ATA_STD_PRERESET(9) libata Library ATA_STD_PRERESET(9)NAME
ata_std_prereset - prepare for reset
SYNOPSIS
int ata_std_prereset(struct ata_link * link, unsigned long deadline);
ARGUMENTS
link
ATA link to be reset
deadline
deadline jiffies for the operation
DESCRIPTION
link is about to be reset. Initialize it. Failure from prereset makes libata abort whole reset sequence and give up that port, so prereset
should be best-effort. It does its best to prepare for reset sequence but if things go wrong, it should just whine, not fail.
LOCKING
Kernel thread context (may sleep)
RETURNS
0 on success, -errno otherwise.
AUTHOR
Jeff Garzik
Author.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 ATA_STD_PRERESET(9)
Check Out this Related Man Page
USB_QUEUE_RESET_DEVI(9) USB Core APIs USB_QUEUE_RESET_DEVI(9)NAME
usb_queue_reset_device - Reset a USB device from an atomic context
SYNOPSIS
void usb_queue_reset_device(struct usb_interface * iface);
ARGUMENTS
iface
USB interface belonging to the device to reset
DESCRIPTION
This function can be used to reset a USB device from an atomic context, where usb_reset_device won't work (as it blocks).
Doing a reset via this method is functionally equivalent to calling usb_reset_device, except for the fact that it is delayed to a
workqueue. This means that any drivers bound to other interfaces might be unbound, as well as users from usbfs in user space.
CORNER CASES
- Scheduling two resets at the same time from two different drivers attached to two different interfaces of the same device is possible;
depending on how the driver attached to each interface handles ->pre_reset, the second reset might happen or not.
- If a driver is unbound and it had a pending reset, the reset will be cancelled.
- This function can be called during .probe or .disconnect times. On return from .disconnect, any pending resets will be cancelled.
There is no no need to lock/unlock the reset_ws as schedule_work does its own.
NOTE
We don't do any reference count tracking because it is not needed. The lifecycle of the work_struct is tied to the usb_interface. Before
destroying the interface we cancel the work_struct, so the fact that work_struct is queued and or running means the interface (and thus,
the device) exist and are referenced.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 USB_QUEUE_RESET_DEVI(9)
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