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SubjectRe: [PATCH] scsi_error fix
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On Fri, 2003-03-07 at 16:43, Mike Anderson wrote:
> James Bottomley [James.Bottomley@steeleye.com] wrote:
>
> > @@ -702,8 +701,14 @@
> > * if the result was normal, then just pass it along to the
> > * upper level.
> > */
> > - if (rtn == SUCCESS)
> > + if (rtn == SUCCESS) {
> > + /* we don't want this command reissued, just
> > + * finished with the sense data, so set
> > + * retries to the max allowed to ensure it
> > + * won't get reissued */
> > + scmd->retries = scmd->allowed;
> > scsi_eh_finish_cmd(scmd, done_q);
> > + }
> > if (rtn != NEEDS_RETRY)
> > continue;
> >
>
> We might need to cover the case down below if we succeed on retry without
> reaching allowed.
>
> Another option is to look into re-sending the command from the
> scsi_queue_insert handler like we do with timeouts. The interface to the
> device should be the same from the LLDD's point of view just delayed
> some.

The attached should sweep up all of this. For NEEDS_RETRY, we will
retry until we reach the max retry count.

James

===== drivers/scsi/scsi_error.c 1.38 vs edited =====
--- 1.38/drivers/scsi/scsi_error.c Sat Feb 22 10:17:01 2003
+++ edited/drivers/scsi/scsi_error.c Fri Mar 7 16:15:02 2003
@@ -515,7 +515,7 @@
* actually did complete normally.
*/
if (rtn == SUCCESS) {
- int rtn = scsi_eh_completed_normally(scmd);
+ rtn = scsi_eh_completed_normally(scmd);
SCSI_LOG_ERROR_RECOVERY(3,
printk("%s: scsi_eh_completed_normally %x\n",
__FUNCTION__, rtn));
@@ -545,20 +545,20 @@
static int scsi_request_sense(struct scsi_cmnd *scmd)
{
static unsigned char generic_sense[6] =
- {REQUEST_SENSE, 0, 0, 0, 255, 0};
- unsigned char scsi_result0[256], *scsi_result = &scsi_result0[0];
+ {REQUEST_SENSE, 0, 0, 0, 254, 0};
+ unsigned char *scsi_result;
int saved_result;
int rtn;

memcpy(scmd->cmnd, generic_sense, sizeof(generic_sense));

- if (scmd->device->host->hostt->unchecked_isa_dma) {
- scsi_result = kmalloc(512, GFP_ATOMIC | __GFP_DMA);
- if (unlikely(!scsi_result)) {
- printk(KERN_ERR "%s: cannot allocate scsi_result.\n",
- __FUNCTION__);
- return FAILED;
- }
+ scsi_result = kmalloc(254, GFP_ATOMIC | (scmd->device->host->hostt->unchecked_isa_dma) ? __GFP_DMA : 0);
+
+
+ if (unlikely(!scsi_result)) {
+ printk(KERN_ERR "%s: cannot allocate scsi_result.\n",
+ __FUNCTION__);
+ return FAILED;
}

/*
@@ -568,11 +568,11 @@
* address (db). 0 is not a valid sense code.
*/
memset(scmd->sense_buffer, 0, sizeof(scmd->sense_buffer));
- memset(scsi_result, 0, 256);
+ memset(scsi_result, 0, 254);

saved_result = scmd->result;
scmd->request_buffer = scsi_result;
- scmd->request_bufflen = 256;
+ scmd->request_bufflen = 254;
scmd->use_sg = 0;
scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]);
scmd->sc_data_direction = SCSI_DATA_READ;
@@ -581,13 +581,12 @@
rtn = scsi_send_eh_cmnd(scmd, SENSE_TIMEOUT);

/* last chance to have valid sense data */
- if (!SCSI_SENSE_VALID(scmd)) {
+ if(!SCSI_SENSE_VALID(scmd)) {
memcpy(scmd->sense_buffer, scmd->request_buffer,
- sizeof(scmd->sense_buffer));
+ sizeof(scmd->sense_buffer));
}

- if (scsi_result != &scsi_result0[0])
- kfree(scsi_result);
+ kfree(scsi_result);

/*
* when we eventually call scsi_finish, we really wish to complete
@@ -703,25 +702,14 @@
* upper level.
*/
if (rtn == SUCCESS)
- scsi_eh_finish_cmd(scmd, done_q);
- if (rtn != NEEDS_RETRY)
+ /* we don't want this command reissued, just
+ * finished with the sense data, so set
+ * retries to the max allowed to ensure it
+ * won't get reissued */
+ scmd->retries = scmd->allowed;
+ else if (rtn != NEEDS_RETRY)
continue;

- /*
- * we only come in here if we want to retry a
- * command. the test to see whether the command
- * should be retried should be keeping track of the
- * number of tries, so we don't end up looping, of
- * course.
- */
- scmd->state = NEEDS_RETRY;
- rtn = scsi_eh_retry_cmd(scmd);
- if (rtn != SUCCESS)
- continue;
-
- /*
- * we eventually hand this one back to the top level.
- */
scsi_eh_finish_cmd(scmd, done_q);
}

===== drivers/scsi/scsi_lib.c 1.73 vs edited =====
--- 1.73/drivers/scsi/scsi_lib.c Sat Feb 22 14:35:33 2003
+++ edited/drivers/scsi/scsi_lib.c Fri Mar 7 15:19:46 2003
@@ -265,7 +265,6 @@
cmd->serial_number = 0;
cmd->serial_number_at_timeout = 0;
cmd->flags = 0;
- cmd->retries = 0;
cmd->abort_reason = 0;

memset(cmd->sense_buffer, 0, sizeof cmd->sense_buffer);
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