scsi: core: Make sure that targets outlive devices

This commit prevents that the following sequence triggers a kernel crash:

 - Deletion of a SCSI device is requested via sysfs. Device removal takes
   some time because blk_cleanup_queue() is waiting for the SCSI error
   handler.

 - The SCSI target associated with that SCSI device is removed.

 - scsi_remove_target() returns and its caller frees the resources
   associated with the SCSI target.

 - The error handler makes progress and invokes an LLD callback that
   dereferences the SCSI target pointer.

Link: https://lore.kernel.org/r/[email protected]
Cc: Christoph Hellwig <[email protected]>
Cc: Mike Christie <[email protected]>
Cc: Hannes Reinecke <[email protected]>
Cc: John Garry <[email protected]>
Cc: Li Zhijian <[email protected]>
Reported-by: Mike Christie <[email protected]>
Reviewed-by: Ming Lei <[email protected]>
Reviewed-by: Mike Christie <[email protected]>
Signed-off-by: Bart Van Assche <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

0 files changed, 0 insertions, 0 deletions