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staging/fwserial: Limit tx/rx to 1394-2008 spec maximum 

Per this conversation https://lkml.org/lkml/2012/11/27/587
limit the maximum transmission to the IEEE 1394-2008 specification
maximum size of 4096 bytes for asynchronous packets.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Acked-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley 2012-11-28 14:51:23 -05:00 committed by Greg Kroah-Hartman
parent 9929362348
commit 0555cb987a
3 changed files with 4 additions and 7 deletions
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3
drivers/staging/fwserial/TODO
View File

@ -12,9 +12,6 @@ TODOs
1. This driver uses the same unregistered vendor id that the firewire core does
(0xd00d1e). Perhaps this could be exposed as a define in
firewire-constants.h?
2. MAX_ASYNC_PAYLOAD needs to be publicly exposed by core/ohci
- otherwise how will this driver know the max size of address window to
open for one packet write?
3. Maybe device_max_receive() and link_speed_to_max_payload() should be
taken up by the firewire core?
4. To avoid dropping rx data while still limiting the maximum buffering,

2
drivers/staging/fwserial/fwserial.c
View File

@ -179,7 +179,7 @@ static void dump_profile(struct seq_file *m, struct stats *stats)
/* Returns the max receive packet size for the given card */
static inline int device_max_receive(struct fw_device *fw_device)
{
return 1 << (clamp_t(int, fw_device->max_rec, 8U, 13U) + 1);
return 1 << (clamp_t(int, fw_device->max_rec, 8U, 11U) + 1);
}
static void fwtty_log_tx_error(struct fwtty_port *port, int rcode)

6
drivers/staging/fwserial/fwserial.h
View File

@ -374,10 +374,10 @@ static inline void fwtty_bind_console(struct fwtty_port *port,
*/
static inline int link_speed_to_max_payload(unsigned speed)
{
static const int max_async[] = { 307, 614, 1229, 2458, 4916, 9832, };
BUILD_BUG_ON(ARRAY_SIZE(max_async) - 1 != SCODE_3200);
static const int max_async[] = { 307, 614, 1229, 2458, };
BUILD_BUG_ON(ARRAY_SIZE(max_async) - 1 != SCODE_800);
speed = clamp(speed, (unsigned) SCODE_100, (unsigned) SCODE_3200);
speed = clamp(speed, (unsigned) SCODE_100, (unsigned) SCODE_800);
if (limit_bw)
return max_async[speed];
else