• Yi Zou's avatar
    [SCSI] libfc: Fix wrong scsi return status under FC_DATA_UNDRUN · 4347fa66
    Yi Zou authored
    
    
    This bug is exposed when there is a link flap in LLD. Particularly, when it
    happens right after a SCSI write command is sent out, no FCP_DATA is sent,
    causing fsp->status_code to be set as FC_DATA_UNDRUN in fc_fcp_complete_locked
    even no SCSI status is received. Consequently, fc_io_compl treats this as DID_OK.
    This results in SCSI returning successful to the initial I/O request even
    there is no DATA actually sent. Particularly, if you run an I/O tool w/ data
    verification on, the read back for verification is gonna fail.
    
    This is fixed here by checking when FC_DATA_UNDRUN happens, SCSI status is
    received w/ FC_SRB_RCV_STATUS set in fsp->state.
    Signed-off-by: default avatarYi Zou <yi.zou@intel.com>
    Signed-off-by: default avatarRobert Love <robert.w.love@intel.com>
    Signed-off-by: default avatarJames Bottomley <James.Bottomley@suse.de>
    4347fa66
fc_fcp.c 53.8 KB