commit 0f3f1f302fd2021a5ce6cb170321d0a0d35bdec5
author Cornelia Huck <cornelia.huck@de.ibm.com> Fri Apr 26 02:12:54 2013 +0000
committer Alexander Graf <agraf@suse.de> Fri Apr 26 20:18:24 2013 +0200
tree 83b685a4b806d59e6124de682e718359f7801882
parent 776e7f0f215dd11dde85277723408fae3d319143

s390-ccw.img: Rudimentary error checking.

Try to handle at least some of the errors that may happen.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>

pc-bios/s390-ccw/virtio.c

diff --git a/pc-bios/s390-ccw/virtio.c b/pc-bios/s390-ccw/virtio.c
index 1bd17d4..e0cede5 100644
--- a/pc-bios/s390-ccw/virtio.c
+++ b/pc-bios/s390-ccw/virtio.c
@@ -84,7 +84,9 @@
      *     assume that a simple tsch will have finished the CCW processing,
      *     but the architecture allows for asynchronous operation
      */
-    drain_irqs(schid);
+    if (!r) {
+        r = drain_irqs(schid);
+    }
     return r;
 }
 
@@ -92,7 +94,9 @@
                               unsigned long dev_addr)
 {
     unsigned char status = dev_addr;
-    run_ccw(schid, CCW_CMD_WRITE_STATUS, &status, sizeof(status));
+    if (run_ccw(schid, CCW_CMD_WRITE_STATUS, &status, sizeof(status))) {
+        virtio_panic("Could not write status to host!\n");
+    }
 }
 
 static void virtio_reset(struct subchannel_id schid)
@@ -193,6 +197,7 @@
 {
     struct virtio_blk_outhdr out_hdr;
     u8 status;
+    int r;
 
     /* Tell the host we want to read */
     out_hdr.type = VIRTIO_BLK_T_IN;
@@ -213,8 +218,11 @@
     /* Now we can tell the host to read */
     vring_wait_reply(&block, 0);
 
-    drain_irqs(block.schid);
-
+    r = drain_irqs(block.schid);
+    if (r) {
+        /* Well, whatever status is supposed to contain... */
+        status = 1;
+    }
     return status;
 }
 
@@ -262,8 +270,9 @@
     info.num = 128;
     block.schid = schid;
 
-    run_ccw(schid, CCW_CMD_SET_VQ, &info, sizeof(info));
-    virtio_set_status(schid, VIRTIO_CONFIG_S_DRIVER_OK);
+    if (!run_ccw(schid, CCW_CMD_SET_VQ, &info, sizeof(info))) {
+        virtio_set_status(schid, VIRTIO_CONFIG_S_DRIVER_OK);
+    }
 }
 
 bool virtio_is_blk(struct subchannel_id schid)