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path: root/drivers/usb/chipidea/Kconfig
blob: 5e5b9eb7ebf6daa2f8a1764c60fe3dced6bee13f (plain)
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config USB_CHIPIDEA
	tristate "ChipIdea Highspeed Dual Role Controller"
	depends on ((USB_EHCI_HCD && USB_GADGET) || (USB_EHCI_HCD && !USB_GADGET) || (!USB_EHCI_HCD && USB_GADGET)) && HAS_DMA
	select EXTCON
	help
	  Say Y here if your system has a dual role high speed USB
	  controller based on ChipIdea silicon IP. It supports:
	  Dual-role switch (ID, OTG FSM, sysfs), Host-only, and
	  Peripheral-only.

	  When compiled dynamically, the module will be called ci-hdrc.ko.

if USB_CHIPIDEA

config USB_CHIPIDEA_OF
	tristate
	depends on OF
	default USB_CHIPIDEA

config USB_CHIPIDEA_PCI
	tristate
	depends on PCI
	depends on NOP_USB_XCEIV
	default USB_CHIPIDEA

config USB_CHIPIDEA_UDC
	bool "ChipIdea device controller"
	depends on USB_GADGET
	help
	  Say Y here to enable device controller functionality of the
	  ChipIdea driver.

config USB_CHIPIDEA_HOST
	bool "ChipIdea host controller"
	depends on USB_EHCI_HCD
	select USB_EHCI_ROOT_HUB_TT
	help
	  Say Y here to enable host controller functionality of the
	  ChipIdea driver.

endif
ef_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 'net/openvswitch/vport.c')