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Commit d2652503 authored by Stefan Richter's avatar Stefan Richter
Browse files

ieee1394: csr1212: log if devices have CRC errors in their ROM 



This will point out firmware bugs.

I tested with 11 SBP-2 devices and one OS X PC and got these errors from
two old CD-RWs only.

Signed-off-by: default avatarStefan Richter <stefanr@s5r6.in-berlin.de>
parent 511f7b32

drivers/ieee1394/csr1212.c

+9 −18
Original line number Diff line number Diff line
@@ -34,6 +34,7 @@ 
 */



#include <linux/errno.h>

#include <linux/kernel.h>

#include <linux/string.h>

#include <asm/bug.h>

#include <asm/byteorder.h>
@@ -113,10 +114,7 @@ static u16 csr1212_crc16(const u32 *buffer, size_t length) 
	return cpu_to_be16(crc);

}



#if 0

/* Microsoft computes the CRC with the bytes in reverse order.  Therefore we

 * have a special version of the CRC algorithm to account for their buggy

 * software. */

/* Microsoft computes the CRC with the bytes in reverse order. */

static u16 csr1212_msft_crc16(const u32 *buffer, size_t length)

{

	int shift;
@@ -135,7 +133,6 @@ static u16 csr1212_msft_crc16(const u32 *buffer, size_t length) 


	return cpu_to_be16(crc);

}

#endif



static struct csr1212_dentry *

csr1212_find_keyval(struct csr1212_keyval *dir, struct csr1212_keyval *kv)
@@ -1096,13 +1093,11 @@ static int csr1212_parse_bus_info_block(struct csr1212_csr *csr) 
			return ret;

	}



#if 0

	/* Apparently there are too many differnt wrong implementations of the

	 * CRC algorithm that verifying them is moot. */

	/* Apparently there are many different wrong implementations of the CRC

	 * algorithm.  We don't fail, we just warn. */

	if ((csr1212_crc16(bi->data, bi->crc_length) != bi->crc) &&

	    (csr1212_msft_crc16(bi->data, bi->crc_length) != bi->crc))

		return -EINVAL;

#endif

		printk(KERN_DEBUG "IEEE 1394 device has ROM CRC error\n");



	cr = CSR1212_MALLOC(sizeof(*cr));

	if (!cr)
@@ -1207,15 +1202,11 @@ int csr1212_parse_keyval(struct csr1212_keyval *kv, 
		&cache->data[bytes_to_quads(kv->offset - cache->offset)];

	kvi_len = be16_to_cpu(kvi->length);



#if 0

	/* Apparently there are too many differnt wrong implementations of the

	 * CRC algorithm that verifying them is moot. */

	/* Apparently there are many different wrong implementations of the CRC

	 * algorithm.  We don't fail, we just warn. */

	if ((csr1212_crc16(kvi->data, kvi_len) != kvi->crc) &&

	    (csr1212_msft_crc16(kvi->data, kvi_len) != kvi->crc)) {

		ret = -EINVAL;

		goto out;

	}

#endif

	    (csr1212_msft_crc16(kvi->data, kvi_len) != kvi->crc))

		printk(KERN_DEBUG "IEEE 1394 device has ROM CRC error\n");



	switch (kv->key.type) {

	case CSR1212_KV_TYPE_DIRECTORY: