diff options
| author | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2009-11-18 22:01:14 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2009-12-05 23:41:44 +0300 |
| commit | b1d33f4b0ae319ca79b6bafd6e815cbe0dcd7c14 (patch) | |
| tree | 5a86b5661e363b3d1fd3ce5a3b25cf9c03b7ee64 /drivers/media/dvb/firewire | |
| parent | a8aeb7836edac3e0cce1286eefbca793c54cbad0 (diff) | |
| download | linux-b1d33f4b0ae319ca79b6bafd6e815cbe0dcd7c14.tar.xz | |
V4L/DVB (13409): firedtv: packet requeuing is likely to succeed
Packet DMA buffers are queued either initially all at once (then, a
queueing failure will cause firedtv to release the DMA context as a
whole) or subsequently one by one as they recycled after use (then a
failure is extremely unlikely). Therefore we can be a little less
cautious when counting at which packet buffer to set the interrupt flag.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/dvb/firewire')
| -rw-r--r-- | drivers/media/dvb/firewire/firedtv-fw.c | 13 |
1 files changed, 4 insertions, 9 deletions
diff --git a/drivers/media/dvb/firewire/firedtv-fw.c b/drivers/media/dvb/firewire/firedtv-fw.c index 6954848b5803..d8408cea335f 100644 --- a/drivers/media/dvb/firewire/firedtv-fw.c +++ b/drivers/media/dvb/firewire/firedtv-fw.c @@ -79,19 +79,14 @@ struct firedtv_receive_context { static int queue_iso(struct firedtv_receive_context *ctx, int index) { struct fw_iso_packet p; - int err; p.payload_length = MAX_PACKET_SIZE; - p.interrupt = !(ctx->interrupt_packet & (IRQ_INTERVAL - 1)); + p.interrupt = !(++ctx->interrupt_packet & (IRQ_INTERVAL - 1)); p.skip = 0; p.header_length = ISO_HEADER_SIZE; - err = fw_iso_context_queue(ctx->context, &p, &ctx->buffer, - index * MAX_PACKET_SIZE); - if (!err) - ctx->interrupt_packet++; - - return err; + return fw_iso_context_queue(ctx->context, &p, &ctx->buffer, + index * MAX_PACKET_SIZE); } static void handle_iso(struct fw_iso_context *context, u32 cycle, @@ -150,7 +145,7 @@ static int start_iso(struct firedtv *fdtv) if (err) goto fail_context_destroy; - ctx->interrupt_packet = 1; + ctx->interrupt_packet = 0; ctx->current_packet = 0; for (i = 0; i < N_PAGES; i++) |