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 <stefanr@s5r6.in-berlin.de>

diff --git a/drivers/ieee1394/csr1212.c b/drivers/ieee1394/csr1212.c
index 43f5b7f..d08166b 100644 (file)
--- a/drivers/ieee1394/csr1212.c
+++ b/drivers/ieee1394/csr1212.c
@@ -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: