SCSI_TEST_UNIT_READY(9)                   SCSI mid layer                  SCSI_TEST_UNIT_READY(9)



NAME
       scsi_test_unit_ready - test if unit is ready

SYNOPSIS
       int scsi_test_unit_ready(struct scsi_device * sdev, int timeout, int retries,
                                struct scsi_sense_hdr * sshdr_external);

ARGUMENTS
       sdev
           scsi device to change the state of.

       timeout
           command timeout

       retries
           number of retries before failing

       sshdr_external
           Optional pointer to struct scsi_sense_hdr for returning sense. Make sure that this is
           cleared before passing in.

DESCRIPTION
       Returns zero if unsuccessful or an error if TUR failed. For removable media,
       UNIT_ATTENTION sets ->changed flag.

AUTHORS
       James Bottomley <James.Bottomley AT hansenpartnership.com>
           Author.

       Rob Landley <rob AT landley.net>
           Author.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                   SCSI_TEST_UNIT_READY(9)