[SCSI] aha152x: Fix check_condition code-path
check_condition code-path was similar but more
complicated to Reset. It went like this:
1. extra space was allocated at aha152x_scdata for mirroring
scsi_cmnd members.
2. At aha152x_internal_queue() every not check_condition
(REQUEST_SENSE) command was copied to above members in
case of error.
3. At busfree_run() in the DONE_CS phase if a Status of
SAM_STAT_CHECK_CONDITION was detected. The command was
re-queued Internally using aha152x_internal_queue(,,check_condition,)
The old command members are over written with the
REQUEST_SENSE info.
4. At busfree_run() in the DONE_CS phase again. If it is a
check_condition command, info was restored from mirror
made at first call to aha152x_internal_queue() (see 2)
and the command is completed.
What I did is:
1. Allocate less space in aha152x_scdata only for the 16-byte
original command. (which is actually not needed by scsi-ml
anymore at this stage. But this is to much knowledge of scsi-ml)
2. If Status == SAM_STAT_CHECK_CONDITION, then like before
re-queue a REQUEST_SENSE command. But only now save original
command members. (Less of them)
3. In aha152x_internal_queue(), just like for Reset, use the
check_condition hint to set differently the working members.
execute the command.
4. At busfree_run() in the DONE_CS phase again. restore needed
members.
While at it. This patch fixes a BUG. Old code when sending
a REQUEST_SENSE for a failed command. Would than return with
cmd->resid == 0 which was the status of the REQUEST_SENSE.
The failing command resid was lost. And when would resid
be interesting if not on a failing command?
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
diff --git a/drivers/scsi/aha152x.c b/drivers/scsi/aha152x.c
index d7ca86f..cf49ed5 100644
--- a/drivers/scsi/aha152x.c
+++ b/drivers/scsi/aha152x.c
@@ -552,14 +552,11 @@
struct aha152x_scdata {
Scsi_Cmnd *next; /* next sc in queue */
struct completion *done;/* semaphore to block on */
- unsigned char cmd_len;
- unsigned char cmnd[MAX_COMMAND_SIZE];
- unsigned short use_sg;
- unsigned request_bufflen;
- void *request_buffer;
+ unsigned char aha_orig_cmd_len;
+ unsigned char aha_orig_cmnd[MAX_COMMAND_SIZE];
+ int aha_orig_resid;
};
-
/* access macros for hostdata */
#define HOSTDATA(shpnt) ((struct aha152x_hostdata *) &shpnt->hostdata)
@@ -997,20 +994,11 @@
return FAILED;
}
} else {
- struct aha152x_scdata *sc;
-
SCpnt->host_scribble = kmalloc(sizeof(struct aha152x_scdata), GFP_ATOMIC);
if(SCpnt->host_scribble==0) {
printk(ERR_LEAD "allocation failed\n", CMDINFO(SCpnt));
return FAILED;
}
-
- sc = SCDATA(SCpnt);
- memcpy(sc->cmnd, SCpnt->cmnd, sizeof(sc->cmnd));
- sc->request_buffer = SCpnt->request_buffer;
- sc->request_bufflen = SCpnt->request_bufflen;
- sc->use_sg = SCpnt->use_sg;
- sc->cmd_len = SCpnt->cmd_len;
}
SCNEXT(SCpnt) = NULL;
@@ -1023,10 +1011,16 @@
SCp.buffers_residual : left buffers in list
SCp.phase : current state of the command */
- if(phase & resetting) {
- SCpnt->SCp.ptr = NULL;
- SCpnt->SCp.this_residual = 0;
- SCpnt->resid = 0;
+ if (phase & (check_condition|resetting)) {
+ if (phase & check_condition) {
+ SCpnt->SCp.ptr = SCpnt->sense_buffer;
+ SCpnt->SCp.this_residual = sizeof(SCpnt->sense_buffer);
+ SCpnt->resid = sizeof(SCpnt->sense_buffer);
+ } else {
+ SCpnt->SCp.ptr = NULL;
+ SCpnt->SCp.this_residual = 0;
+ SCpnt->resid = 0;
+ }
SCpnt->SCp.buffer = NULL;
SCpnt->SCp.buffers_residual = 0;
} else {
@@ -1568,11 +1562,9 @@
#endif
/* restore old command */
- memcpy(cmd->cmnd, sc->cmnd, sizeof(sc->cmnd));
- cmd->request_buffer = sc->request_buffer;
- cmd->request_bufflen = sc->request_bufflen;
- cmd->use_sg = sc->use_sg;
- cmd->cmd_len = sc->cmd_len;
+ memcpy(cmd->cmnd, sc->aha_orig_cmnd, sizeof(cmd->cmnd));
+ cmd->cmd_len = sc->aha_orig_cmd_len;
+ cmd->resid = sc->aha_orig_resid;
cmd->SCp.Status = SAM_STAT_CHECK_CONDITION;
@@ -1588,12 +1580,22 @@
#endif
if(!(DONE_SC->SCp.phase & not_issued)) {
+ struct aha152x_scdata *sc;
Scsi_Cmnd *ptr = DONE_SC;
DONE_SC=NULL;
#if 0
DPRINTK(debug_eh, ERR_LEAD "requesting sense\n", CMDINFO(ptr));
#endif
+ /* save old command */
+ sc = SCDATA(ptr);
+ /* It was allocated in aha152x_internal_queue? */
+ BUG_ON(!sc);
+ memcpy(sc->aha_orig_cmnd, ptr->cmnd,
+ sizeof(ptr->cmnd));
+ sc->aha_orig_cmd_len = ptr->cmd_len;
+ sc->aha_orig_resid = ptr->resid;
+
ptr->cmnd[0] = REQUEST_SENSE;
ptr->cmnd[1] = 0;
ptr->cmnd[2] = 0;
@@ -1601,10 +1603,7 @@
ptr->cmnd[4] = sizeof(ptr->sense_buffer);
ptr->cmnd[5] = 0;
ptr->cmd_len = 6;
- ptr->use_sg = 0;
- ptr->request_buffer = ptr->sense_buffer;
- ptr->request_bufflen = sizeof(ptr->sense_buffer);
-
+
DO_UNLOCK(flags);
aha152x_internal_queue(ptr, NULL, check_condition, ptr->scsi_done);
DO_LOCK(flags);
