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authorBoaz Harrosh <bharrosh@panasas.com>2007-07-29 22:27:06 +0300
committerJames Bottomley <jejb@mulgrave.localdomain>2007-08-04 09:14:24 -0500
commit45333ffa6ffd2f493fc3853481984b6e60b4fb93 (patch)
tree77be77784c92689593b3b56e92a070da64f84745 /drivers/scsi/aha152x.c
parent66acdb0309507950376393f2fb1c8e7482fb4d52 (diff)
downloadop-kernel-dev-45333ffa6ffd2f493fc3853481984b6e60b4fb93.zip
op-kernel-dev-45333ffa6ffd2f493fc3853481984b6e60b4fb93.tar.gz
[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>
Diffstat (limited to 'drivers/scsi/aha152x.c')
-rw-r--r--drivers/scsi/aha152x.c55
1 files changed, 27 insertions, 28 deletions
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_hostdata {
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 @@ static int aha152x_internal_queue(Scsi_Cmnd *SCpnt, struct completion *complete,
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 @@ static int aha152x_internal_queue(Scsi_Cmnd *SCpnt, struct completion *complete,
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 @@ static void busfree_run(struct Scsi_Host *shpnt)
#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 @@ static void busfree_run(struct Scsi_Host *shpnt)
#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 @@ static void busfree_run(struct Scsi_Host *shpnt)
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);
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