From b1d33f4b0ae319ca79b6bafd6e815cbe0dcd7c14 Mon Sep 17 00:00:00 2001 From: Stefan Richter Date: Wed, 18 Nov 2009 16:01:14 -0300 Subject: [PATCH] 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 Signed-off-by: Mauro Carvalho Chehab --- drivers/media/dvb/firewire/firedtv-fw.c | 13 ++++--------- 1 file 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++) -- 2.20.1