ide: add IDE_HFLAG_4DRIVES host flag

Add IDE_HFLAG_4DRIVES host flag and use it instead of ide_4drives
chipset type in ide_init_port().

There should be no functional changes caused by this patch.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

3 files changed, 6 insertions, 3 deletions

diff --git a/drivers/ide/ide-4drives.c b/drivers/ide/ide-4drives.c
index 9e85b1ec9607..78aca75a2c48 100644
--- a/drivers/ide/ide-4drives.c
+++ b/drivers/ide/ide-4drives.c
@@ -23,7 +23,8 @@ static const struct ide_port_ops ide_4drives_port_ops = {
 
 static const struct ide_port_info ide_4drives_port_info = {
         .port_ops               = &ide_4drives_port_ops,
-        .host_flags             = IDE_HFLAG_SERIALIZE | IDE_HFLAG_NO_DMA,
+        .host_flags             = IDE_HFLAG_SERIALIZE | IDE_HFLAG_NO_DMA |
+                                  IDE_HFLAG_4DRIVES,
 };
 
 static int __init ide_4drives_init(void)
diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
index 62270f474681..335322f40c5a 100644
--- a/drivers/ide/ide-probe.c
+++ b/drivers/ide/ide-probe.c
@@ -1381,8 +1381,8 @@ int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
                 if (ide_probe_port(hwif) == 0)
                         hwif->present = 1;
 
-                if (hwif->chipset != ide_4drives || !hwif->mate ||
-                    !hwif->mate->present) {
+                if ((hwif->host_flags & IDE_HFLAG_4DRIVES) == 0 ||
+                    hwif->mate == NULL || hwif->mate->present == 0) {
                         if (ide_register_port(hwif)) {
                                 ide_disable_port(hwif);
                                 continue;
diff --git a/include/linux/ide.h b/include/linux/ide.h
index 732a05f3de08..3d4ba8e95d4a 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -1327,6 +1327,8 @@ enum {
         IDE_HFLAG_SERIALIZE             = (1 << 20),
         /* host is DTC2278 */
         IDE_HFLAG_DTC2278               = (1 << 21),
+        /* 4 devices on a single set of I/O ports */
+        IDE_HFLAG_4DRIVES               = (1 << 22),
         /* host is TRM290 */
         IDE_HFLAG_TRM290                = (1 << 23),
         /* use 32-bit I/O ops */