This is a note to let you know that I've just added the patch titled
firewire: fix libdc1394/FlyCap2 iso event regression
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
firewire-fix-libdc1394-flycap2-iso-event-regression.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 0699a73af3811b66b1ab5650575acee5eea841ab Mon Sep 17 00:00:00 2001
From: Clemens Ladisch <clemens@xxxxxxxxxx>
Date: Mon, 22 Jul 2013 21:32:09 +0200
Subject: firewire: fix libdc1394/FlyCap2 iso event regression
From: Clemens Ladisch <clemens@xxxxxxxxxx>
commit 0699a73af3811b66b1ab5650575acee5eea841ab upstream.
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 <stepan.salenikovich@xxxxxxxxx>
Tested-by: Josep Bosch <jep250@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # 3.4+
Signed-off-by: Clemens Ladisch <clemens@xxxxxxxxxx>
Signed-off-by: Stefan Richter <stefanr@xxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/firewire/core-cdev.c | 3 +++
drivers/firewire/ohci.c | 10 ++++++++--
include/linux/firewire-cdev.h | 4 ++--
include/linux/firewire.h | 1 +
4 files changed, 14 insertions(+), 4 deletions(-)
--- a/drivers/firewire/core-cdev.c
+++ b/drivers/firewire/core-cdev.c
@@ -53,6 +53,7 @@
#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;
@@ -998,6 +999,8 @@ static int ioctl_create_iso_context(stru
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);
--- a/drivers/firewire/ohci.c
+++ b/drivers/firewire/ohci.c
@@ -2694,8 +2694,11 @@ static void copy_iso_headers(struct iso_
{
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]);
@@ -2855,8 +2858,11 @@ static int handle_it_packet(struct conte
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);
--- a/include/linux/firewire-cdev.h
+++ b/include/linux/firewire-cdev.h
@@ -215,8 +215,8 @@ struct fw_cdev_event_request2 {
* with the %FW_CDEV_ISO_INTERRUPT bit set, when explicitly requested with
* %FW_CDEV_IOC_FLUSH_ISO, or when there have been so many completed packets
* without the interrupt bit set that the kernel's internal buffer for @header
- * is about to overflow. (In the last case, kernels with ABI version < 5 drop
- * header data up to the next interrupt packet.)
+ * is about to overflow. (In the last case, ABI versions < 5 drop header data
+ * up to the next interrupt packet.)
*
* Isochronous transmit events (context type %FW_CDEV_ISO_CONTEXT_TRANSMIT):
*
--- a/include/linux/firewire.h
+++ b/include/linux/firewire.h
@@ -409,6 +409,7 @@ struct fw_iso_context {
int type;
int channel;
int speed;
+ bool drop_overflow_headers;
size_t header_size;
union {
fw_iso_callback_t sc;
Patches currently in stable-queue which might be from clemens@xxxxxxxxxx are
queue-3.4/firewire-fix-libdc1394-flycap2-iso-event-regression.patch
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