#ifndef CM9780_H_INCLUDED #define CM9780_H_INCLUDED #define CM9780_JACK 0x62 #define CM9780_MIXER 0x64 #define CM9780_GPIO_SETUP 0x70 #define CM9780_GPIO_STATUS 0x72 /* jack control */ #define CM9780_RSOE 0x0001 #define CM9780_CBOE 0x0002 #define CM9780_SSOE 0x0004 #define CM9780_FROE 0x0008 #define CM9780_HP2FMICOE 0x0010 #define CM9780_CB2MICOE 0x0020 #define CM9780_FMIC2LI 0x0040 #define CM9780_FMIC2MIC 0x0080 #define CM9780_HP2LI 0x0100 #define CM9780_HP2MIC 0x0200 #define CM9780_MIC2LI 0x0400 #define CM9780_MIC2MIC 0x0800 #define CM9780_LI2LI 0x1000 #define CM9780_LI2MIC 0x2000 #define CM9780_LO2LI 0x4000 #define CM9780_LO2MIC 0x8000 /* mixer control */ #define CM9780_BSTSEL 0x0001 #define CM9780_STRO_MIC 0x0002 #define CM9780_SPDI_FREX 0x0004 #define CM9780_SPDI_SSEX 0x0008 #define CM9780_SPDI_CBEX 0x0010 #define CM9780_SPDI_RSEX 0x0020 #define CM9780_MIX2FR 0x0040 #define CM9780_MIX2SS 0x0080 #define CM9780_MIX2CB 0x0100 #define CM9780_MIX2RS 0x0200 #define CM9780_MIX2FR_EX 0x0400 #define CM9780_MIX2SS_EX 0x0800 #define CM9780_MIX2CB_EX 0x1000 #define CM9780_MIX2RS_EX 0x2000 #define CM9780_P47_IO 0x4000 #define CM9780_PCBSW 0x8000 /* GPIO setup */ #define CM9780_GPI0EN 0x0001 #define CM9780_GPI1EN 0x0002 #define CM9780_SENSE_P 0x0004 #define CM9780_LOCK_P 0x0008 #define CM9780_GPIO0P 0x0010 #define CM9780_GPIO1P 0x0020 #define CM9780_GPIO0IO 0x0100 #define CM9780_GPIO1IO 0x0200 /* GPIO status */ #define CM9780_GPO0 0x0001 #define CM9780_GPO1 0x0002 #define CM9780_GPIO0S 0x0010 #define CM9780_GPIO1S 0x0020 #define CM9780_GPII0S 0x0100 #define CM9780_GPII1S 0x0200 #endif git/log/net/dsa/dsa2.c'>logtreecommitdiff
path: root/net/dsa/dsa2.c
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2017-02-11Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller-private-remove&id=966d2b04e070bc040319aaebfec09e0144dc3341'>quatech2.c
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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 /drivers/usb/serial/quatech2.c
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 'drivers/usb/serial/quatech2.c')