Merge 4.20-rc4 into tty-next

We need the gsps fixes in here for some other serdev patches we will be
merging into this branch.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

13 files changed, 98 insertions, 119 deletions

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 81d1d5a74728..19f4423e70d9 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -4713,6 +4713,8 @@
 					prevent spurious wakeup);
 				n = USB_QUIRK_DELAY_CTRL_MSG (Device needs a
 					pause after every control message);
+				o = USB_QUIRK_HUB_SLOW_RESET (Hub needs extra
+					delay after resetting its port);
 			Example: quirks=0781:5580:bk,0a5c:5834:gij
 
 	usbhid.mousepoll=
diff --git a/Documentation/admin-guide/pm/cpufreq.rst b/Documentation/admin-guide/pm/cpufreq.rst
index 47153e64dfb5..7eca9026a9ed 100644
--- a/Documentation/admin-guide/pm/cpufreq.rst
+++ b/Documentation/admin-guide/pm/cpufreq.rst
@@ -150,7 +150,7 @@ data structures necessary to handle the given policy and, possibly, to add
 a governor ``sysfs`` interface to it.  Next, the governor is started by
 invoking its ``->start()`` callback.
 
-That callback it expected to register per-CPU utilization update callbacks for
+That callback is expected to register per-CPU utilization update callbacks for
 all of the online CPUs belonging to the given policy with the CPU scheduler.
 The utilization update callbacks will be invoked by the CPU scheduler on
 important events, like task enqueue and dequeue, on every iteration of the
diff --git a/Documentation/admin-guide/security-bugs.rst b/Documentation/admin-guide/security-bugs.rst
index 164bf71149fd..30187d49dc2c 100644
--- a/Documentation/admin-guide/security-bugs.rst
+++ b/Documentation/admin-guide/security-bugs.rst
@@ -32,16 +32,17 @@ Disclosure and embargoed information
 The security list is not a disclosure channel.  For that, see Coordination
 below.
 
-Once a robust fix has been developed, our preference is to release the
-fix in a timely fashion, treating it no differently than any of the other
-thousands of changes and fixes the Linux kernel project releases every
-month.
-
-However, at the request of the reporter, we will postpone releasing the
-fix for up to 5 business days after the date of the report or after the
-embargo has lifted; whichever comes first.  The only exception to that
-rule is if the bug is publicly known, in which case the preference is to
-release the fix as soon as it's available.
+Once a robust fix has been developed, the release process starts.  Fixes
+for publicly known bugs are released immediately.
+
+Although our preference is to release fixes for publicly undisclosed bugs
+as soon as they become available, this may be postponed at the request of
+the reporter or an affected party for up to 7 calendar days from the start
+of the release process, with an exceptional extension to 14 calendar days
+if it is agreed that the criticality of the bug requires more time.  The
+only valid reason for deferring the publication of a fix is to accommodate
+the logistics of QA and large scale rollouts which require release
+coordination.
 
 Whilst embargoed information may be shared with trusted individuals in
 order to develop a fix, such information will not be published alongside
diff --git a/Documentation/core-api/xarray.rst b/Documentation/core-api/xarray.rst
index a4e705108f42..dbe96cb5558e 100644
--- a/Documentation/core-api/xarray.rst
+++ b/Documentation/core-api/xarray.rst
@@ -74,7 +74,8 @@ using :c:func:`xa_load`.  xa_store will overwrite any entry with the
 new entry and return the previous entry stored at that index.  You can
 use :c:func:`xa_erase` instead of calling :c:func:`xa_store` with a
 ``NULL`` entry.  There is no difference between an entry that has never
-been stored to and one that has most recently had ``NULL`` stored to it.
+been stored to, one that has been erased and one that has most recently
+had ``NULL`` stored to it.
 
 You can conditionally replace an entry at an index by using
 :c:func:`xa_cmpxchg`.  Like :c:func:`cmpxchg`, it will only succeed if
@@ -105,23 +106,44 @@ may result in the entry being marked at some, but not all of the other
 indices.  Storing into one index may result in the entry retrieved by
 some, but not all of the other indices changing.
 
+Sometimes you need to ensure that a subsequent call to :c:func:`xa_store`
+will not need to allocate memory.  The :c:func:`xa_reserve` function
+will store a reserved entry at the indicated index.  Users of the normal
+API will see this entry as containing ``NULL``.  If you do not need to
+use the reserved entry, you can call :c:func:`xa_release` to remove the
+unused entry.  If another user has stored to the entry in the meantime,
+:c:func:`xa_release` will do nothing; if instead you want the entry to
+become ``NULL``, you should use :c:func:`xa_erase`.
+
+If all entries in the array are ``NULL``, the :c:func:`xa_empty` function
+will return ``true``.
+
 Finally, you can remove all entries from an XArray by calling
 :c:func:`xa_destroy`.  If the XArray entries are pointers, you may wish
 to free the entries first.  You can do this by iterating over all present
 entries in the XArray using the :c:func:`xa_for_each` iterator.
 
-ID assignment
--------------
+Allocating XArrays
+------------------
+
+If you use :c:func:`DEFINE_XARRAY_ALLOC` to define the XArray, or
+initialise it by passing ``XA_FLAGS_ALLOC`` to :c:func:`xa_init_flags`,
+the XArray changes to track whether entries are in use or not.
 
 You can call :c:func:`xa_alloc` to store the entry at any unused index
 in the XArray.  If you need to modify the array from interrupt context,
 you can use :c:func:`xa_alloc_bh` or :c:func:`xa_alloc_irq` to disable
-interrupts while allocating the ID.  Unlike :c:func:`xa_store`, allocating
-a ``NULL`` pointer does not delete an entry.  Instead it reserves an
-entry like :c:func:`xa_reserve` and you can release it using either
-:c:func:`xa_erase` or :c:func:`xa_release`.  To use ID assignment, the
-XArray must be defined with :c:func:`DEFINE_XARRAY_ALLOC`, or initialised
-by passing ``XA_FLAGS_ALLOC`` to :c:func:`xa_init_flags`,
+interrupts while allocating the ID.
+
+Using :c:func:`xa_store`, :c:func:`xa_cmpxchg` or :c:func:`xa_insert`
+will mark the entry as being allocated.  Unlike a normal XArray, storing
+``NULL`` will mark the entry as being in use, like :c:func:`xa_reserve`.
+To free an entry, use :c:func:`xa_erase` (or :c:func:`xa_release` if
+you only want to free the entry if it's ``NULL``).
+
+You cannot use ``XA_MARK_0`` with an allocating XArray as this mark
+is used to track whether an entry is free or not.  The other marks are
+available for your use.
 
 Memory allocation
 -----------------
@@ -158,6 +180,8 @@ Takes RCU read lock:
 
 Takes xa_lock internally:
  * :c:func:`xa_store`
+ * :c:func:`xa_store_bh`
+ * :c:func:`xa_store_irq`
  * :c:func:`xa_insert`
  * :c:func:`xa_erase`
  * :c:func:`xa_erase_bh`
@@ -167,6 +191,9 @@ Takes xa_lock internally:
  * :c:func:`xa_alloc`
  * :c:func:`xa_alloc_bh`
  * :c:func:`xa_alloc_irq`
+ * :c:func:`xa_reserve`
+ * :c:func:`xa_reserve_bh`
+ * :c:func:`xa_reserve_irq`
  * :c:func:`xa_destroy`
  * :c:func:`xa_set_mark`
  * :c:func:`xa_clear_mark`
@@ -177,6 +204,7 @@ Assumes xa_lock held on entry:
  * :c:func:`__xa_erase`
  * :c:func:`__xa_cmpxchg`
  * :c:func:`__xa_alloc`
+ * :c:func:`__xa_reserve`
  * :c:func:`__xa_set_mark`
  * :c:func:`__xa_clear_mark`
 
@@ -234,7 +262,8 @@ Sharing the XArray with interrupt context is also possible, either
 using :c:func:`xa_lock_irqsave` in both the interrupt handler and process
 context, or :c:func:`xa_lock_irq` in process context and :c:func:`xa_lock`
 in the interrupt handler.  Some of the more common patterns have helper
-functions such as :c:func:`xa_erase_bh` and :c:func:`xa_erase_irq`.
+functions such as :c:func:`xa_store_bh`, :c:func:`xa_store_irq`,
+:c:func:`xa_erase_bh` and :c:func:`xa_erase_irq`.
 
 Sometimes you need to protect access to the XArray with a mutex because
 that lock sits above another mutex in the locking hierarchy.  That does
@@ -322,7 +351,8 @@ to :c:func:`xas_retry`, and retry the operation if it returns ``true``.
      - :c:func:`xa_is_zero`
      - Zero entries appear as ``NULL`` through the Normal API, but occupy
        an entry in the XArray which can be used to reserve the index for
-       future use.
+       future use.  This is used by allocating XArrays for allocated entries
+       which are ``NULL``.
 
 Other internal entries may be added in the future.  As far as possible, they
 will be handled by :c:func:`xas_retry`.
diff --git a/Documentation/cpu-freq/cpufreq-stats.txt b/Documentation/cpu-freq/cpufreq-stats.txt
index a873855c811d..14378cecb172 100644
--- a/Documentation/cpu-freq/cpufreq-stats.txt
+++ b/Documentation/cpu-freq/cpufreq-stats.txt
@@ -86,9 +86,11 @@ transitions.
 This will give a fine grained information about all the CPU frequency
 transitions. The cat output here is a two dimensional matrix, where an entry
 <i,j> (row i, column j) represents the count of number of transitions from 
-Freq_i to Freq_j. Freq_i is in descending order with increasing rows and 
-Freq_j is in descending order with increasing columns. The output here also 
-contains the actual freq values for each row and column for better readability.
+Freq_i to Freq_j. Freq_i rows and Freq_j columns follow the sorting order in
+which the driver has provided the frequency table initially to the cpufreq core
+and so can be sorted (ascending or descending) or unsorted.  The output here
+also contains the actual freq values for each row and column for better
+readability.
 
 If the transition table is bigger than PAGE_SIZE, reading this will
 return an -EFBIG error.
diff --git a/Documentation/devicetree/bindings/cpufreq/arm_big_little_dt.txt b/Documentation/devicetree/bindings/cpufreq/arm_big_little_dt.txt
deleted file mode 100644
index 2aa06ac0fac5..000000000000
--- a/Documentation/devicetree/bindings/cpufreq/arm_big_little_dt.txt
+++ /dev/null
@@ -1,65 +0,0 @@
-Generic ARM big LITTLE cpufreq driver's DT glue
------------------------------------------------
-
-This is DT specific glue layer for generic cpufreq driver for big LITTLE
-systems.
-
-Both required and optional properties listed below must be defined
-under node /cpus/cpu@x. Where x is the first cpu inside a cluster.
-
-FIXME: Cpus should boot in the order specified in DT and all cpus for a cluster
-must be present contiguously. Generic DT driver will check only node 'x' for
-cpu:x.
-
-Required properties:
-- operating-points: Refer to Documentation/devicetree/bindings/opp/opp.txt
-  for details
-
-Optional properties:
-- clock-latency: Specify the possible maximum transition latency for clock,
-  in unit of nanoseconds.
-
-Examples:
-
-cpus {
-	#address-cells = <1>;
-	#size-cells = <0>;
-
-	cpu@0 {
-		compatible = "arm,cortex-a15";
-		reg = <0>;
-		next-level-cache = <&L2>;
-		operating-points = <
-			/* kHz    uV */
-			792000  1100000
-			396000  950000
-			198000  850000
-		>;
-		clock-latency = <61036>; /* two CLK32 periods */
-	};
-
-	cpu@1 {
-		compatible = "arm,cortex-a15";
-		reg = <1>;
-		next-level-cache = <&L2>;
-	};
-
-	cpu@100 {
-		compatible = "arm,cortex-a7";
-		reg = <100>;
-		next-level-cache = <&L2>;
-		operating-points = <
-			/* kHz    uV */
-			792000  950000
-			396000  750000
-			198000  450000
-		>;
-		clock-latency = <61036>; /* two CLK32 periods */
-	};
-
-	cpu@101 {
-		compatible = "arm,cortex-a7";
-		reg = <101>;
-		next-level-cache = <&L2>;
-	};
-};
diff --git a/Documentation/devicetree/bindings/net/can/holt_hi311x.txt b/Documentation/devicetree/bindings/net/can/holt_hi311x.txt
index 903a78da65be..3a9926f99937 100644
--- a/Documentation/devicetree/bindings/net/can/holt_hi311x.txt
+++ b/Documentation/devicetree/bindings/net/can/holt_hi311x.txt
@@ -17,7 +17,7 @@ Example:
 		reg = <1>;
 		clocks = <&clk32m>;
 		interrupt-parent = <&gpio4>;
-		interrupts = <13 IRQ_TYPE_EDGE_RISING>;
+		interrupts = <13 IRQ_TYPE_LEVEL_HIGH>;
 		vdd-supply = <&reg5v0>;
 		xceiver-supply = <&reg5v0>;
 	};
diff --git a/Documentation/devicetree/bindings/net/can/rcar_can.txt b/Documentation/devicetree/bindings/net/can/rcar_can.txt
index cc4372842bf3..9936b9ee67c3 100644
--- a/Documentation/devicetree/bindings/net/can/rcar_can.txt
+++ b/Documentation/devicetree/bindings/net/can/rcar_can.txt
@@ -5,6 +5,7 @@ Required properties:
 - compatible: "renesas,can-r8a7743" if CAN controller is a part of R8A7743 SoC.
 	      "renesas,can-r8a7744" if CAN controller is a part of R8A7744 SoC.
 	      "renesas,can-r8a7745" if CAN controller is a part of R8A7745 SoC.
+	      "renesas,can-r8a774a1" if CAN controller is a part of R8A774A1 SoC.
 	      "renesas,can-r8a7778" if CAN controller is a part of R8A7778 SoC.
 	      "renesas,can-r8a7779" if CAN controller is a part of R8A7779 SoC.
 	      "renesas,can-r8a7790" if CAN controller is a part of R8A7790 SoC.
@@ -14,26 +15,32 @@ Required properties:
 	      "renesas,can-r8a7794" if CAN controller is a part of R8A7794 SoC.
 	      "renesas,can-r8a7795" if CAN controller is a part of R8A7795 SoC.
 	      "renesas,can-r8a7796" if CAN controller is a part of R8A7796 SoC.
+	      "renesas,can-r8a77965" if CAN controller is a part of R8A77965 SoC.
 	      "renesas,rcar-gen1-can" for a generic R-Car Gen1 compatible device.
 	      "renesas,rcar-gen2-can" for a generic R-Car Gen2 or RZ/G1
 	      compatible device.
-	      "renesas,rcar-gen3-can" for a generic R-Car Gen3 compatible device.
+	      "renesas,rcar-gen3-can" for a generic R-Car Gen3 or RZ/G2
+	      compatible device.
 	      When compatible with the generic version, nodes must list the
 	      SoC-specific version corresponding to the platform first
 	      followed by the generic version.
 
 - reg: physical base address and size of the R-Car CAN register map.
 - interrupts: interrupt specifier for the sole interrupt.
-- clocks: phandles and clock specifiers for 3 CAN clock inputs.
-- clock-names: 3 clock input name strings: "clkp1", "clkp2", "can_clk".
+- clocks: phandles and clock specifiers for 2 CAN clock inputs for RZ/G2
+	  devices.
+	  phandles and clock specifiers for 3 CAN clock inputs for every other
+	  SoC.
+- clock-names: 2 clock input name strings for RZ/G2: "clkp1", "can_clk".
+	       3 clock input name strings for every other SoC: "clkp1", "clkp2",
+	       "can_clk".
 - pinctrl-0: pin control group to be used for this controller.
 - pinctrl-names: must be "default".
 
-Required properties for "renesas,can-r8a7795" and "renesas,can-r8a7796"
-compatible:
-In R8A7795 and R8A7796 SoCs, "clkp2" can be CANFD clock. This is a div6 clock
-and can be used by both CAN and CAN FD controller at the same time. It needs to
-be scaled to maximum frequency if any of these controllers use it. This is done
+Required properties for R8A7795, R8A7796 and R8A77965:
+For the denoted SoCs, "clkp2" can be CANFD clock. This is a div6 clock and can
+be used by both CAN and CAN FD controller at the same time. It needs to be
+scaled to maximum frequency if any of these controllers use it. This is done
 using the below properties:
 
 - assigned-clocks: phandle of clkp2(CANFD) clock.
@@ -42,8 +49,9 @@ using the below properties:
 Optional properties:
 - renesas,can-clock-select: R-Car CAN Clock Source Select. Valid values are:
 			    <0x0> (default) : Peripheral clock (clkp1)
-			    <0x1> : Peripheral clock (clkp2)
-			    <0x3> : Externally input clock
+			    <0x1> : Peripheral clock (clkp2) (not supported by
+				    RZ/G2 devices)
+			    <0x3> : External input clock
 
 Example
 -------
diff --git a/Documentation/devicetree/bindings/net/dsa/dsa.txt b/Documentation/devicetree/bindings/net/dsa/dsa.txt
index 3ceeb8de1196..35694c0c376b 100644
--- a/Documentation/devicetree/bindings/net/dsa/dsa.txt
+++ b/Documentation/devicetree/bindings/net/dsa/dsa.txt
@@ -7,7 +7,7 @@ limitations.
 Current Binding
 ---------------
 
-Switches are true Linux devices and can be probes by any means. Once
+Switches are true Linux devices and can be probed by any means. Once
 probed, they register to the DSA framework, passing a node
 pointer. This node is expected to fulfil the following binding, and
 may contain additional properties as required by the device it is
diff --git a/Documentation/input/event-codes.rst b/Documentation/input/event-codes.rst
index cef220c176a4..a8c0873beb95 100644
--- a/Documentation/input/event-codes.rst
+++ b/Documentation/input/event-codes.rst
@@ -190,16 +190,7 @@ A few EV_REL codes have special meanings:
 * REL_WHEEL, REL_HWHEEL:
 
   - These codes are used for vertical and horizontal scroll wheels,
-    respectively. The value is the number of "notches" moved on the wheel, the
-    physical size of which varies by device. For high-resolution wheels (which
-    report multiple events for each notch of movement, or do not have notches)
-    this may be an approximation based on the high-resolution scroll events.
-
-* REL_WHEEL_HI_RES:
-
-  - If a vertical scroll wheel supports high-resolution scrolling, this code
-    will be emitted in addition to REL_WHEEL. The value is the (approximate)
-    distance travelled by the user's finger, in microns.
+    respectively.
 
 EV_ABS
 ------
diff --git a/Documentation/media/uapi/v4l/dev-meta.rst b/Documentation/media/uapi/v4l/dev-meta.rst
index f7ac8d0d3af1..b65dc078abeb 100644
--- a/Documentation/media/uapi/v4l/dev-meta.rst
+++ b/Documentation/media/uapi/v4l/dev-meta.rst
@@ -40,7 +40,7 @@ To use the :ref:`format` ioctls applications set the ``type`` field of the
 the desired operation. Both drivers and applications must set the remainder of
 the :c:type:`v4l2_format` structure to 0.
 
-.. _v4l2-meta-format:
+.. c:type:: v4l2_meta_format
 
 .. tabularcolumns:: |p{1.4cm}|p{2.2cm}|p{13.9cm}|
 
diff --git a/Documentation/media/uapi/v4l/vidioc-g-fmt.rst b/Documentation/media/uapi/v4l/vidioc-g-fmt.rst
index 3ead350e099f..9ea494a8faca 100644
--- a/Documentation/media/uapi/v4l/vidioc-g-fmt.rst
+++ b/Documentation/media/uapi/v4l/vidioc-g-fmt.rst
@@ -133,6 +133,11 @@ The format as returned by :ref:`VIDIOC_TRY_FMT <VIDIOC_G_FMT>` must be identical
       - Definition of a data format, see :ref:`pixfmt`, used by SDR
 	capture and output devices.
     * -
+      - struct :c:type:`v4l2_meta_format`
+      - ``meta``
+      - Definition of a metadata format, see :ref:`meta-formats`, used by
+	metadata capture devices.
+    * -
       - __u8
       - ``raw_data``\ [200]
       - Place holder for future extensions.
diff --git a/Documentation/networking/rxrpc.txt b/Documentation/networking/rxrpc.txt
index 605e00cdd6be..89f1302d593a 100644
--- a/Documentation/networking/rxrpc.txt
+++ b/Documentation/networking/rxrpc.txt
@@ -1056,18 +1056,23 @@ The kernel interface functions are as follows:
 
 	u32 rxrpc_kernel_check_life(struct socket *sock,
 				    struct rxrpc_call *call);
+	void rxrpc_kernel_probe_life(struct socket *sock,
+				     struct rxrpc_call *call);
 
-     This returns a number that is updated when ACKs are received from the peer
-     (notably including PING RESPONSE ACKs which we can elicit by sending PING
-     ACKs to see if the call still exists on the server).  The caller should
-     compare the numbers of two calls to see if the call is still alive after
-     waiting for a suitable interval.
+     The first function returns a number that is updated when ACKs are received
+     from the peer (notably including PING RESPONSE ACKs which we can elicit by
+     sending PING ACKs to see if the call still exists on the server).  The
+     caller should compare the numbers of two calls to see if the call is still
+     alive after waiting for a suitable interval.
 
      This allows the caller to work out if the server is still contactable and
      if the call is still alive on the server whilst waiting for the server to
      process a client operation.
 
-     This function may transmit a PING ACK.
+     The second function causes a ping ACK to be transmitted to try to provoke
+     the peer into responding, which would then cause the value returned by the
+     first function to change.  Note that this must be called in TASK_RUNNING
+     state.
 
  (*) Get reply timestamp.