revert usb reset related commits

As it stands, they cause more harm than good for a point release.
This code will be returned later, when it is more mature

CHANGELOG.md

@@ -22,7 +22,6 @@ _At the moment, the project does __not__ adhere to [Semantic Versioning](http://
 - Cardano: change `network` to `protocol_magic`
 - tests can run interactively when `INTERACT=1` environment variable is set
 - protobuf: improved `to_dict` function
-- webusb: issue device reset before connecting (fixes weird device states)
 
 ### Deprecated
 - trezorctl: interactive signing with `sign-tx` is considered deprecated

trezorctl

@@ -374,8 +374,7 @@ def wipe_device(connect, bootloader):
             click.echo("Wiping user data!")
 
     try:
-        device.wipe(client)
-        click.echo("Device wiped")
+        return device.wipe(connect())
     except tools.CallException as e:
         click.echo("Action failed: {} {}".format(*e.args))
         sys.exit(3)

trezorlib/device.py

@@ -45,7 +45,6 @@ class TrezorDevice:
 
 
 @expect(proto.Success, field="message")
-@session
 def apply_settings(
     client,
     label=None,
@@ -75,7 +74,6 @@ def apply_settings(
 
 
 @expect(proto.Success, field="message")
-@session
 def apply_flags(client, flags):
     out = client.call(proto.ApplyFlags(flags=flags))
     client.init_device()  # Reload Features
@@ -83,7 +81,6 @@ def apply_flags(client, flags):
 
 
 @expect(proto.Success, field="message")
-@session
 def change_pin(client, remove=False):
     ret = client.call(proto.ChangePin(remove=remove))
     client.init_device()  # Re-read features
@@ -96,26 +93,14 @@ def set_u2f_counter(client, u2f_counter):
     return ret
 
 
-def wipe(client) -> bool:
-    """Initiate device wipe.
-
-    Returns whether it's safe to continue using the client instance.
-    (see comment in `WebUsbHandle.open`)
-    """
-    # This is not marked @session by design: the subsequent init_device should run
-    # in a separate session, so that when it triggers a USB error, a subsequent
-    # re-enumeration fixes it. See comment in WebUsbHandle.open
-    # XXX this should actually call the USB reset explicitly
-    client.call(proto.WipeDevice())
-    try:
-        client.init_device()
-        return True
-    except Exception:
-        return False
+@expect(proto.Success, field="message")
+def wipe(client):
+    ret = client.call(proto.WipeDevice())
+    client.init_device()
+    return ret
 
 
 @expect(proto.Success, field="message")
-@session
 def recover(
     client,
     word_count=24,

trezorlib/transport/webusb.py

@@ -53,16 +53,6 @@ class WebUsbHandle:
             else:
                 args = ()
             raise IOError("Cannot open device", *args)
-
-        self.handle.resetDevice()
-        # XXX this may fail with LIBUSB_ERROR_NOT_FOUND
-        # This will usually happen after device wipe, because USB serial has changed,
-        # and requires re-enumeration and reacquiring of the device.
-        # I haven't found a reasonable way of handling it here, or in the enumeration
-        # step. (In particular, it seems impossible to force libusb to re-enumerate
-        # explicitly, without calling device reset.)
-        # So now I'm just leaving it here to crash in some cases.
-
         self.handle.claimInterface(self.interface)
 
     def close(self) -> None: