diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2013-07-29 17:08:22 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-07-29 17:08:22 -0700 |
| commit | 36f571e9ed0419e73d127e18aa8992ced867268c (patch) | |
| tree | 94fc210322484b5fa082f28dd2bad702c1685ba9 | |
| parent | 8027678202d0e51ac2aa08111ec86b5a77777431 (diff) | |
| parent | 0699a73af3811b66b1ab5650575acee5eea841ab (diff) | |
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
| -rw-r--r-- | drivers/firewire/core-cdev.c | 3 | ||||
| -rw-r--r-- | drivers/firewire/ohci.c | 10 | ||||
| -rw-r--r-- | include/linux/firewire.h | 1 | ||||
| -rw-r--r-- | include/uapi/linux/firewire-cdev.h | 4 |
4 files changed, 14 insertions, 4 deletions
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); diff --git a/include/linux/firewire.h b/include/linux/firewire.h index 3b0e820375ab..5d7782e42b8f 100644 --- a/include/linux/firewire.h +++ b/include/linux/firewire.h @@ -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; diff --git a/include/uapi/linux/firewire-cdev.h b/include/uapi/linux/firewire-cdev.h index d50036953497..1db453e4b550 100644 --- a/include/uapi/linux/firewire-cdev.h +++ b/include/uapi/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): * |