On Fri, Nov 25, 2016 at 04:54:06PM +0100, Takashi Iwai wrote: > When ASoC Intel SST Medfield driver is probed but without codec / card > assigned, it causes an Oops and freezes the kernel at suspend/resume, > > PM: Suspending system (freeze) > Suspending console(s) (use no_console_suspend to debug) > BUG: unable to handle kernel NULL pointer dereference at 0000000000000018 > IP: [<ffffffffc09d9409>] sst_soc_prepare+0x19/0xa0 [snd_soc_sst_mfld_platform] > Oops: 0000 [#1] PREEMPT SMP > CPU: 0 PID: 1552 Comm: systemd-sleep Tainted: G W 4.9.0-rc6-1.g5f5c2ad-default #1 > Call Trace: > [<ffffffffb45318f9>] dpm_prepare+0x209/0x460 > [<ffffffffb4531b61>] dpm_suspend_start+0x11/0x60 > [<ffffffffb40d3cc2>] suspend_devices_and_enter+0xb2/0x710 > [<ffffffffb40d462e>] pm_suspend+0x30e/0x390 > [<ffffffffb40d2eba>] state_store+0x8a/0x90 > [<ffffffffb43c670f>] kobj_attr_store+0xf/0x20 > [<ffffffffb42b0d97>] sysfs_kf_write+0x37/0x40 > [<ffffffffb42b02bc>] kernfs_fop_write+0x11c/0x1b0 > [<ffffffffb422be68>] __vfs_write+0x28/0x140 > [<ffffffffb43728a8>] ? apparmor_file_permission+0x18/0x20 > [<ffffffffb433b2ab>] ? security_file_permission+0x3b/0xc0 > [<ffffffffb422d095>] vfs_write+0xb5/0x1a0 > [<ffffffffb422e3d6>] SyS_write+0x46/0xa0 > [<ffffffffb4719fbb>] entry_SYSCALL_64_fastpath+0x1e/0xad > > Add proper NULL checks in the PM code of mdfld driver. Acked-by: Vinod Koul <vinod.koul@xxxxxxxxx> -- ~Vinod _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
