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SCSI_TRACK_QUEUE_FUL(9) SCSI mid layer SCSI_TRACK_QUEUE_FUL(9)

NAME

scsi_track_queue_full - track QUEUE_FULL events to adjust queue depth

SYNOPSIS

int scsi_track_queue_full(struct scsi_device * sdev, int depth);

ARGUMENTS

struct scsi_device * sdev
SCSI Device in question

int depth

Current number of outstanding SCSI commands on this device, not counting the one returned as QUEUE_FULL.

DESCRIPTION

This function will track successive QUEUE_FULL events on a specific SCSI device to determine if and when there is a need to adjust the queue depth on the device.

RETURN

0 - No change needed, >0 - Adjust queue depth to this new depth, -1 - Drop back to untagged operation using host->cmd_per_lun as the untagged command depth

Lock Status: None held on entry

NOTES

Low level drivers may call this at any time and we will do “The Right Thing.” We are interrupt context safe.

AUTHORS

James Bottomley <James.Bottomley@hansenpartnership.com>
Author.

Rob Landley <rob@landley.net>

Author.

COPYRIGHT

September 2017 Kernel Hackers Manual 4.12