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This issue was found and also debugged by Carl Lei <me@xecycle.info>.
If the device is not enabled, iblock/file will have not setup their
se_device to bdev/file mappings. If a user tries to config the unmap
settings at this time, we will then crash trying to access a NULL pointer
where the bdev/file should be.
This patch adds a check to make sure the device is configured before
we try to call the configure_unmap callout.
Fixes: 34bd1dcacf0d ("scsi: target: Detect UNMAP support post configuration")
Reported-by: Carl Lei <me@xecycle.info>
Signed-off-by: Mike Christie <michael.christie@oracle.com>
Link: https://lore.kernel.org/r/20240209215247.5213-1-michael.christie@oracle.com
Reviewed-by: Maurizio Lombardi <mlombard@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
4cbec7e89a