHAN_6] = MTU_8BIT_CH_3_4_6_7(0x808, 0x893, 0x82c, 0x800, 0x84c, 0x802, 0x804, 0x805, 0x838), [RZ_MTU3_CHAN_7] = MTU_8BIT_CH_3_4_6_7(0x809, 0x894, 0x82d, 0x801, 0x84d, 0x803, 0x806, 0x807, 0x839), [RZ_MTU3_CHAN_8] = MTU_8BIT_CH_8(0x404, 0x098, 0x400, 0x406, 0x401, 0x402, 0x403) -- 2.51.0

3 months, 2 weeks

3
2
0 0

[PATCH] drm/amd: Only restore cached manual clock settings in restore if OD enabled

by Mario Limonciello

If OD is not enabled then restoring cached clock settings doesn't make sense and actually leads to errors in resume. Check if enabled before restoring settings. Fixes: 796ff8a7e01bd ("drm/amd: Restore cached manual clock settings during resume") Cc: stable(a)vger.kernel.org Reported-by: Jérôme Lécuyer <jerome.4a4c(a)gmail.com> Closes: https://lore.kernel.org/amd-gfx/0ffe2692-7bfa-4821-856e-dd0f18e2c32b@amd.co… Suggested-by: Jérôme Lécuyer <jerome.4a4c(a)gmail.com> Signed-off-by: Mario Limonciello <mario.limonciello(a)amd.com> --- drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c index bf2b38dd7e25..fb8086859857 100644 --- a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c +++ b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c @@ -2263,7 +2263,7 @@ static int smu_resume(struct amdgpu_ip_block *ip_block) return ret; } - if (smu_dpm_ctx->dpm_level == AMD_DPM_FORCED_LEVEL_MANUAL) { + if (smu_dpm_ctx->dpm_level == AMD_DPM_FORCED_LEVEL_MANUAL && smu->od_enabled) { ret = smu_od_edit_dpm_table(smu, PP_OD_COMMIT_DPM_TABLE, NULL, 0); if (ret) return ret; -- 2.49.0

3 months, 2 weeks

2
1
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