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firewire: fw-sbp2: set correct maximum payload (fixes CardBus adapters)

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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>
This commit is contained in:
Stefan Richter 2007-07-21 22:43:05 +02:00
parent e4f8cac5e0
commit 25659f7183
2 changed files with 5 additions and 2 deletions
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5
drivers/firewire/fw-sbp2.c
View file

@ -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;

2
drivers/firewire/fw-transaction.h
View file

@ -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;