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authorBoaz Harrosh <bharrosh@panasas.com>2007-07-29 22:22:04 +0300
committerJames Bottomley <jejb@mulgrave.localdomain>2007-08-04 09:12:48 -0500
commit0ceb47987d31f8529c60f1e802e0523fcde9492c (patch)
tree475bcd2d6bfa14a659a3b4612261fc8f9773d0b4
parentb1ee0795276f976118f832313488e6daf83ff542 (diff)
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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>
-rw-r--r--drivers/scsi/aha152x.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/scsi/aha152x.c b/drivers/scsi/aha152x.c
index c841f11f4e3..dc7d84bae96 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