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| author | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2011-04-22 12:21:44 +0200 |
|---|---|---|
| committer | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2011-05-10 22:53:45 +0200 |
| commit | b75ca5ea8e439893121ad80406a3c04c4b7612ab (patch) | |
| tree | 9a260ae737d99d66aa3d42fdfb0bda2125ca47e2 /drivers/firewire | |
| parent | 6ea9e7bbfc389a12d52646449a201fe933ccd663 (diff) | |
| download | lwn-b75ca5ea8e439893121ad80406a3c04c4b7612ab.tar.gz lwn-b75ca5ea8e439893121ad80406a3c04c4b7612ab.zip | |
firewire: sbp2: omit Scsi_Host lock from queuecommand
firewire-sbp2 already takes care for internal serialization where
required (ORB list accesses), and it does not use cmd->serial_number
internally. Hence it is safe to not grab the shost lock around
queuecommand.
While we are at housekeeping, drop a redundant struct member:
sbp2_command_orb.done is set once in a hot path and dereferenced once in
a hot path. We can as well dereference sbp2_command_orb.cmd->scsi_done
instead.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'drivers/firewire')
| -rw-r--r-- | drivers/firewire/sbp2.c | 20 |
1 files changed, 6 insertions, 14 deletions
diff --git a/drivers/firewire/sbp2.c b/drivers/firewire/sbp2.c index 77ed589b360d..cc002e92275a 100644 --- a/drivers/firewire/sbp2.c +++ b/drivers/firewire/sbp2.c @@ -125,9 +125,6 @@ MODULE_PARM_DESC(workarounds, "Work around device bugs (default = 0" ", override internal blacklist = " __stringify(SBP2_WORKAROUND_OVERRIDE) ", or a combination)"); -/* I don't know why the SCSI stack doesn't define something like this... */ -typedef void (*scsi_done_fn_t)(struct scsi_cmnd *); - static const char sbp2_driver_name[] = "sbp2"; /* @@ -314,7 +311,6 @@ struct sbp2_command_orb { u8 command_block[SBP2_MAX_CDB_SIZE]; } request; struct scsi_cmnd *cmd; - scsi_done_fn_t done; struct sbp2_logical_unit *lu; struct sbp2_pointer page_table[SG_ALL] __attribute__((aligned(8))); @@ -1398,7 +1394,7 @@ static void complete_command_orb(struct sbp2_orb *base_orb, sbp2_unmap_scatterlist(device->card->device, orb); orb->cmd->result = result; - orb->done(orb->cmd); + orb->cmd->scsi_done(orb->cmd); } static int sbp2_map_scatterlist(struct sbp2_command_orb *orb, @@ -1463,7 +1459,8 @@ static int sbp2_map_scatterlist(struct sbp2_command_orb *orb, /* SCSI stack integration */ -static int sbp2_scsi_queuecommand_lck(struct scsi_cmnd *cmd, scsi_done_fn_t done) +static int sbp2_scsi_queuecommand(struct Scsi_Host *shost, + struct scsi_cmnd *cmd) { struct sbp2_logical_unit *lu = cmd->device->hostdata; struct fw_device *device = target_device(lu->tgt); @@ -1477,7 +1474,7 @@ static int sbp2_scsi_queuecommand_lck(struct scsi_cmnd *cmd, scsi_done_fn_t done if (cmd->sc_data_direction == DMA_BIDIRECTIONAL) { fw_error("Can't handle DMA_BIDIRECTIONAL, rejecting command\n"); cmd->result = DID_ERROR << 16; - done(cmd); + cmd->scsi_done(cmd); return 0; } @@ -1490,11 +1487,8 @@ static int sbp2_scsi_queuecommand_lck(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->lu = lu; - orb->done = done; - orb->cmd = cmd; - + orb->lu = lu; + orb->cmd = cmd; orb->request.next.high = cpu_to_be32(SBP2_ORB_NULL); orb->request.misc = cpu_to_be32( COMMAND_ORB_MAX_PAYLOAD(lu->tgt->max_payload) | @@ -1529,8 +1523,6 @@ static int sbp2_scsi_queuecommand_lck(struct scsi_cmnd *cmd, scsi_done_fn_t done return retval; } -static DEF_SCSI_QCMD(sbp2_scsi_queuecommand) - static int sbp2_scsi_slave_alloc(struct scsi_device *sdev) { struct sbp2_logical_unit *lu = sdev->hostdata; |