9p/trans_virtio: discard zero-length reply

[pandora-kernel.git] / net / 9p / trans_virtio.c

diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c
index 32aa983..a107265 100644 (file)
--- a/net/9p/trans_virtio.c
+++ b/net/9p/trans_virtio.c
@@ -37,6 +37,7 @@
 #include <linux/inet.h>
 #include <linux/idr.h>
 #include <linux/file.h>
+#include <linux/highmem.h>
 #include <linux/slab.h>
 #include <net/9p/9p.h>
 #include <linux/parser.h>
@@ -162,7 +163,8 @@ static void req_done(struct virtqueue *vq)
                P9_DPRINTK(P9_DEBUG_TRANS, ": lookup tag %d\n", rc->tag);
                req = p9_tag_lookup(chan->client, rc->tag);
                req->status = REQ_STATUS_RCVD;
-               p9_client_cb(chan->client, req);
+               if (len)
+                       p9_client_cb(chan->client, req);
        }
 }
 
@@ -275,8 +277,8 @@ req_retry:
                if (err == -ENOSPC) {
                        chan->ring_bufs_avail = 0;
                        spin_unlock_irqrestore(&chan->lock, flags);
-                       err = wait_event_interruptible(*chan->vc_wq,
-                                                       chan->ring_bufs_avail);
+                       err = wait_event_killable(*chan->vc_wq,
+                                                 chan->ring_bufs_avail);
                        if (err  == -ERESTARTSYS)
                                return err;
 
@@ -308,7 +310,7 @@ static int p9_get_mapped_pages(struct virtio_chan *chan,
                 * Other zc request to finish here
                 */
                if (atomic_read(&vp_pinned) >= chan->p9_max_pages) {
-                       err = wait_event_interruptible(vp_wq,
+                       err = wait_event_killable(vp_wq,
                              (atomic_read(&vp_pinned) < chan->p9_max_pages));
                        if (err == -ERESTARTSYS)
                                return err;
@@ -323,7 +325,7 @@ static int p9_get_mapped_pages(struct virtio_chan *chan,
                int count = nr_pages;
                while (nr_pages) {
                        s = rest_of_page(data);
-                       pages[index++] = virt_to_page(data);
+                       pages[index++] = kmap_to_page(data);
                        data += s;
                        nr_pages--;
                }
@@ -418,8 +420,8 @@ req_retry_pinned:
                if (err == -ENOSPC) {
                        chan->ring_bufs_avail = 0;
                        spin_unlock_irqrestore(&chan->lock, flags);
-                       err = wait_event_interruptible(*chan->vc_wq,
-                                                      chan->ring_bufs_avail);
+                       err = wait_event_killable(*chan->vc_wq,
+                                                 chan->ring_bufs_avail);
                        if (err  == -ERESTARTSYS)
                                goto err_out;
 
@@ -437,8 +439,7 @@ req_retry_pinned:
        virtqueue_kick(chan->vq);
        spin_unlock_irqrestore(&chan->lock, flags);
        P9_DPRINTK(P9_DEBUG_TRANS, "9p debug: virtio request kicked\n");
-       err = wait_event_interruptible(*req->wq,
-                                      req->status >= REQ_STATUS_RCVD);
+       err = wait_event_killable(*req->wq, req->status >= REQ_STATUS_RCVD);
        /*
         * Non kernel buffers are pinned, unpin them
         */