1ATA_STD_QC_DEFER(9)             libata Library             ATA_STD_QC_DEFER(9)
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NAME

6       ata_std_qc_defer - Check whether a qc needs to be deferred
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SYNOPSIS

9       int ata_std_qc_defer(struct ata_queued_cmd * qc);
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ARGUMENTS

12       qc
13           ATA command in question
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DESCRIPTION

16       Non-NCQ commands cannot run with any other command, NCQ or not. As
17       upper layer only knows the queue depth, we are responsible for
18       maintaining exclusion. This function checks whether a new command qc
19       can be issued.
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LOCKING

22       spin_lock_irqsave(host lock)
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RETURNS

25       ATA_DEFER_* if deferring is needed, 0 otherwise.
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AUTHOR

28       Jeff Garzik
29           Author.
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32Kernel Hackers Manual 3.10         June 2019               ATA_STD_QC_DEFER(9)
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