From mboxrd@z Thu Jan 1 00:00:00 1970 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Subject: [v4] cdc-acm: fix abnormal DATA RX issue for Mediatek Preloader. From: Johan Hovold Message-Id: <20181218114447.GB10562@localhost> Date: Tue, 18 Dec 2018 12:44:47 +0100 To: Macpaul Lin Cc: Johan Hovold , Oliver Neukum , Greg Kroah-Hartman , linux-usb@vger.kernel.org, stable@vger.kernel.org, Mediatek WSD Upstream List-ID: T24gVHVlLCBEZWMgMTgsIDIwMTggYXQgMDc6Mzg6MDdQTSArMDgwMCwgTWFjcGF1bCBMaW4gd3Jv dGU6Cj4gTWVkaWF0ZWsgUHJlbG9hZGVyIGlzIGEgcHJvcHJpZXRhcnkgZW1iZWRkZWQgYm9vdCBs b2FkZXIgZm9yIGxvYWRpbmcKPiBMaXR0bGUgS2VybmVsIGFuZCBMaW51eCBpbnRvIGRldmljZSBE UkFNLgo+IAo+IFRoaXMgYm9vdCBsb2FkZXIgYWxzbyBoYW5kbGUgZmlybXdhcmUgdXBkYXRlLiBN ZWRpYXRlayBQcmVsb2FkZXIgd2lsbCBiZQo+IGVudW1lcmF0ZWQgYXMgYSB2aXJ0dWFsIENPTSBw b3J0IHdoZW4gdGhlIGRldmljZSBpcyBjb25uZWN0ZWQgdG8gV2luZG93cwo+IG9yIExpbnV4IE9T IHZpYSBDREMtQUNNIGNsYXNzIGRyaXZlci4gV2hlbiB0aGUgVVNCIGVudW1lcmF0aW9uIGhhcyBi ZWVuCj4gZG9uZSwgTWVkaWF0ZWsgUHJlbG9hZGVyIHdpbGwgc2VuZCBvdXQgaGFuZHNoYWtlIGNv bW1hbmQgIlJFQURZIiB0byBQQwo+IGFjdGl2ZWx5IGluc3RlYWQgb2Ygd2FpdGluZyBjb21tYW5k IGZyb20gdGhlIGRvd25sb2FkIHRvb2wuCj4gU2luY2UgTGludXggNC4xMiwgdGhlIGNvbW1pdCAi dHR5OiByZXNldCB0ZXJtaW9zIHN0YXRlIG9uIGRldmljZQo+IHJlZ2lzdHJhdGlvbiIgKDkzODU3 ZWRkOTgyOWUxNDRhY2I2YzdlNzJkNTkzZjZlMDFhZWFkNjYpIGNhdXNlcyBNZWRpYXRlawo+IFBy ZWxvYWRlciByZWNlaXZpbmcgc29tZSBhYm5vcmFtbCBjb21tYW5kIGxpa2UgIlJFQURZWFgiIGFz IGl0IHNlbnQuCj4gVGhpcyB3aWxsIGJlIHJlY29nbml6ZWQgYXMgYW4gaW5jb3JyZWN0IHJlc3Bv bnNlLiBUaGUgYmVoYXZpb3IgY2hhbmdlCj4gYWxzbyBjYXVzZXMgdGhlIGRvd25sb2FkIGhhbmRz aGFrZSBmYWlsLgoKUGxlYXNlIG1lbnRpb24gdGhhdCB0aGlzIGNoYW5nZSBvbmx5IGFmZmVjdHMg c3Vic2VxdWVudCBjb25uZWN0cyBpZiB0aGUKcmVjb25uZWN0ZWQgZGV2aWNlIGhhcHBlbnMgdG8g Z2V0IHRoZSBzYW1lIG1pbm9yIG51bWJlci4KCj4gQnkgZGlzYWJsaW5nIHRoZSBFQ0hPIHRlcm1p b3MgZmxhZyBjb3VsZCBhdm9pZCB0aGlzIHByb2JsZW0uIEhvd2V2ZXIsIGl0Cj4gY2Fubm90IGJl IGRvbmUgYnkgdXNlciBzcGFjZSBjb25maWd1cmF0aW9uIHdoZW4gZG93bmxvYWQgdG9vbCBvcGVu Cj4gL2Rldi90dHlBQ00wLiBUaGlzIGlzIGJlY2F1c2UgdGhlIGRldmljZSBydW5uaW5nIE1lZGlh dGVrIFByZWxvYWRlciB3aWxsCj4gc2VuZCBoYW5kc2hha2UgY29tbWFuZCAiUkVBRFkiIGltbWVk aWF0ZWx5IG9uY2UgdGhlIENEQy1BQ00gZHJpdmVyIGlzCj4gcmVhZHkuCj4gCj4gVGhpcyBwYXRj aCB3YW50cyB0byBmaXggYWJvdmUgcHJvYmxlbSBieSBpbnRyb2R1Y2luZyAiRElTQUJMRV9FQ0hP Igo+IHByb3BlcnR5IGluIGRyaXZlcl9pbmZvLiBXaGVuIE1lZGlhdGVrIFByZWxvYWRlciBpcyBj b25uZWN0ZWQsIHRoZQo+IENEQy1BQ00gZHJpdmVyIGNvdWxkIGRpc2FibGUgRUNITyBmbGFnIGlu IHRlcm1pb3MgdG8gYXZvaWQgdGhlIHByb2JsZW0uCj4gCj4gU2lnbmVkLW9mZi1ieTogTWFjcGF1 bCBMaW4gPG1hY3BhdWwubGluQG1lZGlhdGVrLmNvbT4KCkFuZCB5b3UgY2FuIGFkZCBhIENDIHN0 YWJsZSB0YWcgaGVyZS4KCj4gLS0tCj4gQ2hhbmdlcyBmb3IgdjI6Cj4gIC0gTW92ZSBxdWlya3Mg dGVzdGluZyBvZiBESVNBQkxFX0VDSE8gZmxhZyBpbnRvIGFjbV90dHlfaW5zdGFsbCgpLgo+ICAt IENoYW5nZSBxdWlya3MgdGVzdGluZyBpbnRvIGJpdHdpc2UgY29tcGFyaXNvbi4KPiBDaGFuZ2Vz IGZvciB2MzoKPiAgLSBSZXBsYWNlIHF1aXJrcyB0ZXN0aW5nIGZyb20gaW5pdF90ZXJtaW9zIHRv IHR0eS0+dGVybWlvcy4KPiAgLSBSZW1vdmUgcGFyZW50aGVzaXMgZm9yIEVDSE8gZmxhZy4KPiBD aGFuZ2VzIGZvciB2NDoKPiAgLSBEcm9wIHF1aXJrcyB2YXJpYmxlIHRvIHNpbXBsaWZ5IHRoZSBw YXRjaC4KPiAgLSBNb3ZlIHRlcm1pb3Mgb3BlcmF0aW9uIHJpZ2h0IGFmdGVyIHRoZSBkcml2ZXJf ZGF0YSBoYXMgYmVlbiBpbnN0YWxsZWQuCgpObywgaXQgc2hvdWxkIGdvIGFmdGVyIHRoZSAqdHR5 KiBoYXMgYmVlbiBpbnN0YWxsZWQgKGFuZCAqYmVmb3JlKgpzZXR0aW5nIGRyaXZlcl9kYXRhKQoK PiAgLSBXcml0ZSBnZW5lcmFsIHN0eWxlIGNvbW1lbnQgZm9yIHN1cHByZXNzaW5nIGluaXRpYWwg ZWNob2luZy4gCgo+ICBkcml2ZXJzL3VzYi9jbGFzcy9jZGMtYWNtLmMgfCAxMiArKysrKysrKysr Ky0KPiAgZHJpdmVycy91c2IvY2xhc3MvY2RjLWFjbS5oIHwgIDEgKwo+ICAyIGZpbGVzIGNoYW5n ZWQsIDEyIGluc2VydGlvbnMoKyksIDEgZGVsZXRpb24oLSkKPiAKPiBkaWZmIC0tZ2l0IGEvZHJp dmVycy91c2IvY2xhc3MvY2RjLWFjbS5jIGIvZHJpdmVycy91c2IvY2xhc3MvY2RjLWFjbS5jCj4g aW5kZXggMWI2OGZlZC4uYWI4NjA5ZSAxMDA2NDQKPiAtLS0gYS9kcml2ZXJzL3VzYi9jbGFzcy9j ZGMtYWNtLmMKPiArKysgYi9kcml2ZXJzL3VzYi9jbGFzcy9jZGMtYWNtLmMKPiBAQCAtNTgzLDYg KzU4MywxMyBAQCBzdGF0aWMgaW50IGFjbV90dHlfaW5zdGFsbChzdHJ1Y3QgdHR5X2RyaXZlciAq ZHJpdmVyLCBzdHJ1Y3QgdHR5X3N0cnVjdCAqdHR5KQo+ICAKPiAgCXR0eS0+ZHJpdmVyX2RhdGEg PSBhY207Cj4gIAo+ICsJLyoKPiArCSAqIFN1cHByZXNzIGluaXRpYWwgZWNob2luZyBmb3Igc29t ZSBkZXZpY2VzIHdoaWNoIG1pZ2h0IHNlbmQgZGF0YQo+ICsJICogaW1tZWRpYXRlbHkgYWZ0ZXIg YWNtIGRyaXZlciBoYXMgYmVlbiBpbnN0YWxsZWQuCj4gKwkgKi8KPiArCWlmIChhY20tPnF1aXJr cyAmIERJU0FCTEVfRUNITykKPiArCQl0dHktPnRlcm1pb3MuY19sZmxhZyAmPSB+RUNITzsKCllv dSBmb3Jnb3QgdG8gbW92ZSB0aGlzIGFib3ZlIHNldHRpbmcgdHR5LT5kcml2ZXIgZGF0YS4KCj4g Kwo+ICAJcmV0dXJuIDA7CgpUaGFua3MsCkpvaGFuCg==