Merge android-4.4.155 (b3f777e) into msm-4.4

* refs/heads/tmp-b3f777e
  Linux 4.4.155
  drm/drivers: add support for using the arch wc mapping API.
  x86/io: add interface to reserve io memtype for a resource range. (v1.1)
  fs/quota: Fix spectre gadget in do_quotactl
  perf auxtrace: Fix queue resize
  bcache: release dc->writeback_lock properly in bch_writeback_thread()
  getxattr: use correct xattr length
  udlfb: set optimal write delay
  fb: fix lost console when the user unplugs a USB adapter
  pwm: tiehrpwm: Fix disabling of output of PWMs
  ubifs: Fix synced_i_size calculation for xattr inodes
  ubifs: Check data node size before truncate
  Revert "UBIFS: Fix potential integer overflow in allocation"
  ubifs: Fix memory leak in lprobs self-check
  userns: move user access out of the mutex
  sys: don't hold uts_sem while accessing userspace memory
  osf_getdomainname(): use copy_to_user()
  iommu/vt-d: Fix dev iotlb pfsid use
  iommu/vt-d: Add definitions for PFSID
  mm/tlb: Remove tlb_remove_table() non-concurrent condition
  ARM: tegra: Fix Tegra30 Cardhu PCA954x reset
  pnfs/blocklayout: off by one in bl_map_stripe()
  PM / sleep: wakeup: Fix build error caused by missing SRCU support
  9p: fix multiple NULL-pointer-dereferences
  uprobes: Use synchronize_rcu() not synchronize_sched()
  kthread, tracing: Don't expose half-written comm when creating kthreads
  tracing/blktrace: Fix to allow setting same value
  tracing: Do not call start/stop() functions when tracing_on does not change
  vmw_balloon: fix VMCI use when balloon built into kernel
  vmw_balloon: VMCI_DOORBELL_SET does not check status
  vmw_balloon: do not use 2MB without batching
  vmw_balloon: fix inflation of 64-bit GFNs
  iio: ad9523: Fix return value for ad952x_store()
  iio: ad9523: Fix displayed phase
  dm cache metadata: save in-core policy_hint_size to on-disk superblock
  x86/mm/pat: Fix L1TF stable backport for CPA, 2nd call
  net/9p/trans_fd.c: fix race-condition by flushing workqueue before the kfree()
  net/9p/client.c: version pointer uninitialized
  9p/virtio: fix off-by-one error in sg list bounds check
  fs/9p/xattr.c: catch the error of p9_client_clunk when setting xattr failed
  powerpc/pseries: Fix endianness while restoring of r3 in MCE handler.
  powerpc/fadump: handle crash memory ranges array index overflow
  drm/i915/userptr: reject zero user_size
  spi: davinci: fix a NULL pointer dereference
  net: lan78xx: Fix misplaced tasklet_schedule() call
  9p/net: Fix zero-copy path in the 9p virtio transport
  net: mac802154: tx: expand tailroom if necessary
  net: 6lowpan: fix reserved space for single frames
  BACKPORT: arm64/vdso: Fix nsec handling for CLOCK_MONOTONIC_RAW
  ANDROID: arm64: mm: fix 4.4.154 merge

Change-Id: Id5969245c97b88f9618cb6123e992ea4540ca434
Signed-off-by: Srinivasarao P <spathi@codeaurora.org>

1 files changed, 41 insertions, 26 deletions

diff --git a/drivers/misc/vmw_balloon.c b/drivers/misc/vmw_balloon.c
index 5e047bfc0cc4..518e2dec2aa2 100644
--- a/drivers/misc/vmw_balloon.c
+++ b/drivers/misc/vmw_balloon.c
@@ -341,7 +341,13 @@ static bool vmballoon_send_start(struct vmballoon *b, unsigned long req_caps)
 		success = false;
 	}
 
-	if (b->capabilities & VMW_BALLOON_BATCHED_2M_CMDS)
+	/*
+	 * 2MB pages are only supported with batching. If batching is for some
+	 * reason disabled, do not use 2MB pages, since otherwise the legacy
+	 * mechanism is used with 2MB pages, causing a failure.
+	 */
+	if ((b->capabilities & VMW_BALLOON_BATCHED_2M_CMDS) &&
+	    (b->capabilities & VMW_BALLOON_BATCHED_CMDS))
 		b->supported_page_sizes = 2;
 	else
 		b->supported_page_sizes = 1;
@@ -450,7 +456,7 @@ static int vmballoon_send_lock_page(struct vmballoon *b, unsigned long pfn,
 
 	pfn32 = (u32)pfn;
 	if (pfn32 != pfn)
-		return -1;
+		return -EINVAL;
 
 	STATS_INC(b->stats.lock[false]);
 
@@ -460,7 +466,7 @@ static int vmballoon_send_lock_page(struct vmballoon *b, unsigned long pfn,
 
 	pr_debug("%s - ppn %lx, hv returns %ld\n", __func__, pfn, status);
 	STATS_INC(b->stats.lock_fail[false]);
-	return 1;
+	return -EIO;
 }
 
 static int vmballoon_send_batched_lock(struct vmballoon *b,
@@ -597,11 +603,12 @@ static int vmballoon_lock_page(struct vmballoon *b, unsigned int num_pages,
 
 	locked = vmballoon_send_lock_page(b, page_to_pfn(page), &hv_status,
 								target);
-	if (locked > 0) {
+	if (locked) {
 		STATS_INC(b->stats.refused_alloc[false]);
 
-		if (hv_status == VMW_BALLOON_ERROR_RESET ||
-				hv_status == VMW_BALLOON_ERROR_PPN_NOTNEEDED) {
+		if (locked == -EIO &&
+		    (hv_status == VMW_BALLOON_ERROR_RESET ||
+		     hv_status == VMW_BALLOON_ERROR_PPN_NOTNEEDED)) {
 			vmballoon_free_page(page, false);
 			return -EIO;
 		}
@@ -617,7 +624,7 @@ static int vmballoon_lock_page(struct vmballoon *b, unsigned int num_pages,
 		} else {
 			vmballoon_free_page(page, false);
 		}
-		return -EIO;
+		return locked;
 	}
 
 	/* track allocated page */
@@ -1029,29 +1036,30 @@ static void vmballoon_vmci_cleanup(struct vmballoon *b)
  */
 static int vmballoon_vmci_init(struct vmballoon *b)
 {
-	int error = 0;
+	unsigned long error, dummy;
 
-	if ((b->capabilities & VMW_BALLOON_SIGNALLED_WAKEUP_CMD) != 0) {
-		error = vmci_doorbell_create(&b->vmci_doorbell,
-				VMCI_FLAG_DELAYED_CB,
-				VMCI_PRIVILEGE_FLAG_RESTRICTED,
-				vmballoon_doorbell, b);
-
-		if (error == VMCI_SUCCESS) {
-			VMWARE_BALLOON_CMD(VMCI_DOORBELL_SET,
-					b->vmci_doorbell.context,
-					b->vmci_doorbell.resource, error);
-			STATS_INC(b->stats.doorbell_set);
-		}
-	}
+	if ((b->capabilities & VMW_BALLOON_SIGNALLED_WAKEUP_CMD) == 0)
+		return 0;
 
-	if (error != 0) {
-		vmballoon_vmci_cleanup(b);
+	error = vmci_doorbell_create(&b->vmci_doorbell, VMCI_FLAG_DELAYED_CB,
+				     VMCI_PRIVILEGE_FLAG_RESTRICTED,
+				     vmballoon_doorbell, b);
 
-		return -EIO;
-	}
+	if (error != VMCI_SUCCESS)
+		goto fail;
+
+	error = VMWARE_BALLOON_CMD(VMCI_DOORBELL_SET, b->vmci_doorbell.context,
+				   b->vmci_doorbell.resource, dummy);
+
+	STATS_INC(b->stats.doorbell_set);
+
+	if (error != VMW_BALLOON_SUCCESS)
+		goto fail;
 
 	return 0;
+fail:
+	vmballoon_vmci_cleanup(b);
+	return -EIO;
 }
 
 /*
@@ -1289,7 +1297,14 @@ static int __init vmballoon_init(void)
 
 	return 0;
 }
-module_init(vmballoon_init);
+
+/*
+ * Using late_initcall() instead of module_init() allows the balloon to use the
+ * VMCI doorbell even when the balloon is built into the kernel. Otherwise the
+ * VMCI is probed only after the balloon is initialized. If the balloon is used
+ * as a module, late_initcall() is equivalent to module_init().
+ */
+late_initcall(vmballoon_init);
 
 static void __exit vmballoon_exit(void)
 {