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firewire: Add more documentation to firewire-cdev.h

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Signed-off-by: Jay Fenlason <fenlason@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Jay Fenlason 2008-10-01 18:13:20 -04:00 committed by Stefan Richter
parent 99692f71ee
commit be585c07dd
1 changed files with 7 additions and 2 deletions
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9
include/linux/firewire-cdev.h
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@ -154,8 +154,13 @@ struct fw_cdev_event_iso_interrupt {
* @request: Valid if @common.type == %FW_CDEV_EVENT_REQUEST
* @iso_interrupt: Valid if @common.type == %FW_CDEV_EVENT_ISO_INTERRUPT
*
* Convenience union for userspace use. Events could be read(2) into a char
* buffer and then cast to this union for further processing.
* Convenience union for userspace use. Events could be read(2) into an
* appropriately aligned char buffer and then cast to this union for further
* processing. Note that for a request, response or iso_interrupt event,
* the data[] or header[] may make the size of the full event larger than
* sizeof(union fw_cdev_event). Also note that if you attempt to read(2)
* an event into a buffer that is not large enough for it, the data that does
* not fit will be discarded so that the next read(2) will return a new event.
*/
union fw_cdev_event {
struct fw_cdev_event_common common;