Date: Sat, 21 Jul 2007 22:43:05 +0200 (CEST) From: Stefan Richter Subject: 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 Acked-by: Kristian Høgsberg --- drivers/firewire/fw-sbp2.c | 5 ++++- drivers/firewire/fw-transaction.h | 2 +- 2 files changed, 5 insertions(+), 2 deletions(-) Index: linux/drivers/firewire/fw-sbp2.c =================================================================== --- linux.orig/drivers/firewire/fw-sbp2.c +++ linux/drivers/firewire/fw-sbp2.c @@ -986,6 +986,7 @@ static int sbp2_scsi_queuecommand(struct 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 @@ -1019,8 +1020,10 @@ static int sbp2_scsi_queuecommand(struct * 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; Index: linux/drivers/firewire/fw-transaction.h =================================================================== --- linux.orig/drivers/firewire/fw-transaction.h +++ linux/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;