From 0699a73af3811b66b1ab5650575acee5eea841ab Mon Sep 17 00:00:00 2001 From: Clemens Ladisch Date: Mon, 22 Jul 2013 21:32:09 +0200 Subject: firewire: fix libdc1394/FlyCap2 iso event regression Commit 18d627113b83 (firewire: prevent dropping of completed iso packet header data) was intended to be an obvious bug fix, but libdc1394 and FlyCap2 depend on the old behaviour by ignoring all returned information and thus not noticing that not all packets have been received yet. The result was that the video frame buffers would be saved before they contained the correct data. Reintroduce the old behaviour for old clients. Tested-by: Stepan Salenikovich Tested-by: Josep Bosch Cc: # 3.4+ Signed-off-by: Clemens Ladisch Signed-off-by: Stefan Richter --- drivers/firewire/core-cdev.c | 3 +++ drivers/firewire/ohci.c | 10 ++++++++-- 2 files changed, 11 insertions(+), 2 deletions(-) (limited to 'drivers/firewire') diff --git a/drivers/firewire/core-cdev.c b/drivers/firewire/core-cdev.c index 7ef316fdc4d9..ac1b43a04285 100644 --- a/drivers/firewire/core-cdev.c +++ b/drivers/firewire/core-cdev.c @@ -54,6 +54,7 @@ #define FW_CDEV_KERNEL_VERSION 5 #define FW_CDEV_VERSION_EVENT_REQUEST2 4 #define FW_CDEV_VERSION_ALLOCATE_REGION_END 4 +#define FW_CDEV_VERSION_AUTO_FLUSH_ISO_OVERFLOW 5 struct client { u32 version; @@ -1005,6 +1006,8 @@ static int ioctl_create_iso_context(struct client *client, union ioctl_arg *arg) a->channel, a->speed, a->header_size, cb, client); if (IS_ERR(context)) return PTR_ERR(context); + if (client->version < FW_CDEV_VERSION_AUTO_FLUSH_ISO_OVERFLOW) + context->drop_overflow_headers = true; /* We only support one context at this time. */ spin_lock_irq(&client->lock); diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c index 9e1db6490b9a..afb701ec90ca 100644 --- a/drivers/firewire/ohci.c +++ b/drivers/firewire/ohci.c @@ -2749,8 +2749,11 @@ static void copy_iso_headers(struct iso_context *ctx, const u32 *dma_hdr) { u32 *ctx_hdr; - if (ctx->header_length + ctx->base.header_size > PAGE_SIZE) + if (ctx->header_length + ctx->base.header_size > PAGE_SIZE) { + if (ctx->base.drop_overflow_headers) + return; flush_iso_completions(ctx); + } ctx_hdr = ctx->header + ctx->header_length; ctx->last_timestamp = (u16)le32_to_cpu((__force __le32)dma_hdr[0]); @@ -2910,8 +2913,11 @@ static int handle_it_packet(struct context *context, sync_it_packet_for_cpu(context, d); - if (ctx->header_length + 4 > PAGE_SIZE) + if (ctx->header_length + 4 > PAGE_SIZE) { + if (ctx->base.drop_overflow_headers) + return 1; flush_iso_completions(ctx); + } ctx_hdr = ctx->header + ctx->header_length; ctx->last_timestamp = le16_to_cpu(last->res_count); -- cgit v1.2.3