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scsi: hpsa: check for tag collision 

Correct rare multipath issue where a device is deleted with an
outstanding cmd which results in a tag collision.

The cmd eventually completes. If a collision is detected wait until
the command slot is cleared.

Reviewed-by: Justin Lindley <justin.lindley@microsemi.com>
Reviewed-by: David Carroll <david.carroll@microsemi.com>
Reviewed-by: Scott Teel <scott.teel@microsemi.com>
Signed-off-by: Don Brace <don.brace@microsemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Don Brace 2019-05-07 13:32:13 -05:00 committed by Martin K. Petersen
parent 0119208885
commit 4770e68d16
2 changed files with 15 additions and 7 deletions
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21
drivers/scsi/hpsa.c
View File

@ -5635,6 +5635,8 @@ static int hpsa_scsi_queue_command(struct Scsi_Host *sh, struct scsi_cmnd *cmd)
return 0;
}
c = cmd_tagged_alloc(h, cmd);
if (c == NULL)
return SCSI_MLQUEUE_DEVICE_BUSY;
/*
* Call alternate submit routine for I/O accelerated commands.
@ -6041,7 +6043,6 @@ static struct CommandList *cmd_tagged_alloc(struct ctlr_info *h,
BUG();
}
atomic_inc(&c->refcount);
if (unlikely(!hpsa_is_cmd_idle(c))) {
/*
* We expect that the SCSI layer will hand us a unique tag
@ -6049,14 +6050,20 @@ static struct CommandList *cmd_tagged_alloc(struct ctlr_info *h,
* two requests...because if the selected command isn't idle
* then someone is going to be very disappointed.
*/
dev_err(&h->pdev->dev,
"tag collision (tag=%d) in cmd_tagged_alloc().\n",
idx);
if (c->scsi_cmd != NULL)
scsi_print_command(c->scsi_cmd);
scsi_print_command(scmd);
if (idx != h->last_collision_tag) { /* Print once per tag */
dev_warn(&h->pdev->dev,
"%s: tag collision (tag=%d)\n", __func__, idx);
if (c->scsi_cmd != NULL)
scsi_print_command(c->scsi_cmd);
if (scmd)
scsi_print_command(scmd);
h->last_collision_tag = idx;
}
return NULL;
}
atomic_inc(&c->refcount);
hpsa_cmd_partial_init(h, idx, c);
return c;
}

1
drivers/scsi/hpsa.h
View File

@ -174,6 +174,7 @@ struct ctlr_info {
struct CfgTable __iomem *cfgtable;
int interrupts_enabled;
int max_commands;
int last_collision_tag; /* tags are global */
atomic_t commands_outstanding;
# define PERF_MODE_INT 0
# define DOORBELL_INT 1