Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Subject: [4/5] USB: cdc-acm: fix unthrottle races From: Oliver Neukum Message-Id: <1556532564.20085.10.camel@suse.com> Date: Mon, 29 Apr 2019 12:09:24 +0200 To: Johan Hovold , Greg Kroah-Hartman , Alan Stern Cc: linux-usb@vger.kernel.org List-ID: T24gRG8sIDIwMTktMDQtMjUgYXQgMTg6MDUgKzAyMDAsIEpvaGFuIEhvdm9sZCB3cm90ZToKPiBG aXggdHdvIGxvbmctc3RhbmRpbmcgYnVncyB3aGljaCBjb3VsZCBwb3RlbnRpYWxseSBsZWFkIHRv IG1lbW9yeQo+IGNvcnJ1cHRpb24gb3IgbGVhdmUgdGhlIHBvcnQgdGhyb3R0bGVkIHVudGlsIGl0 IGlzIHJlb3BlbmVkIChvbiB3ZWFrbHkKPiBvcmRlcmVkIHN5c3RlbXMpLCByZXNwZWN0aXZlbHks IHdoZW4gcmVhZC1VUkIgY29tcGxldGlvbiByYWNlcyB3aXRoCj4gdW50aHJvdHRsZSgpLgo+IAo+ IEZpcnN0LCB0aGUgVVJCIG11c3Qgbm90IGJlIG1hcmtlZCBhcyBmcmVlIGJlZm9yZSBwcm9jZXNz aW5nIGlzIGNvbXBsZXRlCj4gdG8gcHJldmVudCBpdCBmcm9tIGJlaW5nIHN1Ym1pdHRlZCBieSB1 bnRocm90dGxlKCkgb24gYW5vdGhlciBDUFUuCj4gCj4gICAgICAgICBDUFUgMSAgICAgICAgICAg ICAgICAgICAgICAgICAgIENQVSAyCj4gICAgICAgICA9PT09PT09PT09PT09PT09ICAgICAgICAg ICAgICAgID09PT09PT09PT09PT09PT0KPiAgICAgICAgIGNvbXBsZXRlKCkgICAgICAgICAgICAg ICAgICAgICAgdW50aHJvdHRsZSgpCj4gICAgICAgICAgIHByb2Nlc3NfdXJiKCk7Cj4gICAgICAg ICAgIHNtcF9tYl9fYmVmb3JlX2F0b21pYygpOwo+ICAgICAgICAgICBzZXRfYml0KGksIGZyZWUp OyAgICAgICAgICAgICAgIGlmICh0ZXN0X2FuZF9jbGVhcl9iaXQoaSwgZnJlZSkpCj4gICAgICAg ICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICBzdWJtaXRfdXJiKCk7 Cj4gCj4gU2Vjb25kLCB0aGUgVVJCIG11c3QgYmUgbWFya2VkIGFzIGZyZWUgYmVmb3JlIGNoZWNr aW5nIHRoZSB0aHJvdHRsZWQKPiBmbGFnIHRvIHByZXZlbnQgdW50aHJvdHRsZSgpIG9uIGFub3Ro ZXIgQ1BVIGZyb20gZmFpbGluZyB0byBvYnNlcnZlIHRoYXQKPiB0aGUgVVJCIG5lZWRzIHRvIGJl IHN1Ym1pdHRlZCBpZiBjb21wbGV0ZSgpIHNlZXMgdGhhdCB0aGUgdGhyb3R0bGVkIGZsYWcKPiBp cyBzZXQuCj4gCj4gICAgICAgICBDUFUgMSAgICAgICAgICAgICAgICAgICAgICAgICAgIENQVSAy Cj4gICAgICAgICA9PT09PT09PT09PT09PT09ICAgICAgICAgICAgICAgID09PT09PT09PT09PT09 PT0KPiAgICAgICAgIGNvbXBsZXRlKCkgICAgICAgICAgICAgICAgICAgICAgdW50aHJvdHRsZSgp Cj4gICAgICAgICAgIHNldF9iaXQoaSwgZnJlZSk7ICAgICAgICAgICAgICAgdGhyb3R0bGVkID0g MDsKPiAgICAgICAgICAgc21wX21iX19hZnRlcl9hdG9taWMoKTsgICAgICAgICBzbXBfbWIoKTsK PiAgICAgICAgICAgaWYgKHRocm90dGxlZCkgICAgICAgICAgICAgICAgICBpZiAodGVzdF9hbmRf Y2xlYXJfYml0KGksIGZyZWUpKQo+ICAgICAgICAgICAgICAgICAgIHJldHVybjsgICAgICAgICAg ICAgICAgICAgICAgICAgc3VibWl0X3VyYigpOwo+IAo+IE5vdGUgdGhhdCB0ZXN0X2FuZF9jbGVh cl9iaXQoKSBvbmx5IGltcGxpZXMgYmFycmllcnMgd2hlbiB0aGUgdGVzdCBpcwo+IHN1Y2Nlc3Nm dWwuIFRvIGhhbmRsZSB0aGUgY2FzZSB3aGVyZSB0aGUgVVJCIGlzIHN0aWxsIGluIHVzZSBhbiBl eHBsaWNpdAo+IGJhcnJpZXIgbmVlZHMgdG8gYmUgYWRkZWQgdG8gdW50aHJvdHRsZSgpIGZvciB0 aGUgc2Vjb25kIHJhY2UgY29uZGl0aW9uLgo+IAo+IEFsc28gbm90ZSB0aGF0IHRoZSBmaXJzdCBy YWNlIHdhcyBmaXhlZCBieSAzNmU1OWUwZDcwZDYgKCJjZGMtYWNtOiBmaXgKPiByYWNlIGJldHdl ZW4gY2FsbGJhY2sgYW5kIHVudGhyb3R0bGUiKSBiYWNrIGluIDIwMTUsIGJ1dCB0aGUgYnVnIHdh cwo+IHJlaW50cm9kdWNlZCBhIHllYXIgbGF0ZXIuCj4gCj4gRml4ZXM6IDFhYmE1NzlmM2NmNSAo ImNkYy1hY206IGhhbmRsZSByZWFkIHBpcGUgZXJyb3JzIikKPiBGaXhlczogMDg4YzY0ZjgxMjg0 ICgiVVNCOiBjZGMtYWNtOiByZS13cml0ZSByZWFkIHByb2Nlc3NpbmciKQo+IFNpZ25lZC1vZmYt Ynk6IEpvaGFuIEhvdm9sZCA8am9oYW5Aa2VybmVsLm9yZz4KQWNrZWQtYnk6IE9saXZlciBOZXVr dW0gPG9uZXVrdW1Ac3VzZS5jb20+Cg==