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This fixes corrupted video capture, seen with IIDC/DCAM video and certain

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buffer settings.  (Regression since v3.4 inclusive.)
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Merge tag 'firewire-fix' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394

Pull firewire regression fix from Stefan Richter:
 "This fixes corrupted video capture, seen with IIDC/DCAM video and
  certain buffer settings.  (Regression since v3.4 inclusive.)"

* tag 'firewire-fix' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394:
  firewire: fix libdc1394/FlyCap2 iso event regression
This commit is contained in:
Linus Torvalds 2013-07-29 17:08:22 -07:00
commit 36f571e9ed
4 changed files with 14 additions and 4 deletions
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3
drivers/firewire/core-cdev.c
View file

@ -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);

10
drivers/firewire/ohci.c
View file

@ -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);

1
include/linux/firewire.h
View file

@ -436,6 +436,7 @@ struct fw_iso_context {
int type;
int channel;
int speed;
bool drop_overflow_headers;
size_t header_size;
union {
fw_iso_callback_t sc;

4
include/uapi/linux/firewire-cdev.h
View file

@ -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):
*