1 From 5a78ac33e3cb8822da64dd1af196e83664b332b0 Mon Sep 17 00:00:00 2001
2 From: Aditya Kumar Singh <quic_adisi@quicinc.com>
3 Date: Thu, 9 Mar 2023 15:23:08 +0530
4 Subject: [PATCH] wifi: ath11k: fix deinitialization of firmware resources
6 Currently, in ath11k_ahb_fw_resources_init(), iommu domain
7 mapping is done only for the chipsets having fixed firmware
8 memory. Also, for such chipsets, mapping is done only if it
9 does not have TrustZone support.
11 During deinitialization, only if TrustZone support is not there,
12 iommu is unmapped back. However, for non fixed firmware memory
13 chipsets, TrustZone support is not there and this makes the
14 condition check to true and it tries to unmap the memory which
15 was not mapped during initialization.
17 This leads to the following trace -
19 [ 83.198790] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000008
20 [ 83.259537] Modules linked in: ath11k_ahb ath11k qmi_helpers
22 [ 83.280286] pstate: 20000005 (nzCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
23 [ 83.287228] pc : __iommu_unmap+0x30/0x140
24 [ 83.293907] lr : iommu_unmap+0x5c/0xa4
25 [ 83.298072] sp : ffff80000b3abad0
27 [ 83.369175] Call trace:
28 [ 83.376282] __iommu_unmap+0x30/0x140
29 [ 83.378541] iommu_unmap+0x5c/0xa4
30 [ 83.382360] ath11k_ahb_fw_resource_deinit.part.12+0x2c/0xac [ath11k_ahb]
31 [ 83.385666] ath11k_ahb_free_resources+0x140/0x17c [ath11k_ahb]
32 [ 83.392521] ath11k_ahb_shutdown+0x34/0x40 [ath11k_ahb]
33 [ 83.398248] platform_shutdown+0x20/0x2c
34 [ 83.403455] device_shutdown+0x16c/0x1c4
35 [ 83.407621] kernel_restart_prepare+0x34/0x3c
36 [ 83.411529] kernel_restart+0x14/0x74
37 [ 83.415781] __do_sys_reboot+0x1c4/0x22c
38 [ 83.419427] __arm64_sys_reboot+0x1c/0x24
39 [ 83.423420] invoke_syscall+0x44/0xfc
40 [ 83.427326] el0_svc_common.constprop.3+0xac/0xe8
41 [ 83.430974] do_el0_svc+0xa0/0xa8
42 [ 83.435659] el0_svc+0x1c/0x44
43 [ 83.438957] el0t_64_sync_handler+0x60/0x144
44 [ 83.441910] el0t_64_sync+0x15c/0x160
45 [ 83.446343] Code: aa0103f4 f9400001 f90027a1 d2800001 (f94006a0)
46 [ 83.449903] ---[ end trace 0000000000000000 ]---
48 This can be reproduced by probing an AHB chipset which is not
49 having a fixed memory region. During reboot (or rmmod) trace
52 Fix this issue by adding a condition check on firmware fixed memory
53 hw_param as done in the counter initialization function.
55 Tested-on: IPQ8074 hw2.0 AHB WLAN.HK.2.7.0.1-01744-QCAHKSWPL_SILICONZ-1
57 Fixes: f9eec4947add ("ath11k: Add support for targets without trustzone")
58 Signed-off-by: Aditya Kumar Singh <quic_adisi@quicinc.com>
59 Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
60 Link: https://lore.kernel.org/r/20230309095308.24937-1-quic_adisi@quicinc.com
62 drivers/net/wireless/ath/ath11k/ahb.c | 6 ++++++
63 1 file changed, 6 insertions(+)
65 --- a/drivers/net/wireless/ath/ath11k/ahb.c
66 +++ b/drivers/net/wireless/ath/ath11k/ahb.c
67 @@ -1078,6 +1078,12 @@ static int ath11k_ahb_fw_resource_deinit
68 struct iommu_domain *iommu;
71 + /* Chipsets not requiring MSA would have not initialized
72 + * MSA resources, return success in such cases.
74 + if (!ab->hw_params.fixed_fw_mem)
77 if (ab_ahb->fw.use_tz)