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firewire: prevent dropping of completed iso packet header data

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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>
This commit is contained in:
Clemens Ladisch 2012-03-18 19:05:29 +01:00 • committed by Stefan Richter
parent 910e76c607
commit 18d627113b
3 changed files with 17 additions and 12 deletions
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18
drivers/firewire/ohci.c
View file

@ -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);