diff options
| -rw-r--r-- | drivers/scsi/hpsa.c | 7 | ||||
| -rw-r--r-- | drivers/scsi/hpsa.h | 1 |
2 files changed, 6 insertions, 2 deletions
diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c index c95a20c5269b..72abcf3bfabf 100644 --- a/drivers/scsi/hpsa.c +++ b/drivers/scsi/hpsa.c @@ -4649,9 +4649,10 @@ static struct CommandList *cmd_alloc(struct ctlr_info *h) union u64bit temp64; dma_addr_t cmd_dma_handle, err_dma_handle; int refcount; - unsigned long offset = 0; + unsigned long offset; - /* There is some *extremely* small but non-zero chance that that + /* + * There is some *extremely* small but non-zero chance that that * multiple threads could get in here, and one thread could * be scanning through the list of bits looking for a free * one, but the free ones are always behind him, and other @@ -4662,6 +4663,7 @@ static struct CommandList *cmd_alloc(struct ctlr_info *h) * infrequently as to be indistinguishable from never. */ + offset = h->last_allocation; /* benignly racy */ for (;;) { i = find_next_zero_bit(h->cmd_pool_bits, h->nr_cmds, offset); if (unlikely(i == h->nr_cmds)) { @@ -4679,6 +4681,7 @@ static struct CommandList *cmd_alloc(struct ctlr_info *h) h->cmd_pool_bits + (i / BITS_PER_LONG)); break; /* it's ours now. */ } + h->last_allocation = i; /* benignly racy */ /* Zero out all of commandlist except the last field, refcount */ memset(c, 0, offsetof(struct CommandList, refcount)); diff --git a/drivers/scsi/hpsa.h b/drivers/scsi/hpsa.h index 679e4d2272e0..981479a13935 100644 --- a/drivers/scsi/hpsa.h +++ b/drivers/scsi/hpsa.h @@ -133,6 +133,7 @@ struct ctlr_info { struct CfgTable __iomem *cfgtable; int interrupts_enabled; int max_commands; + int last_allocation; atomic_t commands_outstanding; # define PERF_MODE_INT 0 # define DOORBELL_INT 1 |