Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=0ceb47987d31f8529c60f1e802e0523fcde9492c
Commit:     0ceb47987d31f8529c60f1e802e0523fcde9492c
Parent:     b1ee0795276f976118f832313488e6daf83ff542
Author:     Boaz Harrosh <[EMAIL PROTECTED]>
AuthorDate: Sun Jul 29 22:22:04 2007 +0300
Committer:  James Bottomley <[EMAIL PROTECTED]>
CommitDate: Sat Aug 4 09:12:48 2007 -0500

    [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 <[EMAIL PROTECTED]>
    Signed-off-by: James Bottomley <[EMAIL PROTECTED]>
---
 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 c841f11..dc7d84b 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
-
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