Hi,
A low level SCSI HBA driver can return the I/O back to
the OS from various paths.
Some of the common possible paths
1, enqueue_command itself
2. Timer handler (at the time of command timeout)
3. Interrupt handler (when a response is received from
the storage)
4. DPC handler thread.
Whenever an I/O is returned from the interrupt handler
by invoking scsi_done callback function, it will
invoke the SCSI mid layer.
1. Is it good practice to return call scsi_done
callback function from Interrupt handler?
If no, may I know the implications of doing that?
(other then blocking the interrupt context for a
longer time)
2. if multiple I/Os are returned in a single
interrupt, how many commands should be returned by
calling scsi_done before shifting to dpc thread?
Regards,
Parav Pandit
____________________________________________________________________________________
Got a little couch potato?
Check out fun summer activities for kids.
http://search.yahoo.com/search?fr=oni_on_mail&p=summer+activities+for+kids&cs=bz
-
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
