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path: root/include/drm/i2c/tda998x.h
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#ifndef __DRM_I2C_TDA998X_H__
#define __DRM_I2C_TDA998X_H__

#include <linux/hdmi.h>
#include <dt-bindings/display/tda998x.h>

enum {
	AFMT_UNUSED =	0,
	AFMT_SPDIF =	TDA998x_SPDIF,
	AFMT_I2S =	TDA998x_I2S,
};

struct tda998x_audio_params {
	u8 config;
	u8 format;
	unsigned sample_width;
	unsigned sample_rate;
	struct hdmi_audio_infoframe cea;
	u8 status[5];
};

struct tda998x_encoder_params {
	u8 swap_b:3;
	u8 mirr_b:1;
	u8 swap_a:3;
	u8 mirr_a:1;
	u8 swap_d:3;
	u8 mirr_d:1;
	u8 swap_c:3;
	u8 mirr_c:1;
	u8 swap_f:3;
	u8 mirr_f:1;
	u8 swap_e:3;
	u8 mirr_e:1;

	struct tda998x_audio_params audio_params;
};

#endif
uapi/sound/compress_params.h?id=966d2b04e070bc040319aaebfec09e0144dc3341'>include/uapi/sound/compress_params.h parent1b1bc42c1692e9b62756323c675a44cb1a1f9dbd (diff)
percpu-refcount: fix reference leak during percpu-atomic transition
percpu_ref_tryget() and percpu_ref_tryget_live() should return "true" IFF they acquire a reference. But the return value from atomic_long_inc_not_zero() is a long and may have high bits set, e.g. PERCPU_COUNT_BIAS, and the return value of the tryget routines is bool so the reference may actually be acquired but the routines return "false" which results in a reference leak since the caller assumes it does not need to do a corresponding percpu_ref_put(). This was seen when performing CPU hotplug during I/O, as hangs in blk_mq_freeze_queue_wait where percpu_ref_kill (blk_mq_freeze_queue_start) raced with percpu_ref_tryget (blk_mq_timeout_work). Sample stack trace: __switch_to+0x2c0/0x450 __schedule+0x2f8/0x970 schedule+0x48/0xc0 blk_mq_freeze_queue_wait+0x94/0x120 blk_mq_queue_reinit_work+0xb8/0x180 blk_mq_queue_reinit_prepare+0x84/0xa0 cpuhp_invoke_callback+0x17c/0x600 cpuhp_up_callbacks+0x58/0x150 _cpu_up+0xf0/0x1c0 do_cpu_up+0x120/0x150 cpu_subsys_online+0x64/0xe0 device_online+0xb4/0x120 online_store+0xb4/0xc0 dev_attr_store+0x68/0xa0 sysfs_kf_write+0x80/0xb0 kernfs_fop_write+0x17c/0x250 __vfs_write+0x6c/0x1e0 vfs_write+0xd0/0x270 SyS_write+0x6c/0x110 system_call+0x38/0xe0 Examination of the queue showed a single reference (no PERCPU_COUNT_BIAS, and __PERCPU_REF_DEAD, __PERCPU_REF_ATOMIC set) and no requests. However, conditions at the time of the race are count of PERCPU_COUNT_BIAS + 0 and __PERCPU_REF_DEAD and __PERCPU_REF_ATOMIC set. The fix is to make the tryget routines use an actual boolean internally instead of the atomic long result truncated to a int. Fixes: e625305b3907 percpu-refcount: make percpu_ref based on longs instead of ints Link: https://bugzilla.kernel.org/show_bug.cgi?id=190751 Signed-off-by: Douglas Miller <dougmill@linux.vnet.ibm.com> Reviewed-by: Jens Axboe <axboe@fb.com> Signed-off-by: Tejun Heo <tj@kernel.org> Fixes: e625305b3907 ("percpu-refcount: make percpu_ref based on longs instead of ints") Cc: stable@vger.kernel.org # v3.18+
Diffstat (limited to 'include/uapi/sound/compress_params.h')