Name
ata_scmd_need_defer —
Check whether we need to defer scmd
Synopsis
int ata_scmd_need_defer (
struct ata_device * dev, int is_io)
;
Arguments
dev
ATA device to which the command is addressed
is_io
Is the command IO (and thus possibly NCQ)?
Description
NCQ and non-NCQ commands cannot run together. As upper layer
only knows the queue depth, we are responsible for maintaining
exclusion. This function checks whether a new command can be
issued to dev
.
LOCKING
spin_lock_irqsave(host_set lock)
RETURNS
1 if deferring is needed, 0 otherwise.