aboutsummaryrefslogtreecommitdiff
path: root/drivers/firewire
diff options
context:
space:
mode:
authorClemens Ladisch <clemens@ladisch.de>2012-03-18 19:05:29 +0100
committerStefan Richter <stefanr@s5r6.in-berlin.de>2012-03-18 22:15:39 +0100
commit18d627113b830cda80792e96b28341bcd41cf40c (patch)
tree44281ec110668e9f7a583303b28ba2ca47012a20 /drivers/firewire
parent910e76c607546ead218de8b11c32597d6b8fe7e4 (diff)
downloadlinaro-lsk-18d627113b830cda80792e96b28341bcd41cf40c.tar.gz
firewire: prevent dropping of completed iso packet header data
The buffer for the header data of completed iso packets has a fixed size, so it is possible to configure a stream with a big interval between interrupt packets or with big headers so that this buffer would overflow. Previously, ohci.c would drop any data that would not fit, but this could make unsuspecting applications believe that fewer than the actual number of packets have completed. Instead of dropping data, add calls to flush_iso_completion() so that there are as many events as needed to report all of the data. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'drivers/firewire')
-rw-r--r--drivers/firewire/core-cdev.c2
-rw-r--r--drivers/firewire/ohci.c18
2 files changed, 10 insertions, 10 deletions
diff --git a/drivers/firewire/core-cdev.c b/drivers/firewire/core-cdev.c
index f5f5a9706fc..4cb27dc542c 100644
--- a/drivers/firewire/core-cdev.c
+++ b/drivers/firewire/core-cdev.c
@@ -51,7 +51,7 @@
/*
* ABI version history is documented in linux/firewire-cdev.h.
*/
-#define FW_CDEV_KERNEL_VERSION 4
+#define FW_CDEV_KERNEL_VERSION 5
#define FW_CDEV_VERSION_EVENT_REQUEST2 4
#define FW_CDEV_VERSION_ALLOCATE_REGION_END 4
diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c
index 07d3c8d58b3..632562667a0 100644
--- a/drivers/firewire/ohci.c
+++ b/drivers/firewire/ohci.c
@@ -2689,7 +2689,7 @@ 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)
- return;
+ flush_iso_completions(ctx);
ctx_hdr = ctx->header + ctx->header_length;
ctx->last_timestamp = (u16)le32_to_cpu((__force __le32)dma_hdr[0]);
@@ -2826,16 +2826,16 @@ static int handle_it_packet(struct context *context,
sync_it_packet_for_cpu(context, d);
- if (ctx->header_length + 4 < PAGE_SIZE) {
- ctx_hdr = ctx->header + ctx->header_length;
- /* Present this value as big-endian to match the receive code */
- *ctx_hdr = cpu_to_be32(
- ((u32)le16_to_cpu(pd->transfer_status) << 16) |
- le16_to_cpu(pd->res_count));
- ctx->header_length += 4;
- }
+ if (ctx->header_length + 4 > PAGE_SIZE)
+ flush_iso_completions(ctx);
+ ctx_hdr = ctx->header + ctx->header_length;
ctx->last_timestamp = le16_to_cpu(last->res_count);
+ /* Present this value as big-endian to match the receive code */
+ *ctx_hdr = cpu_to_be32((le16_to_cpu(pd->transfer_status) << 16) |
+ le16_to_cpu(pd->res_count));
+ ctx->header_length += 4;
+
if (last->control & cpu_to_le16(DESCRIPTOR_IRQ_ALWAYS))
flush_iso_completions(ctx);