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authorStefan Richter <stefanr@s5r6.in-berlin.de>2008-08-09 20:22:17 +0200
committerStefan Richter <stefanr@s5r6.in-berlin.de>2008-10-15 22:21:10 +0200
commit4bbc1bdd010cbfcb749e4f947161ec3ab3337893 (patch)
tree77478b6c1bc693ba4dbddd4bd14c063846ec63c9 /drivers
parent09b12dd4e3caff165a0f17a2f3ebd2bbc8544cc6 (diff)
downloadop-kernel-dev-4bbc1bdd010cbfcb749e4f947161ec3ab3337893.zip
op-kernel-dev-4bbc1bdd010cbfcb749e4f947161ec3ab3337893.tar.gz
firewire: fw-sbp2: fix another small generation access bug
queuecommand() looked at the remote and local node IDs before it read the bus generation. The corresponding race with sbp2_reconnect updating these data was probably impossible to happen though because the current code blocks the SCSI layer during reconnection. However, better safe than sorry, especially if someone later improves the code to not block the SCSI layer. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/firewire/fw-sbp2.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/firewire/fw-sbp2.c b/drivers/firewire/fw-sbp2.c
index 5d8411a..ef0b9b4 100644
--- a/drivers/firewire/fw-sbp2.c
+++ b/drivers/firewire/fw-sbp2.c
@@ -1423,7 +1423,7 @@ static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done)
struct fw_device *device = fw_device(lu->tgt->unit->device.parent);
struct sbp2_command_orb *orb;
unsigned int max_payload;
- int retval = SCSI_MLQUEUE_HOST_BUSY;
+ int generation, retval = SCSI_MLQUEUE_HOST_BUSY;
/*
* Bidirectional commands are not yet implemented, and unknown
@@ -1467,6 +1467,9 @@ static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done)
if (cmd->sc_data_direction == DMA_FROM_DEVICE)
orb->request.misc |= cpu_to_be32(COMMAND_ORB_DIRECTION);
+ generation = device->generation;
+ smp_rmb(); /* sbp2_map_scatterlist looks at tgt->address_high */
+
if (scsi_sg_count(cmd) && sbp2_map_scatterlist(orb, device, lu) < 0)
goto out;
@@ -1479,7 +1482,7 @@ static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done)
if (dma_mapping_error(device->card->device, orb->base.request_bus))
goto out;
- sbp2_send_orb(&orb->base, lu, lu->tgt->node_id, lu->generation,
+ sbp2_send_orb(&orb->base, lu, lu->tgt->node_id, generation,
lu->command_block_agent_address + SBP2_ORB_POINTER);
retval = 0;
out:
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