firewire: core: optimize Topology Map creation
The Topology Map of the local node was created in CPU byte order,
then a temporary big endian copy was created to compute the CRC,
and when a read request to the Topology Map arrived it had to be
converted to big endian byte order again.
We now generate it in big endian byte order in the first place.
This also rids us of 1000 bytes stack usage in tasklet context.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
diff --git a/drivers/firewire/core-card.c b/drivers/firewire/core-card.c
index f581307..7083bcc 100644
--- a/drivers/firewire/core-card.c
+++ b/drivers/firewire/core-card.c
@@ -38,7 +38,7 @@
#include "core.h"
-static int __compute_block_crc(__be32 *block)
+int fw_compute_block_crc(__be32 *block)
{
int length;
u16 crc;
@@ -50,19 +50,6 @@
return length;
}
-int fw_compute_block_crc(u32 *block)
-{
- __be32 be32_block[256];
- int i, length;
-
- length = (*block >> 16) & 0xff;
- for (i = 0; i < length; i++)
- be32_block[i] = cpu_to_be32(block[i + 1]);
- *block |= crc_itu_t(0, (u8 *) be32_block, length * 4);
-
- return length;
-}
-
static DEFINE_MUTEX(card_mutex);
static LIST_HEAD(card_list);
@@ -141,7 +128,7 @@
* the bus info block, which is always the case for this
* implementation. */
for (i = 0; i < j; i += length + 1)
- length = __compute_block_crc(config_rom + i);
+ length = fw_compute_block_crc(config_rom + i);
return j;
}