Merge tag 'stable/for-linus-3.4-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel...
authorLinus Torvalds <torvalds@linux-foundation.org>
Fri, 20 Apr 2012 18:31:00 +0000 (11:31 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 20 Apr 2012 18:31:00 +0000 (11:31 -0700)
Pull xen fixes from Konrad Rzeszutek Wilk:
 - mechanism to work with misconfigured backends (where they are
   advertised but in reality don't exist).
 - two tiny compile warning fixes.
 - proper error handling in gnttab_resume
 - Not using VM_PFNMAP anymore to allow backends in the same domain.

* tag 'stable/for-linus-3.4-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen:
  Revert "xen/p2m: m2p_find_override: use list_for_each_entry_safe"
  xen/resume: Fix compile warnings.
  xen/xenbus: Add quirk to deal with misconfigured backends.
  xen/blkback: Fix warning error.
  xen/p2m: m2p_find_override: use list_for_each_entry_safe
  xen/gntdev: do not set VM_PFNMAP
  xen/grant-table: add error-handling code on failure of gnttab_resume

drivers/block/xen-blkback/xenbus.c
drivers/xen/gntdev.c
drivers/xen/grant-table.c
drivers/xen/manage.c
drivers/xen/xenbus/xenbus_probe_frontend.c

index 89860f3..4f66171 100644 (file)
@@ -416,7 +416,7 @@ static void xen_blkbk_discard(struct xenbus_transaction xbt, struct backend_info
                                    "discard-secure", "%d",
                                    blkif->vbd.discard_secure);
                if (err) {
-                       dev_warn(dev-dev, "writing discard-secure (%d)", err);
+                       dev_warn(&dev->dev, "writing discard-secure (%d)", err);
                        return;
                }
        }
index 99d8151..1ffd03b 100644 (file)
@@ -722,7 +722,7 @@ static int gntdev_mmap(struct file *flip, struct vm_area_struct *vma)
        vma->vm_flags |= VM_RESERVED|VM_DONTEXPAND;
 
        if (use_ptemod)
-               vma->vm_flags |= VM_DONTCOPY|VM_PFNMAP;
+               vma->vm_flags |= VM_DONTCOPY;
 
        vma->vm_private_data = map;
 
index b4d4eac..f100ce2 100644 (file)
@@ -1029,6 +1029,7 @@ int gnttab_init(void)
        int i;
        unsigned int max_nr_glist_frames, nr_glist_frames;
        unsigned int nr_init_grefs;
+       int ret;
 
        nr_grant_frames = 1;
        boot_max_nr_grant_frames = __max_nr_grant_frames();
@@ -1047,12 +1048,16 @@ int gnttab_init(void)
        nr_glist_frames = (nr_grant_frames * GREFS_PER_GRANT_FRAME + RPP - 1) / RPP;
        for (i = 0; i < nr_glist_frames; i++) {
                gnttab_list[i] = (grant_ref_t *)__get_free_page(GFP_KERNEL);
-               if (gnttab_list[i] == NULL)
+               if (gnttab_list[i] == NULL) {
+                       ret = -ENOMEM;
                        goto ini_nomem;
+               }
        }
 
-       if (gnttab_resume() < 0)
-               return -ENODEV;
+       if (gnttab_resume() < 0) {
+               ret = -ENODEV;
+               goto ini_nomem;
+       }
 
        nr_init_grefs = nr_grant_frames * GREFS_PER_GRANT_FRAME;
 
@@ -1070,7 +1075,7 @@ int gnttab_init(void)
        for (i--; i >= 0; i--)
                free_page((unsigned long)gnttab_list[i]);
        kfree(gnttab_list);
-       return -ENOMEM;
+       return ret;
 }
 EXPORT_SYMBOL_GPL(gnttab_init);
 
index 9e14ae6..412b96c 100644 (file)
@@ -132,6 +132,7 @@ static void do_suspend(void)
        err = dpm_suspend_end(PMSG_FREEZE);
        if (err) {
                printk(KERN_ERR "dpm_suspend_end failed: %d\n", err);
+               si.cancelled = 0;
                goto out_resume;
        }
 
index f20c5f1..a31b54d 100644 (file)
@@ -135,7 +135,7 @@ static int read_backend_details(struct xenbus_device *xendev)
        return xenbus_read_otherend_details(xendev, "backend-id", "backend");
 }
 
-static int is_device_connecting(struct device *dev, void *data)
+static int is_device_connecting(struct device *dev, void *data, bool ignore_nonessential)
 {
        struct xenbus_device *xendev = to_xenbus_device(dev);
        struct device_driver *drv = data;
@@ -152,16 +152,41 @@ static int is_device_connecting(struct device *dev, void *data)
        if (drv && (dev->driver != drv))
                return 0;
 
+       if (ignore_nonessential) {
+               /* With older QEMU, for PVonHVM guests the guest config files
+                * could contain: vfb = [ 'vnc=1, vnclisten=0.0.0.0']
+                * which is nonsensical as there is no PV FB (there can be
+                * a PVKB) running as HVM guest. */
+
+               if ((strncmp(xendev->nodename, "device/vkbd", 11) == 0))
+                       return 0;
+
+               if ((strncmp(xendev->nodename, "device/vfb", 10) == 0))
+                       return 0;
+       }
        xendrv = to_xenbus_driver(dev->driver);
        return (xendev->state < XenbusStateConnected ||
                (xendev->state == XenbusStateConnected &&
                 xendrv->is_ready && !xendrv->is_ready(xendev)));
 }
+static int essential_device_connecting(struct device *dev, void *data)
+{
+       return is_device_connecting(dev, data, true /* ignore PV[KBB+FB] */);
+}
+static int non_essential_device_connecting(struct device *dev, void *data)
+{
+       return is_device_connecting(dev, data, false);
+}
 
-static int exists_connecting_device(struct device_driver *drv)
+static int exists_essential_connecting_device(struct device_driver *drv)
 {
        return bus_for_each_dev(&xenbus_frontend.bus, NULL, drv,
-                               is_device_connecting);
+                               essential_device_connecting);
+}
+static int exists_non_essential_connecting_device(struct device_driver *drv)
+{
+       return bus_for_each_dev(&xenbus_frontend.bus, NULL, drv,
+                               non_essential_device_connecting);
 }
 
 static int print_device_status(struct device *dev, void *data)
@@ -192,6 +217,23 @@ static int print_device_status(struct device *dev, void *data)
 /* We only wait for device setup after most initcalls have run. */
 static int ready_to_wait_for_devices;
 
+static bool wait_loop(unsigned long start, unsigned int max_delay,
+                    unsigned int *seconds_waited)
+{
+       if (time_after(jiffies, start + (*seconds_waited+5)*HZ)) {
+               if (!*seconds_waited)
+                       printk(KERN_WARNING "XENBUS: Waiting for "
+                              "devices to initialise: ");
+               *seconds_waited += 5;
+               printk("%us...", max_delay - *seconds_waited);
+               if (*seconds_waited == max_delay)
+                       return true;
+       }
+
+       schedule_timeout_interruptible(HZ/10);
+
+       return false;
+}
 /*
  * On a 5-minute timeout, wait for all devices currently configured.  We need
  * to do this to guarantee that the filesystems and / or network devices
@@ -215,19 +257,14 @@ static void wait_for_devices(struct xenbus_driver *xendrv)
        if (!ready_to_wait_for_devices || !xen_domain())
                return;
 
-       while (exists_connecting_device(drv)) {
-               if (time_after(jiffies, start + (seconds_waited+5)*HZ)) {
-                       if (!seconds_waited)
-                               printk(KERN_WARNING "XENBUS: Waiting for "
-                                      "devices to initialise: ");
-                       seconds_waited += 5;
-                       printk("%us...", 300 - seconds_waited);
-                       if (seconds_waited == 300)
-                               break;
-               }
-
-               schedule_timeout_interruptible(HZ/10);
-       }
+       while (exists_non_essential_connecting_device(drv))
+               if (wait_loop(start, 30, &seconds_waited))
+                       break;
+
+       /* Skips PVKB and PVFB check.*/
+       while (exists_essential_connecting_device(drv))
+               if (wait_loop(start, 270, &seconds_waited))
+                       break;
 
        if (seconds_waited)
                printk("\n");