arm64: configs: fine-tune USB drivers for imx93-charge-som-dc #11
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This enables CDC EEM/MBIM support and RNDIS as well. This is needed to make Android's USB tethering work which is a nice option in case of field support. While at, disable some rare drivers but enable known ones. Also disable special drivers for USB testing environments. Signed-off-by: Michael Heimpold <[email protected]>
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[ Upstream commit 88f7f56 ] When a bio with REQ_PREFLUSH is submitted to dm, __send_empty_flush() generates a flush_bio with REQ_OP_WRITE | REQ_PREFLUSH | REQ_SYNC, which causes the flush_bio to be throttled by wbt_wait(). An example from v5.4, similar problem also exists in upstream: crash> bt 2091206 PID: 2091206 TASK: ffff2050df92a300 CPU: 109 COMMAND: "kworker/u260:0" #0 [ffff800084a2f7f0] __switch_to at ffff80004008aeb8 #1 [ffff800084a2f820] __schedule at ffff800040bfa0c4 #2 [ffff800084a2f880] schedule at ffff800040bfa4b4 #3 [ffff800084a2f8a0] io_schedule at ffff800040bfa9c4 #4 [ffff800084a2f8c0] rq_qos_wait at ffff8000405925bc #5 [ffff800084a2f940] wbt_wait at ffff8000405bb3a0 #6 [ffff800084a2f9a0] __rq_qos_throttle at ffff800040592254 #7 [ffff800084a2f9c0] blk_mq_make_request at ffff80004057cf38 #8 [ffff800084a2fa60] generic_make_request at ffff800040570138 #9 [ffff800084a2fae0] submit_bio at ffff8000405703b4 #10 [ffff800084a2fb50] xlog_write_iclog at ffff800001280834 [xfs] #11 [ffff800084a2fbb0] xlog_sync at ffff800001280c3c [xfs] #12 [ffff800084a2fbf0] xlog_state_release_iclog at ffff800001280df4 [xfs] #13 [ffff800084a2fc10] xlog_write at ffff80000128203c [xfs] #14 [ffff800084a2fcd0] xlog_cil_push at ffff8000012846dc [xfs] #15 [ffff800084a2fda0] xlog_cil_push_work at ffff800001284a2c [xfs] #16 [ffff800084a2fdb0] process_one_work at ffff800040111d08 #17 [ffff800084a2fe00] worker_thread at ffff8000401121cc torvalds#18 [ffff800084a2fe70] kthread at ffff800040118de4 After commit 2def284 ("xfs: don't allow log IO to be throttled"), the metadata submitted by xlog_write_iclog() should not be throttled. But due to the existence of the dm layer, throttling flush_bio indirectly causes the metadata bio to be throttled. Fix this by conditionally adding REQ_IDLE to flush_bio.bi_opf, which makes wbt_should_throttle() return false to avoid wbt_wait(). Signed-off-by: Jinliang Zheng <[email protected]> Reviewed-by: Tianxiang Peng <[email protected]> Reviewed-by: Hao Peng <[email protected]> Signed-off-by: Mikulas Patocka <[email protected]> Signed-off-by: Sasha Levin <[email protected]>
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[ Upstream commit 46d22b4 ] queue->state_change is set as part of nvmet_tcp_set_queue_sock(), but if the TCP connection isn't established when nvmet_tcp_set_queue_sock() is called then queue->state_change isn't set and sock->sk->sk_state_change isn't replaced. As such we don't need to restore sock->sk->sk_state_change if queue->state_change is NULL. This avoids NULL pointer dereferences such as this: [ 286.462026][ C0] BUG: kernel NULL pointer dereference, address: 0000000000000000 [ 286.462814][ C0] #PF: supervisor instruction fetch in kernel mode [ 286.463796][ C0] #PF: error_code(0x0010) - not-present page [ 286.464392][ C0] PGD 8000000140620067 P4D 8000000140620067 PUD 114201067 PMD 0 [ 286.465086][ C0] Oops: Oops: 0010 [#1] SMP KASAN PTI [ 286.465559][ C0] CPU: 0 UID: 0 PID: 1628 Comm: nvme Not tainted 6.15.0-rc2+ #11 PREEMPT(voluntary) [ 286.466393][ C0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-3.fc41 04/01/2014 [ 286.467147][ C0] RIP: 0010:0x0 [ 286.467420][ C0] Code: Unable to access opcode bytes at 0xffffffffffffffd6. [ 286.467977][ C0] RSP: 0018:ffff8883ae008580 EFLAGS: 00010246 [ 286.468425][ C0] RAX: 0000000000000000 RBX: ffff88813fd34100 RCX: ffffffffa386cc43 [ 286.469019][ C0] RDX: 1ffff11027fa68b6 RSI: 0000000000000008 RDI: ffff88813fd34100 [ 286.469545][ C0] RBP: ffff88813fd34160 R08: 0000000000000000 R09: ffffed1027fa682c [ 286.470072][ C0] R10: ffff88813fd34167 R11: 0000000000000000 R12: ffff88813fd344c3 [ 286.470585][ C0] R13: ffff88813fd34112 R14: ffff88813fd34aec R15: ffff888132cdd268 [ 286.471070][ C0] FS: 00007fe3c04c7d80(0000) GS:ffff88840743f000(0000) knlGS:0000000000000000 [ 286.471644][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 286.472543][ C0] CR2: ffffffffffffffd6 CR3: 000000012daca000 CR4: 00000000000006f0 [ 286.473500][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 286.474467][ C0] DR3: 0000000000000000 DR6: 00000000ffff07f0 DR7: 0000000000000400 [ 286.475453][ C0] Call Trace: [ 286.476102][ C0] <IRQ> [ 286.476719][ C0] tcp_fin+0x2bb/0x440 [ 286.477429][ C0] tcp_data_queue+0x190f/0x4e60 [ 286.478174][ C0] ? __build_skb_around+0x234/0x330 [ 286.478940][ C0] ? rcu_is_watching+0x11/0xb0 [ 286.479659][ C0] ? __pfx_tcp_data_queue+0x10/0x10 [ 286.480431][ C0] ? tcp_try_undo_loss+0x640/0x6c0 [ 286.481196][ C0] ? seqcount_lockdep_reader_access.constprop.0+0x82/0x90 [ 286.482046][ C0] ? kvm_clock_get_cycles+0x14/0x30 [ 286.482769][ C0] ? ktime_get+0x66/0x150 [ 286.483433][ C0] ? rcu_is_watching+0x11/0xb0 [ 286.484146][ C0] tcp_rcv_established+0x6e4/0x2050 [ 286.484857][ C0] ? rcu_is_watching+0x11/0xb0 [ 286.485523][ C0] ? ipv4_dst_check+0x160/0x2b0 [ 286.486203][ C0] ? __pfx_tcp_rcv_established+0x10/0x10 [ 286.486917][ C0] ? lock_release+0x217/0x2c0 [ 286.487595][ C0] tcp_v4_do_rcv+0x4d6/0x9b0 [ 286.488279][ C0] tcp_v4_rcv+0x2af8/0x3e30 [ 286.488904][ C0] ? raw_local_deliver+0x51b/0xad0 [ 286.489551][ C0] ? rcu_is_watching+0x11/0xb0 [ 286.490198][ C0] ? __pfx_tcp_v4_rcv+0x10/0x10 [ 286.490813][ C0] ? __pfx_raw_local_deliver+0x10/0x10 [ 286.491487][ C0] ? __pfx_nf_confirm+0x10/0x10 [nf_conntrack] [ 286.492275][ C0] ? rcu_is_watching+0x11/0xb0 [ 286.492900][ C0] ip_protocol_deliver_rcu+0x8f/0x370 [ 286.493579][ C0] ip_local_deliver_finish+0x297/0x420 [ 286.494268][ C0] ip_local_deliver+0x168/0x430 [ 286.494867][ C0] ? __pfx_ip_local_deliver+0x10/0x10 [ 286.495498][ C0] ? __pfx_ip_local_deliver_finish+0x10/0x10 [ 286.496204][ C0] ? ip_rcv_finish_core+0x19a/0x1f20 [ 286.496806][ C0] ? lock_release+0x217/0x2c0 [ 286.497414][ C0] ip_rcv+0x455/0x6e0 [ 286.497945][ C0] ? __pfx_ip_rcv+0x10/0x10 [ 286.498550][ C0] ? rcu_is_watching+0x11/0xb0 [ 286.499137][ C0] ? __pfx_ip_rcv_finish+0x10/0x10 [ 286.499763][ C0] ? lock_release+0x217/0x2c0 [ 286.500327][ C0] ? dl_scaled_delta_exec+0xd1/0x2c0 [ 286.500922][ C0] ? __pfx_ip_rcv+0x10/0x10 [ 286.501480][ C0] __netif_receive_skb_one_core+0x166/0x1b0 [ 286.502173][ C0] ? __pfx___netif_receive_skb_one_core+0x10/0x10 [ 286.502903][ C0] ? lock_acquire+0x2b2/0x310 [ 286.503487][ C0] ? process_backlog+0x372/0x1350 [ 286.504087][ C0] ? lock_release+0x217/0x2c0 [ 286.504642][ C0] process_backlog+0x3b9/0x1350 [ 286.505214][ C0] ? process_backlog+0x372/0x1350 [ 286.505779][ C0] __napi_poll.constprop.0+0xa6/0x490 [ 286.506363][ C0] net_rx_action+0x92e/0xe10 [ 286.506889][ C0] ? __pfx_net_rx_action+0x10/0x10 [ 286.507437][ C0] ? timerqueue_add+0x1f0/0x320 [ 286.507977][ C0] ? sched_clock_cpu+0x68/0x540 [ 286.508492][ C0] ? lock_acquire+0x2b2/0x310 [ 286.509043][ C0] ? kvm_sched_clock_read+0xd/0x20 [ 286.509607][ C0] ? handle_softirqs+0x1aa/0x7d0 [ 286.510187][ C0] handle_softirqs+0x1f2/0x7d0 [ 286.510754][ C0] ? __pfx_handle_softirqs+0x10/0x10 [ 286.511348][ C0] ? irqtime_account_irq+0x181/0x290 [ 286.511937][ C0] ? __dev_queue_xmit+0x85d/0x3450 [ 286.512510][ C0] do_softirq.part.0+0x89/0xc0 [ 286.513100][ C0] </IRQ> [ 286.513548][ C0] <TASK> [ 286.513953][ C0] __local_bh_enable_ip+0x112/0x140 [ 286.514522][ C0] ? __dev_queue_xmit+0x85d/0x3450 [ 286.515072][ C0] __dev_queue_xmit+0x872/0x3450 [ 286.515619][ C0] ? nft_do_chain+0xe16/0x15b0 [nf_tables] [ 286.516252][ C0] ? __pfx___dev_queue_xmit+0x10/0x10 [ 286.516817][ C0] ? selinux_ip_postroute+0x43c/0xc50 [ 286.517433][ C0] ? __pfx_selinux_ip_postroute+0x10/0x10 [ 286.518061][ C0] ? rcu_is_watching+0x11/0xb0 [ 286.518606][ C0] ? ip_output+0x164/0x4a0 [ 286.519149][ C0] ? rcu_is_watching+0x11/0xb0 [ 286.519671][ C0] ? ip_finish_output2+0x17d5/0x1fb0 [ 286.520258][ C0] ip_finish_output2+0xb4b/0x1fb0 [ 286.520787][ C0] ? __pfx_ip_finish_output2+0x10/0x10 [ 286.521355][ C0] ? __ip_finish_output+0x15d/0x750 [ 286.521890][ C0] ip_output+0x164/0x4a0 [ 286.522372][ C0] ? __pfx_ip_output+0x10/0x10 [ 286.522872][ C0] ? rcu_is_watching+0x11/0xb0 [ 286.523402][ C0] ? _raw_spin_unlock_irqrestore+0x4c/0x60 [ 286.524031][ C0] ? __pfx_ip_finish_output+0x10/0x10 [ 286.524605][ C0] ? __ip_queue_xmit+0x999/0x2260 [ 286.525200][ C0] ? rcu_is_watching+0x11/0xb0 [ 286.525744][ C0] ? ipv4_dst_check+0x16a/0x2b0 [ 286.526279][ C0] ? lock_release+0x217/0x2c0 [ 286.526793][ C0] __ip_queue_xmit+0x1883/0x2260 [ 286.527324][ C0] ? __skb_clone+0x54c/0x730 [ 286.527827][ C0] __tcp_transmit_skb+0x209b/0x37a0 [ 286.528374][ C0] ? __pfx___tcp_transmit_skb+0x10/0x10 [ 286.528952][ C0] ? rcu_is_watching+0x11/0xb0 [ 286.529472][ C0] ? seqcount_lockdep_reader_access.constprop.0+0x82/0x90 [ 286.530152][ C0] ? trace_hardirqs_on+0x12/0x120 [ 286.530691][ C0] tcp_write_xmit+0xb81/0x88b0 [ 286.531224][ C0] ? mod_memcg_state+0x4d/0x60 [ 286.531736][ C0] ? rcu_is_watching+0x11/0xb0 [ 286.532253][ C0] __tcp_push_pending_frames+0x90/0x320 [ 286.532826][ C0] tcp_send_fin+0x141/0xb50 [ 286.533352][ C0] ? __pfx_tcp_send_fin+0x10/0x10 [ 286.533908][ C0] ? __local_bh_enable_ip+0xab/0x140 [ 286.534495][ C0] inet_shutdown+0x243/0x320 [ 286.535077][ C0] nvme_tcp_alloc_queue+0xb3b/0x2590 [nvme_tcp] [ 286.535709][ C0] ? do_raw_spin_lock+0x129/0x260 [ 286.536314][ C0] ? __pfx_nvme_tcp_alloc_queue+0x10/0x10 [nvme_tcp] [ 286.536996][ C0] ? do_raw_spin_unlock+0x54/0x1e0 [ 286.537550][ C0] ? _raw_spin_unlock+0x29/0x50 [ 286.538127][ C0] ? do_raw_spin_lock+0x129/0x260 [ 286.538664][ C0] ? __pfx_do_raw_spin_lock+0x10/0x10 [ 286.539249][ C0] ? nvme_tcp_alloc_admin_queue+0xd5/0x340 [nvme_tcp] [ 286.539892][ C0] ? __wake_up+0x40/0x60 [ 286.540392][ C0] nvme_tcp_alloc_admin_queue+0xd5/0x340 [nvme_tcp] [ 286.541047][ C0] ? rcu_is_watching+0x11/0xb0 [ 286.541589][ C0] nvme_tcp_setup_ctrl+0x8b/0x7a0 [nvme_tcp] [ 286.542254][ C0] ? _raw_spin_unlock_irqrestore+0x4c/0x60 [ 286.542887][ C0] ? __pfx_nvme_tcp_setup_ctrl+0x10/0x10 [nvme_tcp] [ 286.543568][ C0] ? trace_hardirqs_on+0x12/0x120 [ 286.544166][ C0] ? _raw_spin_unlock_irqrestore+0x35/0x60 [ 286.544792][ C0] ? nvme_change_ctrl_state+0x196/0x2e0 [nvme_core] [ 286.545477][ C0] nvme_tcp_create_ctrl+0x839/0xb90 [nvme_tcp] [ 286.546126][ C0] nvmf_dev_write+0x3db/0x7e0 [nvme_fabrics] [ 286.546775][ C0] ? rw_verify_area+0x69/0x520 [ 286.547334][ C0] vfs_write+0x218/0xe90 [ 286.547854][ C0] ? do_syscall_64+0x9f/0x190 [ 286.548408][ C0] ? trace_hardirqs_on_prepare+0xdb/0x120 [ 286.549037][ C0] ? syscall_exit_to_user_mode+0x93/0x280 [ 286.549659][ C0] ? __pfx_vfs_write+0x10/0x10 [ 286.550259][ C0] ? do_syscall_64+0x9f/0x190 [ 286.550840][ C0] ? syscall_exit_to_user_mode+0x8e/0x280 [ 286.551516][ C0] ? trace_hardirqs_on_prepare+0xdb/0x120 [ 286.552180][ C0] ? syscall_exit_to_user_mode+0x93/0x280 [ 286.552834][ C0] ? ksys_read+0xf5/0x1c0 [ 286.553386][ C0] ? __pfx_ksys_read+0x10/0x10 [ 286.553964][ C0] ksys_write+0xf5/0x1c0 [ 286.554499][ C0] ? __pfx_ksys_write+0x10/0x10 [ 286.555072][ C0] ? trace_hardirqs_on_prepare+0xdb/0x120 [ 286.555698][ C0] ? syscall_exit_to_user_mode+0x93/0x280 [ 286.556319][ C0] ? do_syscall_64+0x54/0x190 [ 286.556866][ C0] do_syscall_64+0x93/0x190 [ 286.557420][ C0] ? rcu_read_unlock+0x17/0x60 [ 286.557986][ C0] ? rcu_is_watching+0x11/0xb0 [ 286.558526][ C0] ? lock_release+0x217/0x2c0 [ 286.559087][ C0] ? rcu_is_watching+0x11/0xb0 [ 286.559659][ C0] ? count_memcg_events.constprop.0+0x4a/0x60 [ 286.560476][ C0] ? exc_page_fault+0x7a/0x110 [ 286.561064][ C0] ? rcu_is_watching+0x11/0xb0 [ 286.561647][ C0] ? lock_release+0x217/0x2c0 [ 286.562257][ C0] ? do_user_addr_fault+0x171/0xa00 [ 286.562839][ C0] ? do_user_addr_fault+0x4a2/0xa00 [ 286.563453][ C0] ? irqentry_exit_to_user_mode+0x84/0x270 [ 286.564112][ C0] ? rcu_is_watching+0x11/0xb0 [ 286.564677][ C0] ? irqentry_exit_to_user_mode+0x84/0x270 [ 286.565317][ C0] ? trace_hardirqs_on_prepare+0xdb/0x120 [ 286.565922][ C0] entry_SYSCALL_64_after_hwframe+0x76/0x7e [ 286.566542][ C0] RIP: 0033:0x7fe3c05e6504 [ 286.567102][ C0] Code: c7 00 16 00 00 00 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 80 3d c5 8b 10 00 00 74 13 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 55 48 89 e5 48 83 ec 20 48 89 [ 286.568931][ C0] RSP: 002b:00007fff76444f58 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 [ 286.569807][ C0] RAX: ffffffffffffffda RBX: 000000003b40d930 RCX: 00007fe3c05e6504 [ 286.570621][ C0] RDX: 00000000000000cf RSI: 000000003b40d930 RDI: 0000000000000003 [ 286.571443][ C0] RBP: 0000000000000003 R08: 00000000000000cf R09: 000000003b40d930 [ 286.572246][ C0] R10: 0000000000000000 R11: 0000000000000202 R12: 000000003b40cd60 [ 286.573069][ C0] R13: 00000000000000cf R14: 00007fe3c07417f8 R15: 00007fe3c073502e [ 286.573886][ C0] </TASK> Closes: https://lore.kernel.org/linux-nvme/5hdonndzoqa265oq3bj6iarwtfk5dewxxjtbjvn5uqnwclpwt6@a2n6w3taxxex/ Signed-off-by: Alistair Francis <[email protected]> Reviewed-by: Sagi Grimberg <[email protected]> Tested-by: Shin'ichiro Kawasaki <[email protected]> Signed-off-by: Christoph Hellwig <[email protected]> Signed-off-by: Sasha Levin <[email protected]>
lategoodbye
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Jul 7, 2025
…th() [ Upstream commit 39dfc97 ] KASAN reports a stack-out-of-bounds read in regs_get_kernel_stack_nth(). Call Trace: [ 97.283505] BUG: KASAN: stack-out-of-bounds in regs_get_kernel_stack_nth+0xa8/0xc8 [ 97.284677] Read of size 8 at addr ffff800089277c10 by task 1.sh/2550 [ 97.285732] [ 97.286067] CPU: 7 PID: 2550 Comm: 1.sh Not tainted 6.6.0+ #11 [ 97.287032] Hardware name: linux,dummy-virt (DT) [ 97.287815] Call trace: [ 97.288279] dump_backtrace+0xa0/0x128 [ 97.288946] show_stack+0x20/0x38 [ 97.289551] dump_stack_lvl+0x78/0xc8 [ 97.290203] print_address_description.constprop.0+0x84/0x3c8 [ 97.291159] print_report+0xb0/0x280 [ 97.291792] kasan_report+0x84/0xd0 [ 97.292421] __asan_load8+0x9c/0xc0 [ 97.293042] regs_get_kernel_stack_nth+0xa8/0xc8 [ 97.293835] process_fetch_insn+0x770/0xa30 [ 97.294562] kprobe_trace_func+0x254/0x3b0 [ 97.295271] kprobe_dispatcher+0x98/0xe0 [ 97.295955] kprobe_breakpoint_handler+0x1b0/0x210 [ 97.296774] call_break_hook+0xc4/0x100 [ 97.297451] brk_handler+0x24/0x78 [ 97.298073] do_debug_exception+0xac/0x178 [ 97.298785] el1_dbg+0x70/0x90 [ 97.299344] el1h_64_sync_handler+0xcc/0xe8 [ 97.300066] el1h_64_sync+0x78/0x80 [ 97.300699] kernel_clone+0x0/0x500 [ 97.301331] __arm64_sys_clone+0x70/0x90 [ 97.302084] invoke_syscall+0x68/0x198 [ 97.302746] el0_svc_common.constprop.0+0x11c/0x150 [ 97.303569] do_el0_svc+0x38/0x50 [ 97.304164] el0_svc+0x44/0x1d8 [ 97.304749] el0t_64_sync_handler+0x100/0x130 [ 97.305500] el0t_64_sync+0x188/0x190 [ 97.306151] [ 97.306475] The buggy address belongs to stack of task 1.sh/2550 [ 97.307461] and is located at offset 0 in frame: [ 97.308257] __se_sys_clone+0x0/0x138 [ 97.308910] [ 97.309241] This frame has 1 object: [ 97.309873] [48, 184) 'args' [ 97.309876] [ 97.310749] The buggy address belongs to the virtual mapping at [ 97.310749] [ffff800089270000, ffff800089279000) created by: [ 97.310749] dup_task_struct+0xc0/0x2e8 [ 97.313347] [ 97.313674] The buggy address belongs to the physical page: [ 97.314604] page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x14f69a [ 97.315885] flags: 0x15ffffe00000000(node=1|zone=2|lastcpupid=0xfffff) [ 97.316957] raw: 015ffffe00000000 0000000000000000 dead000000000122 0000000000000000 [ 97.318207] raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000 [ 97.319445] page dumped because: kasan: bad access detected [ 97.320371] [ 97.320694] Memory state around the buggy address: [ 97.321511] ffff800089277b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 97.322681] ffff800089277b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 97.323846] >ffff800089277c00: 00 00 f1 f1 f1 f1 f1 f1 00 00 00 00 00 00 00 00 [ 97.325023] ^ [ 97.325683] ffff800089277c80: 00 00 00 00 00 00 00 00 00 f3 f3 f3 f3 f3 f3 f3 [ 97.326856] ffff800089277d00: f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00 This issue seems to be related to the behavior of some gcc compilers and was also fixed on the s390 architecture before: commit d93a855 ("s390/ptrace: Avoid KASAN false positives in regs_get_kernel_stack_nth()") As described in that commit, regs_get_kernel_stack_nth() has confirmed that `addr` is on the stack, so reading the value at `*addr` should be allowed. Use READ_ONCE_NOCHECK() helper to silence the KASAN check for this case. Fixes: 0a8ea52 ("arm64: Add HAVE_REGS_AND_STACK_ACCESS_API feature") Signed-off-by: Tengda Wu <[email protected]> Link: https://lore.kernel.org/r/[email protected] [will: Use '*addr' as the argument to READ_ONCE_NOCHECK()] Signed-off-by: Will Deacon <[email protected]> Signed-off-by: Sasha Levin <[email protected]>
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This enables CDC EEM/MBIM support and RNDIS as well. This is needed to make Android's USB tethering work which is a nice option in case of field support.
While at, disable some rare drivers but enable known ones.
Also disable special drivers for USB testing environments.