CDEV_ALLOC(9) Char devices CDEV_ALLOC(9)NAME
cdev_alloc - allocate a cdev structure
SYNOPSIS
struct cdev * cdev_alloc(void);
ARGUMENTS
void
no arguments
DESCRIPTION
Allocates and returns a cdev structure, or NULL on failure.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 CDEV_ALLOC(9)
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CCW_DEVICE_START_TIM(9) The ccw bus CCW_DEVICE_START_TIM(9)NAME
ccw_device_start_timeout - start a s390 channel program with timeout
SYNOPSIS
int ccw_device_start_timeout(struct ccw_device * cdev, struct ccw1 * cpa, unsigned long intparm, __u8 lpm, unsigned long flags,
int expires);
ARGUMENTS
cdev
target ccw device
cpa
logical start address of channel program
intparm
user specific interruption parameter; will be presented back to cdev's interrupt handler. Allows a device driver to associate the
interrupt with a particular I/O request.
lpm
defines the channel path to be used for a specific I/O request. A value of 0 will make cio use the opm.
flags
additional flags; defines the action to be performed for I/O processing.
expires
timeout value in jiffies
DESCRIPTION
Start a S/390 channel program. When the interrupt arrives, the IRQ handler is called, either immediately, delayed (dev-end missing, or
sense required) or never (no IRQ handler registered). This function notifies the device driver if the channel program has not completed
during the time specified by expires. If a timeout occurs, the channel program is terminated via xsch, hsch or csch, and the device's
interrupt handler will be called with an irb containing ERR_PTR(-ETIMEDOUT).
RETURNS
0, if the operation was successful; -EBUSY, if the device is busy, or status pending; -EACCES, if no path specified in lpm is operational;
-ENODEV, if the device is not operational.
CONTEXT
Interrupts disabled, ccw device lock held
AUTHOR
Cornelia Huck <cornelia.huck@de.ibm.com>
Author.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 CCW_DEVICE_START_TIM(9)