ata_scmd_need_defer(9)

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 main

taining 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.

AUTHOR

Jeff Garzik

Author.

COPYRIGHT

ATA_SCMD_NEED_DEFER(9)