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cciss: separate error processing and command retrying code in sendcmd_withirq_core() 

Separate the error processing from sendcmd_withirq_core from the code
which retries commands.  The rationale for this is that the SCSI error
handling code can then be made to use sendcmd_withirq_core, but avoid
retrying commands.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cca.cpqcorp.net>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
scameron@beardog.cca.cpqcorp.net 2009-06-08 16:05:56 -05:00 committed by Jens Axboe
parent 3c2ab40296
commit 789a424ad1
2 changed files with 46 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

77
drivers/block/cciss.c
View File

@ -2292,26 +2292,12 @@ static int check_target_status(ctlr_info_t *h, CommandList_struct *c)
return IO_ERROR;
}
static int sendcmd_withirq_core(ctlr_info_t *h, CommandList_struct *c)
static int process_sendcmd_error(ctlr_info_t *h, CommandList_struct *c)
{
DECLARE_COMPLETION_ONSTACK(wait);
u64bit buff_dma_handle;
unsigned long flags;
int return_status = IO_OK;
resend_cmd2:
c->waiting = &wait;
/* Put the request on the tail of the queue and send it */
spin_lock_irqsave(CCISS_LOCK(h->ctlr), flags);
addQ(&h->reqQ, c);
h->Qdepth++;
start_io(h);
spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
wait_for_completion(&wait);
if (c->err_info->CommandStatus == 0)
goto command_done;
if (c->err_info->CommandStatus == CMD_SUCCESS)
return IO_OK;
switch (c->err_info->CommandStatus) {
case CMD_TARGET_STATUS:
@ -2322,7 +2308,7 @@ resend_cmd2:
/* expected for inquiry and report lun commands */
break;
case CMD_INVALID:
printk(KERN_WARNING "cciss: Cmd 0x%02x is "
printk(KERN_WARNING "cciss: cmd 0x%02x is "
"reported invalid\n", c->Request.CDB[0]);
return_status = IO_ERROR;
break;
@ -2355,19 +2341,7 @@ resend_cmd2:
printk(KERN_WARNING
"cciss%d: unsolicited abort 0x%02x\n", h->ctlr,
c->Request.CDB[0]);
if (c->retry_count < MAX_CMD_RETRIES) {
printk(KERN_WARNING
"cciss%d: retrying 0x%02x\n", h->ctlr,
c->Request.CDB[0]);
c->retry_count++;
/* erase the old error information */
memset(c->err_info, 0,
sizeof(ErrorInfo_struct));
return_status = IO_OK;
INIT_COMPLETION(wait);
goto resend_cmd2;
}
return_status = IO_ERROR;
return_status = IO_NEEDS_RETRY;
break;
default:
printk(KERN_WARNING "cciss: cmd 0x%02x returned "
@ -2375,6 +2349,44 @@ resend_cmd2:
c->err_info->CommandStatus);
return_status = IO_ERROR;
}
return return_status;
}
static int sendcmd_withirq_core(ctlr_info_t *h, CommandList_struct *c,
int attempt_retry)
{
DECLARE_COMPLETION_ONSTACK(wait);
u64bit buff_dma_handle;
unsigned long flags;
int return_status = IO_OK;
resend_cmd2:
c->waiting = &wait;
/* Put the request on the tail of the queue and send it */
spin_lock_irqsave(CCISS_LOCK(h->ctlr), flags);
addQ(&h->reqQ, c);
h->Qdepth++;
start_io(h);
spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
wait_for_completion(&wait);
if (c->err_info->CommandStatus == 0 || !attempt_retry)
goto command_done;
return_status = process_sendcmd_error(h, c);
if (return_status == IO_NEEDS_RETRY &&
c->retry_count < MAX_CMD_RETRIES) {
printk(KERN_WARNING "cciss%d: retrying 0x%02x\n", h->ctlr,
c->Request.CDB[0]);
c->retry_count++;
/* erase the old error information */
memset(c->err_info, 0, sizeof(ErrorInfo_struct));
return_status = IO_OK;
INIT_COMPLETION(wait);
goto resend_cmd2;
}
command_done:
/* unlock the buffers from DMA */
@ -2399,7 +2411,8 @@ static int sendcmd_withirq(__u8 cmd, int ctlr, void *buff, size_t size,
return_status = fill_cmd(c, cmd, ctlr, buff, size, page_code,
scsi3addr, cmd_type);
if (return_status == IO_OK)
return_status = sendcmd_withirq_core(h, c);
return_status = sendcmd_withirq_core(h, c, 1);
cmd_free(h, c, 0);
return return_status;
}

1
drivers/block/cciss.h
View File

@ -11,6 +11,7 @@
#define IO_OK 0
#define IO_ERROR 1
#define IO_NEEDS_RETRY 3
#define VENDOR_LEN 8
#define MODEL_LEN 16