1. Jun 02, 2014
  2. May 29, 2014
  3. May 28, 2014
    • Sujit Reddy Thumma's avatar
      scsi: ufs: Improve UFS fatal error handling · e8e7f271
      Sujit Reddy Thumma authored
      
      
      Error handling in UFS driver is broken and resets the host controller
      for fatal errors without re-initialization. Correct the fatal error
      handling sequence according to UFS Host Controller Interface (HCI)
      v1.1 specification.
      
      o Processed requests which are completed w/wo error are reported to
        SCSI layer and any pending commands that are not started are aborted
        in the controller and re-queued into scsi mid-layer queue.
      
      o Upon determining fatal error condition the host controller may hang
        forever until a reset is applied. Block SCSI layer for sending new
        requests and apply reset in a separate error handling work.
      
      o SCSI is informed about the expected Unit-Attention exception from the
        device for the immediate command after a reset so that the SCSI layer
        take necessary steps to establish communication with the device.
      
      Signed-off-by: default avatarSujit Reddy Thumma <sthumma@codeaurora.org>
      Reviewed-by: default avatarYaniv Gardi <ygardi@codeaurora.org>
      Tested-by: default avatarDolev Raviv <draviv@codeaurora.org>
      Acked-by: default avatarVinayak Holikatti <vinholikatti@gmail.com>
      Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
      e8e7f271