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([2408:821b:3c17:2d0:8c54:276:fb3e:9667]) by smtp.gmail.com with ESMTPSA id v16sm6157644pje.1.2019.11.03.23.27.02 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 03 Nov 2019 23:27:12 -0800 (PST) In-Reply-To: <20190808160005.10325-6-hch@lst.de> To: hch@lst.de From: youling257 Subject: Re: ALSA: pcm: use dma_can_mmap() to check if a device supports dma_mmap_* Message-ID: <9e41aba3-c8ba-1d54-d693-fb822c58925f@gmail.com> Date: Mon, 4 Nov 2019 15:26:53 +0800 User-Agent: Mozilla/5.0 (X11; Linux i686; rv:68.0) Gecko/20100101 Thunderbird/68.2.1 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US X-Mailman-Approved-At: Tue, 05 Nov 2019 11:54:16 +1100 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-xtensa@linux-xtensa.org, monstr@monstr.eu, vladimir.murzin@arm.com, linux-parisc@vger.kernel.org, linux-sh@vger.kernel.org, tiwai@suse.de, deller@gmx.de, x86@kernel.org, linux-kernel@vger.kernel.org, gregkh@google.com, linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" This patch cause oops on android mainline kernel about gadget audio_source. Androidx86 run on android mainline kernel. [ 385.104963] android_work: sent uevent USB_STATE=CONNECTED [ 385.109006] android_work: sent uevent USB_STATE=DISCONNECTED [ 385.182024] android_work: sent uevent USB_STATE=CONNECTED [ 385.184737] configfs-gadget gadget: high-speed config #1: b [ 385.184921] android_work: sent uevent USB_STATE=CONFIGURED [ 385.285268] BUG: kernel NULL pointer dereference, address: 0000000000000220 [ 385.285339] #PF: supervisor read access in kernel mode [ 385.285374] #PF: error_code(0x0000) - not-present page [ 385.285436] PGD 80000000791e6067 P4D 80000000791e6067 PUD 0 [ 385.285473] Oops: 0000 [#1] PREEMPT SMP PTI [ 385.285509] CPU: 0 PID: 5780 Comm: Binder:1383_5 Tainted: G O 5.4.0-rc6-android-x86_64+ #1 [ 385.285571] Hardware name: Insyde ONDA Tablet/ONDA Tablet, BIOS ONDA.D890HBBNR0A 03/11/2015 [ 385.285639] RIP: 0010:dma_can_mmap+0x5/0x30 [ 385.285675] Code: 74 11 e9 ae 98 b2 00 48 8b 05 9f 40 94 01 48 85 c0 75 e3 31 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 0f 1f 44 00 00 <48> 8b 87 20 02 00 00 48 85 c0 74 09 48 83 78 10 00 0f 95 c0 c3 48 [ 385.285762] RSP: 0018:ffffb39443b63b78 EFLAGS: 00010246 [ 385.285797] RAX: 0000000000000001 RBX: ffffa28b91756600 RCX: 0000000000000040 [ 385.285857] RDX: ffffffffb62b2a00 RSI: 0000000000000000 RDI: 0000000000000000 [ 385.285917] RBP: ffffa28bac69f800 R08: ffffffffb63141b0 R09: ffffa28bf9a34a88 [ 385.285952] R10: ffffffffb62b2be0 R11: ffffffffb62b2bd0 R12: 0000000000000008 [ 385.286013] R13: 0000000000000000 R14: ffffa28bacd736a8 R15: ffffa28bacd736c8 [ 385.286076] FS: 0000000000000000(0000) GS:ffffa28bfb600000(0063) knlGS:00000000f5d81970 [ 385.286110] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 385.286171] CR2: 0000000000000220 CR3: 000000007b2f6000 CR4: 00000000001006f0 [ 385.286232] Call Trace: [ 385.286275] snd_pcm_hw_constraints_complete+0x3e/0x1f0 [ 385.286314] snd_pcm_open_substream+0x94/0x140 [ 385.286377] snd_pcm_open+0xf0/0x240 [ 385.286416] ? wake_up_q+0x60/0x60 [ 385.286460] snd_pcm_playback_open+0x3d/0x60 [ 385.286533] chrdev_open+0xa2/0x1c0 [ 385.286574] ? cdev_put.part.0+0x20/0x20 [ 385.286615] do_dentry_open+0x13a/0x380 [ 385.286686] path_openat+0x588/0x15d0 [ 385.286728] do_filp_open+0x91/0x100 [ 385.286769] ? __check_object_size+0x136/0x147 [ 385.286840] do_sys_open+0x184/0x280 [ 385.286880] ? handle_mm_fault+0xd7/0x1c0 [ 385.286920] do_fast_syscall_32+0x8e/0x250 [ 385.286992] entry_SYSENTER_compat+0x7c/0x8e [ 385.287302] CR2: 0000000000000220 [ 385.287391] ---[ end trace 73ffcefcbbe2b9a0 ]--- [ 385.296269] RIP: 0010:dma_can_mmap+0x5/0x30 [ 385.296337] Code: 74 11 e9 ae 98 b2 00 48 8b 05 9f 40 94 01 48 85 c0 75 e3 31 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 0f 1f 44 00 00 <48> 8b 87 20 02 00 00 48 85 c0 74 09 48 83 78 10 00 0f 95 c0 c3 48 [ 385.296407] RSP: 0018:ffffb39443b63b78 EFLAGS: 00010246 [ 385.296477] RAX: 0000000000000001 RBX: ffffa28b91756600 RCX: 0000000000000040 [ 385.296516] RDX: ffffffffb62b2a00 RSI: 0000000000000000 RDI: 0000000000000000 [ 385.296584] RBP: ffffa28bac69f800 R08: ffffffffb63141b0 R09: ffffa28bf9a34a88 [ 385.296654] R10: ffffffffb62b2be0 R11: ffffffffb62b2bd0 R12: 0000000000000008 [ 385.296693] R13: 0000000000000000 R14: ffffa28bacd736a8 R15: ffffa28bacd736c8 [ 385.296761] FS: 0000000000000000(0000) GS:ffffa28bfb600000(0063) knlGS:00000000f5d81970 [ 385.296830] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 385.296867] CR2: 0000000000000220 CR3: 000000007b2f6000 CR4: 00000000001006f0 [ 385.296936] Kernel panic - not syncing: Fatal exception [ 385.296985] Kernel Offset: 0x33e00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 385.305185] Rebooting in 5 seconds.. Revert it no the oops.