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Fix iso_shutdown with juju firewire stack 

Make iso start/stop/start sequences on the same handle, such as those used
by apps such as MythTV behave as expected. I can finally watch video off my
cable box over FireWire using MythTV w/the juju stack now. :)

Initially, seemed a one-liner might be the ticket (setting handle->iso.fd = -1
at the end of fw_iso_shutdown()), but that led to memory corruption and a
locked up system. What ultimately worked was essentially mimicking what the
old stack did to track iso state, and call fw_iso_stop() from
fw_iso_shutdown() as needed.

Nb: Only lightly tested with iso receive via MythTV, but its all fairly
straight-forward, I think.

Signed-off-by: Jarod Wilson <jarod@redhat.com>
Signed-off-by: Dan Dennedy <dan@dennedy.org>
This commit is contained in:
Jarod Wilson 2008-12-09 00:08:35 -05:00 committed by Dan Dennedy
parent 0c1ddb9be2
commit d69397ae8f
2 changed files with 22 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
src/fw-iso.c
View File

@ -1,6 +1,6 @@
/* -*- c-basic-offset: 8 -*-
*
* raw1394-iso.c -- Emulation of the raw1394 rawiso API on the firewire stack
* fw-iso.c -- Emulation of the raw1394 rawiso API on the firewire stack
*
* Copyright (C) 2007 Kristian Hoegsberg <krh@bitplanet.net>
*
@ -141,7 +141,14 @@ int fw_iso_xmit_start(raw1394handle_t handle, int start_on_cycle,
return retval;
}
return queue_xmit_packets(handle, fwhandle->iso.buf_packets);
retval = queue_xmit_packets(handle, fwhandle->iso.buf_packets);
if (retval)
return -1;
else
fwhandle->iso.state = ISO_ACTIVE;
return 0;
}
static int
@ -224,7 +231,12 @@ int fw_iso_recv_start(fw_handle_t handle, int start_on_cycle,
start_iso.sync = 0;
start_iso.handle = 0;
return ioctl(handle->iso.fd, FW_CDEV_IOC_START_ISO, &start_iso);
if (ioctl(handle->iso.fd, FW_CDEV_IOC_START_ISO, &start_iso))
return -1;
else
handle->iso.state = ISO_ACTIVE;
return 0;
}
static int handle_iso_event(raw1394handle_t handle,
@ -445,6 +457,7 @@ iso_init(fw_handle_t handle, int type,
handle->iso.head = handle->iso.buffer;
handle->iso.tail = handle->iso.buffer;
handle->iso.first_payload = handle->iso.buffer;
handle->iso.state = ISO_STOPPED;
return 0;
}
@ -521,15 +534,20 @@ void fw_iso_stop(fw_handle_t handle)
handle->iso.first_payload = handle->iso.buffer;
handle->iso.packet_phase = 0;
handle->iso.packet_count = 0;
handle->iso.packet_index = 0;
handle->iso.state = ISO_STOPPED;
}
void fw_iso_shutdown(fw_handle_t handle)
{
munmap(handle->iso.buffer,
handle->iso.buf_packets * handle->iso.max_packet_size);
if (handle->iso.state != ISO_STOPPED)
fw_iso_stop(handle);
close(handle->iso.fd);
free(handle->iso.packets);
handle->iso.packets = NULL;
handle->iso.fd = -1;
}
int fw_read_cycle_timer(fw_handle_t handle,

1
src/fw.h
View File

@ -129,6 +129,7 @@ struct fw_handle {
int prebuffer;
int start_on_cycle;
enum raw1394_iso_dma_recv_mode recv_mode;
enum { ISO_STOPPED, ISO_ACTIVE } state;
raw1394_iso_xmit_handler_t xmit_handler;
raw1394_iso_recv_handler_t recv_handler;
unsigned char *buffer, *buffer_end, *head;