1. 16 Nov, 2022 1 commit
    • Gerald Schaefer's avatar
      s390/dcssblk: fix deadlock when adding a DCSS · a41a11b4
      Gerald Schaefer authored
      After the rework from commit 1ebe2e5f ("block: remove
      GENHD_FL_EXT_DEVT"), when calling device_add_disk(), dcssblk will end up
      in disk_scan_partitions(), and not break out early w/o GENHD_FL_NO_PART.
      This will trigger implicit open/release via blkdev_get/put_whole()
      later. dcssblk_release() will then deadlock on dcssblk_devices_sem
      semaphore, which is already held from dcssblk_add_store() when calling
      device_add_disk().
      
      dcssblk does not support partitions (DCSSBLK_MINORS_PER_DISK == 1), and
      never scanned partitions before. Therefore restore the previous
      behavior, and explicitly disallow partition scanning by setting the
      GENHD_FL_NO_PART flag. This will also prevent this deadlock scenario.
      
      Fixes: 1ebe2e5f ("block: remove GENHD_FL_EXT_DEVT")
      Cc: <stable@vger.kernel.org> # 5.17+
      Signed-off-by: default avatarGerald Schaefer <gerald.schaefer@linux.ibm.com>
      Acked-by: default avatarHeiko Carstens <hca@linux.ibm.com>
      Signed-off-by: default avatarAlexander Gordeev <agordeev@linux.ibm.com>
      a41a11b4
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