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[SCSI] aha152x: preliminary fixes and some comments 

hunk by hunk:
  - CHECK_CONDITION is what happens to cmnd->status >> 1
    or after status_byte() macro. But here it is used
    directly on status which means 0x1 which is an undefined
    bit in the standard. And is a status that will never
    return from a target.

  - in busfree_run at the DONE_SC phase we have 3 distinct
    operation:
	1-if(DONE_SC->SCp.phase & check_condition)
          The REQUEST_SENSE command return.
          - Restore original command
	  - Than continue to operation 3.
	2-if(DONE_SC->SCp.Status==SAM_STAT_CHECK_CONDITION)
          A regular command returned with a status.
	  - Internally re-Q a REQUEST_SENSE.
	  - Do not do operation 3.
	3-
	  - Complete the command and return it to scsi-ml
     So the 0x2 in both these operations (1,2) means the scsi
     check-condition status, hence SAM_STAT_CHECK_CONDITION

  - Here the code asks about !(DONE_SC->SCp.Status & not_issued)
    but "not_issued" is an enum belonging to the "phase" member
    and not to the Status returned from target. The reason this
    works is because not_issued==1 and Also CHECK_CONDITION==1
    (remember from hunk 1). So actually the code was asking
    !(DONE_SC->SCp.Status & CHECK_CONDITION). Which means
    "Has the status been read from target yet?"
    Staus is read at status_run(). "not_issued" is
    cleared in seldo_run() which is usually earlier than
    status_run().

  So this patch does nothing as far as assembly is concerned
  but it does let the reader understand what is going on.

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Boaz Harrosh 2007-07-29 22:22:04 +03:00 committed by James Bottomley
parent b1ee079527
commit 0ceb47987d
1 changed files with 4 additions and 4 deletions
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8
drivers/scsi/aha152x.c
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@ -986,7 +986,7 @@ static int aha152x_internal_queue(Scsi_Cmnd *SCpnt, struct completion *complete,
SCpnt->scsi_done = done;
SCpnt->resid = SCpnt->request_bufflen;
SCpnt->SCp.phase = not_issued | phase;
SCpnt->SCp.Status = CHECK_CONDITION;
SCpnt->SCp.Status = 0x1; /* Ilegal status by SCSI standard */
SCpnt->SCp.Message = 0;
SCpnt->SCp.have_data_in = 0;
SCpnt->SCp.sent_command = 0;
@ -1574,12 +1574,12 @@ static void busfree_run(struct Scsi_Host *shpnt)
cmd->use_sg = sc->use_sg;
cmd->cmd_len = sc->cmd_len;
cmd->SCp.Status = 0x02;
cmd->SCp.Status = SAM_STAT_CHECK_CONDITION;
HOSTDATA(shpnt)->commands--;
if (!HOSTDATA(shpnt)->commands)
SETPORT(PORTA, 0); /* turn led off */
} else if(DONE_SC->SCp.Status==0x02) {
} else if(DONE_SC->SCp.Status==SAM_STAT_CHECK_CONDITION) {
#if defined(AHA152X_STAT)
HOSTDATA(shpnt)->busfree_with_check_condition++;
#endif
@ -1587,7 +1587,7 @@ static void busfree_run(struct Scsi_Host *shpnt)
DPRINTK(debug_eh, ERR_LEAD "CHECK CONDITION found\n", CMDINFO(DONE_SC));
#endif
if(!(DONE_SC->SCp.Status & not_issued)) {
if(!(DONE_SC->SCp.phase & not_issued)) {
Scsi_Cmnd *ptr = DONE_SC;
DONE_SC=NULL;
#if 0