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: usb hub driver bug in overcurrent handling? From: Alan Stern Message-Id: Date: Fri, 13 Jul 2018 16:35:33 -0400 (EDT) To: Bin Liu Cc: linux-usb@vger.kernel.org List-ID: T24gRnJpLCAxMyBKdWwgMjAxOCwgQmluIExpdSB3cm90ZToKCj4gSGksCj4gCj4gSSBnb3QgYSBy ZXBvcnQgc2F5aW5nIHRoYXQgd2hlbiBvdmVyY3VycmVudCBoYXBwZW5zIGluIG9uZSBvZiB0aGUg aHViCj4gZG93bnN0cmVhbSBwb3J0cywgVVNCX1BPUlRfU1RBVF9PVkVSQ1VSUkVOVCBpcyBub3Qg c2V0IGluIHBvcnRzdGF0dXMsCj4gaW5zdGVhZCBVU0JfUE9SVF9TVEFUX0NfT1ZFUkNVUlJFTlQg aXMgc2V0IGluIHBvcnRjaGFuZ2UsIHRoZW4gdGhlCj4gb3ZlcmN1cnJlbnQgY29uZGl0aW9uIGlz IG5vdCBoYW5kbGVkIGluIGh1Yl9ldmVudCgpLgo+IAo+IFRoZSBmb2xsb3dpbmcgcGF0Y2ggc29s dmVzIHRoZSBpc3N1ZS4KPiAKPiB0IGEvZHJpdmVycy91c2IvY29yZS9odWIuYyBiL2RyaXZlcnMv dXNiL2NvcmUvaHViLmMKPiBpbmRleCA0NDJiZTdmMzEyZjYuLjExODU1N2FjYzc0YiAxMDA2NDQK PiAtLS0gYS9kcml2ZXJzL3VzYi9jb3JlL2h1Yi5jCj4gKysrIGIvZHJpdmVycy91c2IvY29yZS9o dWIuYwo+IEBAIC0xMTQ0LDcgKzExNDQsOCBAQCBzdGF0aWMgdm9pZCBodWJfYWN0aXZhdGUoc3Ry dWN0IHVzYl9odWIgKmh1YiwgZW51bSBodWJfYWN0aXZhdGlvbl90eXBlIHR5cGUpCj4gICAgICAg ICAgICAgICAgICAgICAgICAgICogY2hlY2sgZm9yIGEgbmV3IGNvbm5lY3Rpb24KPiAgICAgICAg ICAgICAgICAgICAgICAgICAgKi8KPiAgICAgICAgICAgICAgICAgICAgICAgICBpZiAodWRldiB8 fCAocG9ydHN0YXR1cyAmIFVTQl9QT1JUX1NUQVRfQ09OTkVDVElPTikgfHwKPiAtICAgICAgICAg ICAgICAgICAgICAgICAgICAgKHBvcnRzdGF0dXMgJiBVU0JfUE9SVF9TVEFUX09WRVJDVVJSRU5U KSkKPiArICAgICAgICAgICAgICAgICAgICAgICAgICAgKHBvcnRzdGF0dXMgJiBVU0JfUE9SVF9T VEFUX09WRVJDVVJSRU5UKSB8fAo+ICsgICAgICAgICAgICAgICAgICAgICAgICAgICAocG9ydGNo YW5nZSAmIFVTQl9QT1JUX1NUQVRfQ19PVkVSQ1VSUkVOVCkpCj4gICAgICAgICAgICAgICAgICAg ICAgICAgICAgICAgICBzZXRfYml0KHBvcnQxLCBodWItPmNoYW5nZV9iaXRzKTsKPiAgCj4gICAg ICAgICAgICAgICAgIH0gZWxzZSBpZiAocG9ydHN0YXR1cyAmIFVTQl9QT1JUX1NUQVRfRU5BQkxF KSB7CgpQbGVhc2UgYWxzbyB1cGRhdGUgdGhlIGltbWVkaWF0ZWx5IHByZWNlZGluZyBjb21tZW50 LgoKPiBUaGUgdXNiMi4wIHNwZWMgc2VjdGlvbiAxMS4xMi41IHN0YXRlcwo+ICAgICAiSWYgYSBo dWIgaGFzIHBlci1wb3J0IHBvd2VyIHN3aXRjaGluZyBhbmQgcGVyLXBvcnQgY3VycmVudCBsaW1p dGluZywgYW4KPiAgICAgIG92ZXItY3VycmVudCBvbiBvbmUgcG9ydCBtYXkgc3RpbGwgY2F1c2Ug dGhlIHBvd2VyIG9uIGFub3RoZXIgcG9ydCB0bwo+ICAgICAgZmFsbCBiZWxvdyBzcGVjaWZpYyBt aW5pbXVtcy4gSW4gdGhpcyBjYXNlLCB0aGUgYWZmZWN0ZWQgcG9ydCBpcyBwbGFjZWQKPiAgICAg IGluIHRoZSBQb3dlci1PZmYgc3RhdGUgYW5kIENfUE9SVF9PVkVSX0NVUlJFTlQgaXMgc2V0IGZv ciB0aGUgcG9ydCwgYnV0Cj4gICAgICBQT1JUX09WRVJfQ1VSUkVOVCBpcyBub3Qgc2V0LiIKPiAK PiBTbyBpcyB0aGUgcGF0Y2ggYWJvdmUgYSBwcm9wZXIgZml4PyBvciBzb21ldGhpbmcgZWxzZSBt aWdodCBiZSBtaXNzaW5nPwoKSXQgY2VydGFpbmx5IHNlZW1zIGxpa2UgYSByZWFzb25hYmxlIHRo aW5nIHRvIGRvLiAgSWYgeW91IHNheSBpdCBmaXhlcyAKdGhlIHByb2JsZW0sIHdlIGNhbiBhZGQg aXQgaW4uCgpBbGFuIFN0ZXJuCi0tLQpUbyB1bnN1YnNjcmliZSBmcm9tIHRoaXMgbGlzdDogc2Vu ZCB0aGUgbGluZSAidW5zdWJzY3JpYmUgbGludXgtdXNiIiBpbgp0aGUgYm9keSBvZiBhIG1lc3Nh Z2UgdG8gbWFqb3Jkb21vQHZnZXIua2VybmVsLm9yZwpNb3JlIG1ham9yZG9tbyBpbmZvIGF0ICBo dHRwOi8vdmdlci5rZXJuZWwub3JnL21ham9yZG9tby1pbmZvLmh0bWwK