/* * tveeprom - Contains structures and functions to work with Hauppauge * eeproms. */ #include /** * enum tveeprom_audio_processor - Specifies the type of audio processor * used on a Hauppauge device. * * @TVEEPROM_AUDPROC_NONE: No audio processor present * @TVEEPROM_AUDPROC_INTERNAL: The audio processor is internal to the * video processor * @TVEEPROM_AUDPROC_MSP: The audio processor is a MSPXXXX device * @TVEEPROM_AUDPROC_OTHER: The audio processor is another device */ enum tveeprom_audio_processor { TVEEPROM_AUDPROC_NONE, TVEEPROM_AUDPROC_INTERNAL, TVEEPROM_AUDPROC_MSP, TVEEPROM_AUDPROC_OTHER, }; /** * struct tveeprom - Contains the fields parsed from Hauppauge eeproms * * @has_radio: 1 if the device has radio; 0 otherwise. * * @has_ir: If has_ir == 0, then it is unknown what the IR * capabilities are. Otherwise: * bit 0) 1 (= IR capabilities are known); * bit 1) IR receiver present; * bit 2) IR transmitter (blaster) present. * * @has_MAC_address: 0: no MAC, 1: MAC present, 2: unknown. * @tuner_type: type of the tuner (TUNER_*, as defined at * include/media/tuner.h). * * @tuner_formats: Supported analog TV standards (V4L2_STD_*). * @tuner_hauppauge_model: Hauppauge's code for the device model number. * @tuner2_type: type of the second tuner (TUNER_*, as defined * at include/media/tuner.h). * * @tuner2_formats: Tuner 2 supported analog TV standards * (V4L2_STD_*). * * @tuner2_hauppauge_model: tuner 2 Hauppauge's code for the device model * number. * * @audio_processor: analog audio decoder, as defined by enum * tveeprom_audio_processor. * * @decoder_processor: Hauppauge's code for the decoder chipset. * Unused by the drivers, as they probe the * decoder based on the PCI or USB ID. * * @model: Hauppauge's model number * * @revision: Card revision number * * @serial_number: Card's serial number * * @rev_str: Card revision converted to number * * @MAC_address: MAC address for the network interface */ struct tveeprom { u32 has_radio; u32 has_ir; u32 has_MAC_address; u32 tuner_type; u32 tuner_formats; u32 tuner_hauppauge_model; u32 tuner2_type; u32 tuner2_formats; u32 tuner2_hauppauge_model; u32 audio_processor; u32 decoder_processor; u32 model; u32 revision; u32 serial_number; char rev_str[5]; u8 MAC_address[ETH_ALEN]; }; /** * tveeprom_hauppauge_analog - Fill struct tveeprom using the contents * of the eeprom previously filled at * @eeprom_data field. * * @c: I2C client struct * @tvee: Struct to where the eeprom parsed data will be filled; * @eeprom_data: Array with the contents of the eeprom_data. It should * contain 256 bytes filled with the contents of the * eeprom read from the Hauppauge device. */ void tveeprom_hauppauge_analog(struct i2c_client *c, struct tveeprom *tvee, unsigned char *eeprom_data); /** * tveeprom_read - Reads the contents of the eeprom found at the Hauppauge * devices. * * @c: I2C client struct * @eedata: Array where the eeprom content will be stored. * @len: Size of @eedata array. If the eeprom content will be latter * be parsed by tveeprom_hauppauge_analog(), len should be, at * least, 256. */ int tveeprom_read(struct i2c_client *c, unsigned char *eedata, int len); form method='get'>
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authorDouglas Miller <dougmill@linux.vnet.ibm.com>2017-01-28 06:42:20 -0600
committerTejun Heo <tj@kernel.org>2017-01-28 07:49:42 -0500
commit966d2b04e070bc040319aaebfec09e0144dc3341 (patch)
tree4b96156e3d1dd4dfd6039b7c219c9dc4616da52d /tools/include/asm-generic/bitops
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 'tools/include/asm-generic/bitops')