hwlat_width_write

Name:hwlat_width_write - Write function for "width" entry*@filp: The active open file structure*@ubuf: The user buffer that contains the value to write*@cnt: The maximum number of bytes to write to "file"*@ppos: The current position in @file* This function

Proto:static ssize_t hwlat_width_write(struct file *filp, const char __user *ubuf, size_t cnt, loff_t *ppos)

Type:ssize_t

Parameter:

Type	Parameter	Name
struct file *	filp
const char __user *	ubuf
size_t	cnt
loff_t *	ppos

453

err = kstrtoull_from_user(ubuf, cnt, 10, & val)

454

If err Then Return err

457

mutex_lock( & protect changes )

458

If val < al sampling window (on+off) Then active sampling portion of window = val

460

Else err = -EINVAL

462

mutex_unlock - release the mutex*@lock: the mutex to be released* Unlock a mutex that has been locked by this task previously.* This function must not be used in interrupt context. Unlocking* of a not locked mutex is not allowed.

464

If err Then Return err

467

Return cnt

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