diff options
Diffstat (limited to 'drivers/firewire/fw-sbp2.c')
| -rw-r--r-- | drivers/firewire/fw-sbp2.c | 49 |
1 files changed, 40 insertions, 9 deletions
diff --git a/drivers/firewire/fw-sbp2.c b/drivers/firewire/fw-sbp2.c index ba816ef6def..238730f75db 100644 --- a/drivers/firewire/fw-sbp2.c +++ b/drivers/firewire/fw-sbp2.c @@ -159,6 +159,7 @@ struct sbp2_pointer { struct sbp2_orb { struct fw_transaction t; + struct kref kref; dma_addr_t request_bus; int rcode; struct sbp2_pointer pointer; @@ -280,6 +281,14 @@ static const struct { }; static void +free_orb(struct kref *kref) +{ + struct sbp2_orb *orb = container_of(kref, struct sbp2_orb, kref); + + kfree(orb); +} + +static void sbp2_status_write(struct fw_card *card, struct fw_request *request, int tcode, int destination, int source, int generation, int speed, @@ -312,8 +321,8 @@ sbp2_status_write(struct fw_card *card, struct fw_request *request, spin_lock_irqsave(&card->lock, flags); list_for_each_entry(orb, &sd->orb_list, link) { if (STATUS_GET_ORB_HIGH(status) == 0 && - STATUS_GET_ORB_LOW(status) == orb->request_bus && - orb->rcode == RCODE_COMPLETE) { + STATUS_GET_ORB_LOW(status) == orb->request_bus) { + orb->rcode = RCODE_COMPLETE; list_del(&orb->link); break; } @@ -325,6 +334,8 @@ sbp2_status_write(struct fw_card *card, struct fw_request *request, else fw_error("status write for unknown orb\n"); + kref_put(&orb->kref, free_orb); + fw_send_response(card, request, RCODE_COMPLETE); } @@ -335,13 +346,27 @@ complete_transaction(struct fw_card *card, int rcode, struct sbp2_orb *orb = data; unsigned long flags; - orb->rcode = rcode; - if (rcode != RCODE_COMPLETE) { - spin_lock_irqsave(&card->lock, flags); + /* + * This is a little tricky. We can get the status write for + * the orb before we get this callback. The status write + * handler above will assume the orb pointer transaction was + * successful and set the rcode to RCODE_COMPLETE for the orb. + * So this callback only sets the rcode if it hasn't already + * been set and only does the cleanup if the transaction + * failed and we didn't already get a status write. + */ + spin_lock_irqsave(&card->lock, flags); + + if (orb->rcode == -1) + orb->rcode = rcode; + if (orb->rcode != RCODE_COMPLETE) { list_del(&orb->link); - spin_unlock_irqrestore(&card->lock, flags); orb->callback(orb, NULL); } + + spin_unlock_irqrestore(&card->lock, flags); + + kref_put(&orb->kref, free_orb); } static void @@ -360,6 +385,10 @@ sbp2_send_orb(struct sbp2_orb *orb, struct fw_unit *unit, list_add_tail(&orb->link, &sd->orb_list); spin_unlock_irqrestore(&device->card->lock, flags); + /* Take a ref for the orb list and for the transaction callback. */ + kref_get(&orb->kref); + kref_get(&orb->kref); + fw_send_request(device->card, &orb->t, TCODE_WRITE_BLOCK_REQUEST, node_id, generation, device->max_speed, offset, &orb->pointer, sizeof(orb->pointer), @@ -416,6 +445,7 @@ sbp2_send_management_orb(struct fw_unit *unit, int node_id, int generation, if (orb == NULL) return -ENOMEM; + kref_init(&orb->base.kref); orb->response_bus = dma_map_single(device->card->device, &orb->response, sizeof(orb->response), DMA_FROM_DEVICE); @@ -490,7 +520,7 @@ sbp2_send_management_orb(struct fw_unit *unit, int node_id, int generation, if (response) fw_memcpy_from_be32(response, orb->response, sizeof(orb->response)); - kfree(orb); + kref_put(&orb->base.kref, free_orb); return retval; } @@ -886,7 +916,6 @@ complete_command_orb(struct sbp2_orb *base_orb, struct sbp2_status *status) orb->cmd->result = result; orb->done(orb->cmd); - kfree(orb); } static int sbp2_command_orb_map_scatterlist(struct sbp2_command_orb *orb) @@ -1005,6 +1034,7 @@ static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done) /* Initialize rcode to something not RCODE_COMPLETE. */ orb->base.rcode = -1; + kref_init(&orb->base.kref); orb->unit = unit; orb->done = done; @@ -1051,10 +1081,11 @@ static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done) sbp2_send_orb(&orb->base, unit, sd->node_id, sd->generation, sd->command_block_agent_address + SBP2_ORB_POINTER); + kref_put(&orb->base.kref, free_orb); return 0; fail_mapping: - kfree(orb); + kref_put(&orb->base.kref, free_orb); fail_alloc: return SCSI_MLQUEUE_HOST_BUSY; } |