• Dan Williams's avatar
    [SCSI] libsas, libata: fix start of life for a sas ata_port · b2024459
    Dan Williams authored
    This changes the ordering of initialization and probing events from:
      1/ allocate rphy in PORTE_BYTES_DMAED, DISCE_REVALIDATE_DOMAIN
      2/ allocate ata_port and schedule port probe in DISCE_PROBE
    ...to:
      1/ allocate ata_port in PORTE_BYTES_DMAED, DISCE_REVALIDATE_DOMAIN
      2/ allocate rphy in PORTE_BYTES_DMAED, DISCE_REVALIDATE_DOMAIN
      3/ schedule port probe in DISCE_PROBE
    
    This ordering prevents PHYE_SIGNAL_LOSS_EVENTS from sneaking in to
    destrory ata devices before they have been fully initialized:
    
      BUG: unable to handle kernel paging request at 0000000000003b10
      IP: [<ffffffffa0053d7e>] sas_ata_end_eh+0x12/0x5e [libsas]
      ...
      [<ffffffffa004d1af>] sas_unregister_common_dev+0x78/0xc9 [libsas]
      [<ffffffffa004d4d4>] sas_unregister_dev+0x4f/0xad [libsas]
      [<ffffffffa004d5b1>] sas_unregister_domain_devices+0x7f/0xbf [libsas]
      [<ffffffffa004c487>] sas_deform_port+0x61/0x1b8 [libsas]
      [<ffffffffa004bed0>] sas_phye_loss_of_signal+0x29/0x2b [libsas]
    
    ...and kills the awkward "sata domain_device briefly existing in the
    domain without an ata_port" state.
    Reported-by: 's avatarMichal Kosciowski <michal.kosciowski@intel.com>
    Signed-off-by: 's avatarDan Williams <dan.j.williams@intel.com>
    Acked-by: 's avatarJeff Garzik <jgarzik@redhat.com>
    Signed-off-by: 's avatarJames Bottomley <JBottomley@Parallels.com>
    b2024459
sas_ata.h 2.39 KB