cd6181ff7e
After enabling CONFIG_DMA_API_DEBUG there was a warning about using dma_unmap_single() in wrong direction from ath11k_dp_rx_process_mon_status(). [ 140.279477] ------------[ cut here ]------------ [ 140.279908] DMA-API: ath11k_pci 0000:06:00.0: device driver syncs DMA memory with different direction [device address=0x00000000fac08a40] [size=2176 bytes] [mapped with DMA_FROM_DEVICE] [s [ 140.279925] WARNING: CPU: 7 PID: 97 at kernel/dma/debug.c:1120 check_sync+0x494/0x730 [ 140.279939] Modules linked in: ath11k_pci ath11k mac80211 libarc4 cfg80211 qmi_helpers qrtr_mhi mhi qrtr ns nvme nvme_core [ 140.279958] CPU: 7 PID: 97 Comm: kworker/u16:1 Not tainted 5.10.0-rc4+ #262 [ 140.279968] Hardware name: Intel(R) Client Systems NUC8i7HVK/NUC8i7HVB, BIOS HNKBLi70.86A.0049.2018.0801.1601 08/01/2018 [ 140.279995] Workqueue: phy0 ieee80211_scan_work [mac80211] [ 140.280009] RIP: 0010:check_sync+0x494/0x730 [ 140.280022] Code: 8b 4c 24 10 4c 8b 44 24 18 4c 8b 54 24 20 48 89 c6 4c 89 54 24 10 4c 89 f9 4c 89 ea 48 c7 c7 40 b9 74 9c 41 56 e8 2f a0 ab 00 <0f> 0b 48 89 ef e8 e5 17 ac 00 41 58 4c 8b [ 140.280033] RSP: 0018:ffff9f588024cbd8 EFLAGS: 00010086 [ 140.280046] RAX: 0000000000000000 RBX: ffff9f588024cc40 RCX: ffff8eed18dd9f98 [ 140.280057] RDX: 00000000ffffffd8 RSI: 0000000000000027 RDI: ffff8eed18dd9f90 [ 140.280067] RBP: ffff8eebc1407800 R08: 00000000ffffffea R09: 0000000000000000 [ 140.280082] R10: 0000000000000003 R11: 3fffffffffffffff R12: ffffffff9e081060 [ 140.280093] R13: ffff8eebc43908b0 R14: ffffffff9c74c104 R15: 00000000fac08a40 [ 140.280104] FS: 0000000000000000(0000) GS:ffff8eed18c00000(0000) knlGS:0000000000000000 [ 140.280115] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 140.280127] CR2: 00007f6feafb12a0 CR3: 00000001604ca001 CR4: 00000000003706e0 [ 140.280138] Call Trace: [ 140.280149] <IRQ> [ 140.280161] debug_dma_sync_single_for_cpu+0x79/0x80 [ 140.280173] ? mark_held_locks+0x50/0x80 [ 140.280185] ? lockdep_hardirqs_on_prepare.part.0+0x65/0x130 [ 140.280197] ? __local_bh_enable_ip+0x6f/0xb0 [ 140.280215] ? ath11k_dp_rx_reap_mon_status_ring+0x202/0x340 [ath11k] [ 140.280231] ath11k_dp_rx_reap_mon_status_ring+0x22c/0x340 [ath11k] [ 140.280249] ? ath11k_dp_rx_process_mon_rings+0x1a0/0x1a0 [ath11k] [ 140.280265] ath11k_dp_rx_process_mon_status+0x83/0x3c0 [ath11k] [ 140.280278] ? __lock_acquire+0x3bd/0x6d0 [ 140.280296] ? ath11k_dp_rx_process_mon_rings+0x1a0/0x1a0 [ath11k] [ 140.280311] ? ath11k_dp_rx_process_mon_rings+0x1a0/0x1a0 [ath11k] [ 140.280326] ? ath11k_hw_mac_id_to_srng_id_qca6390+0x10/0x10 [ath11k] [ 140.280341] ? ath11k_dp_rx_process_mon_rings+0x4a/0x1a0 [ath11k] [ 140.280353] ? timer_fixup_init+0x30/0x30 [ 140.280367] ? ath11k_dp_rx_process_mon_rings+0x1a0/0x1a0 [ath11k] [ 140.280385] ath11k_dp_service_mon_ring+0x2b/0x50 [ath11k] [ 140.280400] ? ath11k_dp_rx_process_mon_rings+0x1a0/0x1a0 [ath11k] [ 140.280413] call_timer_fn+0xb1/0x2d0 [ 140.280426] __run_timers.part.0+0x205/0x2f0 [ 140.280439] run_timer_softirq+0x21/0x50 [ 140.280450] __do_softirq+0xc2/0x454 [ 140.280463] asm_call_irq_on_stack+0x12/0x20 [ 140.280476] </IRQ> [ 140.280488] do_softirq_own_stack+0x56/0x60 [ 140.280500] irq_exit_rcu+0x9a/0xd0 [ 140.280511] sysvec_apic_timer_interrupt+0x43/0xa0 [ 140.280526] asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 140.280540] RIP: 0010:_raw_spin_unlock_irqrestore+0x25/0x40 [ 140.280551] Code: 80 00 00 00 00 55 48 89 fd 48 83 c7 18 53 48 89 f3 48 8b 74 24 10 e8 ca 8f 4b ff 48 89 ef e8 22 dc 4b ff f6 c7 02 75 0c 53 9d <65> ff 0d 04 51 20 64 5b 5d c3 e8 9c 08 56 [ 140.280563] RSP: 0018:ffff9f58802e7878 EFLAGS: 00000246 [ 140.280578] RAX: 00000000000435ef RBX: 0000000000000246 RCX: 0000000000000040 [ 140.280592] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff9be13e84 [ 140.280603] RBP: ffff8eed18dde480 R08: 0000000000000001 R09: ffff8eebc2292760 [ 140.280614] R10: 0000000000000005 R11: ffff8eebc2292760 R12: 0000000000000000 [ 140.280625] R13: ffff9f58802e7900 R14: ffff8eed18dde480 R15: ffff8eed18dde480 [ 140.280637] ? _raw_spin_unlock_irqrestore+0x34/0x40 [ 140.280649] __mod_timer+0x274/0x400 [ 140.280661] ? wait_for_completion_timeout+0x76/0x110 [ 140.280675] schedule_timeout+0xa8/0x140 [ 140.280687] ? __next_timer_interrupt+0x100/0x100 [ 140.280698] wait_for_completion_timeout+0xa2/0x110 [ 140.280714] ath11k_start_scan+0x4c/0xf0 [ath11k] [ 140.280730] ath11k_mac_op_hw_scan+0x1e9/0x2c0 [ath11k] [ 140.280763] drv_hw_scan+0x79/0x260 [mac80211] [ 140.280789] __ieee80211_scan_completed+0x379/0x440 [mac80211] [ 140.280816] ieee80211_scan_work+0x12f/0x330 [mac80211] [ 140.280830] process_one_work+0x279/0x5b0 [ 140.280842] worker_thread+0x49/0x300 [ 140.280854] ? process_one_work+0x5b0/0x5b0 [ 140.280868] kthread+0x135/0x150 [ 140.280880] ? __kthread_bind_mask+0x60/0x60 [ 140.280891] ret_from_fork+0x22/0x30 [ 140.280903] irq event stamp: 275961 [ 140.280918] hardirqs last enabled at (275960): [<ffffffff9b270f1f>] __local_bh_enable_ip+0x6f/0xb0 [ 140.280931] hardirqs last disabled at (275961): [<ffffffff9be13ca3>] _raw_spin_lock_irqsave+0x63/0x80 [ 140.280946] softirqs last enabled at (275944): [<ffffffffc055288d>] ath11k_ce_send+0x14d/0x260 [ath11k] [ 140.280958] softirqs last disabled at (275953): [<ffffffff9c000f72>] asm_call_irq_on_stack+0x12/0x20 [ 140.280971] ---[ end trace 31cb94e18d401398 ]--- Tested-on: QCA6390 hw2.0 PCI WLAN.HST.1.0.1-01740-QCAHSTSWPLZ_V2_TO_X86-1 Signed-off-by: Kalle Valo <kvalo@codeaurora.org> Link: https://lore.kernel.org/r/1606156046-24764-1-git-send-email-kvalo@codeaurora.org
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.