Patch "drm/amd: check num of link levels when update pcie param" has been added to the 6.5-stable tree

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This is a note to let you know that I've just added the patch titled

    drm/amd: check num of link levels when update pcie param

to the 6.5-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-amd-check-num-of-link-levels-when-update-pcie-pa.patch
and it can be found in the queue-6.5 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 21727211ca951c8df3bc2bf63b0c6fd6b0208ac2
Author: Lin.Cao <lincao12@xxxxxxx>
Date:   Wed Oct 25 11:32:41 2023 +0800

    drm/amd: check num of link levels when update pcie param
    
    [ Upstream commit 406e8845356d18bdf3d3a23b347faf67706472ec ]
    
    In SR-IOV environment, the value of pcie_table->num_of_link_levels will
    be 0, and num_of_levels - 1 will cause array index out of bounds
    
    Signed-off-by: Lin.Cao <lincao12@xxxxxxx>
    Acked-by: Jingwen Chen <Jingwen.Chen2@xxxxxxx>
    Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0.c b/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0.c
index 223e890575a2b..3bc60ecc7bfef 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0.c
@@ -2436,6 +2436,9 @@ int smu_v13_0_update_pcie_parameters(struct smu_context *smu,
 	uint32_t smu_pcie_arg;
 	int ret, i;
 
+	if (!num_of_levels)
+		return 0;
+
 	if (!(smu->adev->pm.pp_feature & PP_PCIE_DPM_MASK)) {
 		if (pcie_table->pcie_gen[num_of_levels - 1] < pcie_gen_cap)
 			pcie_gen_cap = pcie_table->pcie_gen[num_of_levels - 1];



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