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authorStefan Richter <stefanr@s5r6.in-berlin.de>2007-07-21 22:43:05 +0200
committerStefan Richter <stefanr@s5r6.in-berlin.de>2007-08-02 20:34:16 +0200
commit25659f7183376c6b37661da6141d5eaa21479061 (patch)
tree7ac9590d43a3c2b7760a88c00a39c1eb0f231745 /drivers/firewire
parente4f8cac5e07528f7e0bc21d3682c16c9de993ecb (diff)
firewire: fw-sbp2: set correct maximum payload (fixes CardBus adapters)
As far as I know, all CardBus FireWire 400 adapters have a maximum payload of 1024 bytes which is less than the speed-dependent limit of 2048 bytes. Fw-sbp2 has to take the host adapter's limit into account. This apparently fixes Juju's incompatibility with my CardBus cards, a NEC based card and a VIA based card. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Acked-by: Kristian Høgsberg <krh@redhat.com>
Diffstat (limited to 'drivers/firewire')
-rw-r--r--drivers/firewire/fw-sbp2.c5
-rw-r--r--drivers/firewire/fw-transaction.h2
2 files changed, 5 insertions, 2 deletions
diff --git a/drivers/firewire/fw-sbp2.c b/drivers/firewire/fw-sbp2.c
index 3e4a369d005..ba816ef6def 100644
--- a/drivers/firewire/fw-sbp2.c
+++ b/drivers/firewire/fw-sbp2.c
@@ -984,6 +984,7 @@ static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done)
struct fw_unit *unit = sd->unit;
struct fw_device *device = fw_device(unit->device.parent);
struct sbp2_command_orb *orb;
+ unsigned max_payload;
/*
* Bidirectional commands are not yet implemented, and unknown
@@ -1017,8 +1018,10 @@ static int sbp2_scsi_queuecommand(struct scsi_cmnd *cmd, scsi_done_fn_t done)
* specifies the max payload size as 2 ^ (max_payload + 2), so
* if we set this to max_speed + 7, we get the right value.
*/
+ max_payload = min(device->max_speed + 7,
+ device->card->max_receive - 1);
orb->request.misc =
- COMMAND_ORB_MAX_PAYLOAD(device->max_speed + 7) |
+ COMMAND_ORB_MAX_PAYLOAD(max_payload) |
COMMAND_ORB_SPEED(device->max_speed) |
COMMAND_ORB_NOTIFY;
diff --git a/drivers/firewire/fw-transaction.h b/drivers/firewire/fw-transaction.h
index 5ceaccd1056..fa7967b5740 100644
--- a/drivers/firewire/fw-transaction.h
+++ b/drivers/firewire/fw-transaction.h
@@ -231,7 +231,7 @@ struct fw_card {
unsigned long reset_jiffies;
unsigned long long guid;
- int max_receive;
+ unsigned max_receive;
int link_speed;
int config_rom_generation;