ieee1394: sbp2: use a better wildcard for blacklist

0x000000 could be a valid value to match against, but anything bigger
than 0xffffff cannot.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

drivers/ieee1394/sbp2.c

@@ -308,6 +308,8 @@ static struct scsi_host_template sbp2_shost_template = {
 	.sdev_attrs		 = sbp2_sysfs_sdev_attrs,
 };
 
+/* for match-all entries in sbp2_workarounds_table */
+#define SBP2_ROM_VALUE_WILDCARD 0x1000000
 
 /*
  * List of devices with known bugs.
@@ -329,22 +331,14 @@ static const struct {
 	},
 	/* Initio bridges, actually only needed for some older ones */ {
 		.firmware_revision	= 0x000200,
+		.model_id		= SBP2_ROM_VALUE_WILDCARD,
 		.workarounds		= SBP2_WORKAROUND_INQUIRY_36,
 	},
 	/* Symbios bridge */ {
 		.firmware_revision	= 0xa0b800,
+		.model_id		= SBP2_ROM_VALUE_WILDCARD,
 		.workarounds		= SBP2_WORKAROUND_128K_MAX_TRANS,
 	},
-	/*
-	 * Note about the following Apple iPod blacklist entries:
-	 *
-	 * There are iPods (2nd gen, 3rd gen) with model_id==0.  Since our
-	 * matching logic treats 0 as a wildcard, we cannot match this ID
-	 * without rewriting the matching routine.  Fortunately these iPods
-	 * do not feature the read_capacity bug according to one report.
-	 * Read_capacity behaviour as well as model_id could change due to
-	 * Apple-supplied firmware updates though.
-	 */
 	/* iPod 4th generation */ {
 		.firmware_revision	= 0x0a2700,
 		.model_id		= 0x000021,
@@ -1307,11 +1301,13 @@ static void sbp2_parse_unit_directory(struct sbp2_lu *lu,
 
 	if (!(workarounds & SBP2_WORKAROUND_OVERRIDE))
 		for (i = 0; i < ARRAY_SIZE(sbp2_workarounds_table); i++) {
-			if (sbp2_workarounds_table[i].firmware_revision &&
+			if (sbp2_workarounds_table[i].firmware_revision !=
+			    SBP2_ROM_VALUE_WILDCARD &&
 			    sbp2_workarounds_table[i].firmware_revision !=
 			    (firmware_revision & 0xffff00))
 				continue;
-			if (sbp2_workarounds_table[i].model_id &&
+			if (sbp2_workarounds_table[i].model_id !=
+			    SBP2_ROM_VALUE_WILDCARD &&
 			    sbp2_workarounds_table[i].model_id != ud->model_id)
 				continue;
 			workarounds |= sbp2_workarounds_table[i].workarounds;