s390-bios: Extend find_dev() for non-virtio devices

We need a method for finding the subchannel of a dasd device. Let's
modify find_dev to handle this since it mostly does what we need. Up to
this point find_dev has been specific to only virtio devices.

Signed-off-by: Jason J. Herne <jjherne@linux.ibm.com>
Acked-by: Halil Pasic <pasic@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Message-Id: <1554388475-18329-11-git-send-email-jjherne@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

1 files changed, 11 insertions, 5 deletions

diff --git a/pc-bios/s390-ccw/main.c b/pc-bios/s390-ccw/main.c
index e403b5f733..d04ea8972a 100644
--- a/pc-bios/s390-ccw/main.c
+++ b/pc-bios/s390-ccw/main.c
@@ -52,6 +52,12 @@ unsigned int get_loadparm_index(void)
     return atoui(loadparm_str);
 }
 
+/*
+ * Find the subchannel connected to the given device (dev_no) and fill in the
+ * subchannel information block (schib) with the connected subchannel's info.
+ * NOTE: The global variable blk_schid is updated to contain the subchannel
+ * information.
+ */
 static bool find_dev(Schib *schib, int dev_no)
 {
     int i, r;
@@ -65,15 +71,15 @@ static bool find_dev(Schib *schib, int dev_no)
         if (!schib->pmcw.dnv) {
             continue;
         }
-        if (!virtio_is_supported(blk_schid)) {
-            continue;
-        }
+
         /* Skip net devices since no IPLB is created and therefore no
-         * no network bootloader has been loaded
+         * network bootloader has been loaded
          */
-        if (virtio_get_device_type() == VIRTIO_ID_NET && dev_no < 0) {
+        if (virtio_is_supported(blk_schid) &&
+            virtio_get_device_type() == VIRTIO_ID_NET && dev_no < 0) {
             continue;
         }
+
         if ((dev_no < 0) || (schib->pmcw.dev == dev_no)) {
             return true;
         }