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authorClemens Ladisch <clemens@ladisch.de>2012-03-18 19:04:05 +0100
committerStefan Richter <stefanr@s5r6.in-berlin.de>2012-03-18 22:15:38 +0100
commit73864012f386ca5a193f3231c9b1936e23709a94 (patch)
tree0278de90e03579c0bac789173b97faaf13112d2e /drivers/firewire
parent90fcc8987390bffd79c6fd16aa59cc6ef549efcb (diff)
downloadop-kernel-dev-73864012f386ca5a193f3231c9b1936e23709a94.zip
op-kernel-dev-73864012f386ca5a193f3231c9b1936e23709a94.tar.gz
firewire: ohci: simplify iso header pointer arithmetic
When storing the header data of completed iso packets, we effectively treat the buffers as arrays of quadlets. Actually declaring the pointers as u32* avoids repetitive pointer arithmetic, removes the unhelpfully named "i" variables, and thus makes the code clearer. 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/ohci.c22
1 files changed, 12 insertions, 10 deletions
diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c
index a2fc64c..1a497433 100644
--- a/drivers/firewire/ohci.c
+++ b/drivers/firewire/ohci.c
@@ -2676,24 +2676,26 @@ static void ohci_write_csr(struct fw_card *card, int csr_offset, u32 value)
}
}
-static void copy_iso_headers(struct iso_context *ctx, void *p)
+static void copy_iso_headers(struct iso_context *ctx, const u32 *dma_hdr)
{
- int i = ctx->header_length;
+ u32 *ctx_hdr;
- if (i + ctx->base.header_size > PAGE_SIZE)
+ if (ctx->header_length + ctx->base.header_size > PAGE_SIZE)
return;
+ ctx_hdr = ctx->header + ctx->header_length;
+
/*
* The two iso header quadlets are byteswapped to little
* endian by the controller, but we want to present them
* as big endian for consistency with the bus endianness.
*/
if (ctx->base.header_size > 0)
- *(u32 *) (ctx->header + i) = __swab32(*(u32 *) (p + 4));
+ ctx_hdr[0] = swab32(dma_hdr[1]); /* iso packet header */
if (ctx->base.header_size > 4)
- *(u32 *) (ctx->header + i + 4) = __swab32(*(u32 *) p);
+ ctx_hdr[1] = swab32(dma_hdr[0]); /* timestamp */
if (ctx->base.header_size > 8)
- memcpy(ctx->header + i + 8, p + 8, ctx->base.header_size - 8);
+ memcpy(&ctx_hdr[2], &dma_hdr[2], ctx->base.header_size - 8);
ctx->header_length += ctx->base.header_size;
}
@@ -2812,8 +2814,8 @@ static int handle_it_packet(struct context *context,
{
struct iso_context *ctx =
container_of(context, struct iso_context, context);
- int i;
struct descriptor *pd;
+ __be32 *ctx_hdr;
for (pd = d; pd <= last; pd++)
if (pd->transfer_status)
@@ -2824,10 +2826,10 @@ static int handle_it_packet(struct context *context,
sync_it_packet_for_cpu(context, d);
- i = ctx->header_length;
- if (i + 4 < PAGE_SIZE) {
+ 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 */
- *(__be32 *)(ctx->header + i) = cpu_to_be32(
+ *ctx_hdr = cpu_to_be32(
((u32)le16_to_cpu(pd->transfer_status) << 16) |
le16_to_cpu(pd->res_count));
ctx->header_length += 4;
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