From d265250341f83fa904d4fecdfadb46d7ab50765f Mon Sep 17 00:00:00 2001 From: Stefan Richter Date: Wed, 14 Mar 2007 00:29:20 +0100 Subject: [PATCH] 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: Stefan Richter --- drivers/ieee1394/csr1212.c | 27 +++++++++------------------ 1 file changed, 9 insertions(+), 18 deletions(-) diff --git a/drivers/ieee1394/csr1212.c b/drivers/ieee1394/csr1212.c index 43f5b7f814ae..d08166bda1c5 100644 --- a/drivers/ieee1394/csr1212.c +++ b/drivers/ieee1394/csr1212.c @@ -34,6 +34,7 @@ */ #include +#include #include #include #include @@ -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: -- 2.20.1