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| author | Boaz Harrosh <bharrosh@panasas.com> | 2007-07-29 23:22:04 +0400 |
|---|---|---|
| committer | James Bottomley <jejb@mulgrave.localdomain> | 2007-08-04 18:12:48 +0400 |
| commit | 0ceb47987d31f8529c60f1e802e0523fcde9492c (patch) | |
| tree | 475bcd2d6bfa14a659a3b4612261fc8f9773d0b4 | |
| parent | b1ee0795276f976118f832313488e6daf83ff542 (diff) | |
| download | linux-0ceb47987d31f8529c60f1e802e0523fcde9492c.tar.xz | |
[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>
| -rw-r--r-- | drivers/scsi/aha152x.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/scsi/aha152x.c b/drivers/scsi/aha152x.c index c841f11f4e32..dc7d84bae96b 100644 --- a/drivers/scsi/aha152x.c +++ b/drivers/scsi/aha152x.c @@ -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 |