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: uas: fix usb subsystem hang after power off hub port From: Oliver Neukum Message-Id: <1553791752.6310.2.camel@suse.com> Date: Thu, 28 Mar 2019 17:49:12 +0100 To: Alan Stern Cc: gregkh@linuxfoundation.org, usb-storage@lists.one-eyed-alien.net, Jacky.Cao@sony.com, Kento.A.Kobayashi@sony.com, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, linux-usb@vger.kernel.org List-ID: T24gRG8sIDIwMTktMDMtMjggYXQgMTE6NTcgLTA0MDAsIEFsYW4gU3Rlcm4gd3JvdGU6Cj4gT24g VGh1LCAyOCBNYXIgMjAxOSwgT2xpdmVyIE5ldWt1bSB3cm90ZToKPiAKPiA+IE9uIERvLCAyMDE5 LTAzLTI4IGF0IDA3OjUzICswMDAwLCBLZW50by5BLktvYmF5YXNoaUBzb255LmNvbSB3cm90ZToK PiA+ID4gSGksCj4gPiA+IAo+ID4gPiA+IFNvcnJ5LAo+ID4gPiA+IAo+ID4gPiA+IEkgdGhvdWdo dCB0aGlzIHdhcyBjbGVhci4gWW91ciBwYXRjaCBpcyBtYWtpbmcgdGhlIGFzc3VtcHRpb24gdGhh dCB0aGUgcmVzZXQgaXMgdHJpZ2dlcmVkIGJ5IHRoZSBTQ1NJIGxheWVyLiBZb3UgY2Fubm90IG1h a2UgdGhhdCBhc3N1bXB0aW9uLCBhcyB0aGVyZSBpcyBhbiBpb2N0bCBmb3IgcmVzZXR0aW5nIGEg VVNCIGRldmljZS4KPiA+ID4gPiBJbiBjYXNlIHdlIGFyZSBnZXR0aW5nIGFuIGVycm9yIGR1cmlu ZyB0aGUgcmVzZXQgKG91ciBlbmRwb2ludHMgdmFuaXNoKSwgdGhlIGRldmljZSBkcml2ZXIgbXVz dCByZXBvcnQgdGhhdCB0byB0aGUgVVNCIGxheWVyLCBzbyB0aGUgZHJpdmVyIHdpbGwgYWx3YXlz IGJlIGRpc2Nvbm5lY3RlZC4KPiA+ID4gPiBXZSBjYW5ub3QgZHJvcCBlcnJvcnMuCj4gPiA+ID4g Cj4gPiA+ID4gICBSZWdhcmRzCj4gPiA+ID4gICAgICAgICAgIE9saXZlcgo+ID4gPiAKPiA+ID4g VGhpcyBwYXRjaCBtb2RpZmllZCB1YXNfcG9zdF9yZXNldCB0byBza2lwIHJlYmluZCBvcGVyYXRp b24gdG8gYXZvaWQgZXhjZXB0aW9uIHdoaWxlIC1FTk9ERVYgaGFwcGVucyBub3QgZHJvcCBlcnJv ci4KPiA+ID4gSWYgdWFzX3Bvc3RfcmVzZXQgaGFwcGVucyAtRU5PREVWLCB1c2JfcmVzZXRfYW5k X3ZlcmlmeV9kZXZpY2UgbXVzdCBoYXBwZW4gZXJyb3IuCj4gPiA+IFNvLHdoZW4gd2UgdXNlIGlv Y3RsKFVTQkRFVkZTX1JFU0VUKSB0byByZXNldCBkZXZpY2UsIGlmIHVzYl9yZXNldF9hbmRfdmVy aWZ5X2RldmljZSBoYXBwZW5zIGVycm9yLCB0aGUgZXJyb3Igd2lsbCBiZSByZXBvcnRlZCB0aHJv dWdoIGlvY3RsIHJldHVybiB2YWx1ZS4gCj4gPiAKPiA+IE9LLCBJdCBpcyBwb3NzaWJsZSB0aGF0 IEkgYW0gc3R1cGlkLiBXZSBtdXN0IHJlYmluZCBpZiB1YXNfcG9zdF9yZXNldCgpCj4gPiBmYWls cy4gVGhlIGRyaXZlciB3aWxsIGNyYXNoIHdpdGhvdXQgdGhlIGVuZHBvaW50cy4gQ2FuIHlvdSBw bGVhc2UKPiA+IGV4cGxhaW4gYWdhaW4gaW4gZ3JlYXRlciBkZXRhaWwsIHdoYXQgeW91IGFyZSB0 cnlpbmcgdG8gYWNoaWV2ZT8KPiAKPiBBY3R1YWxseSBubywgdGhlIGRyaXZlciBkb2Vzbid0IGhh dmUgdG8gZG8gYW55dGhpbmcgaWYgdGhlIHBvc3QtcmVzZXQgCj4gbWV0aG9kIGZhaWxzLiAgdXNi Y29yZSB3aWxsIHRha2UgY2FyZSBvZiByZWJpbmRpbmcgYXV0b21hdGljYWxseS4KClllcywgYnV0 IHRoZSByZWJpbmRpbmcgaXMgbm90IG9wdGlvbmFsLiBIZW5jZSwgZWl0aGVyIHRoZSBwb3N0X3Jl c2V0KCkKbXVzdCBmYWlsIHRvIHRyaWdnZXIgaXQsIG9yIGl0IHdpbGwgYmUgdHJpZ2dlcmVkIGFu eXdheS4KU28gaWYgdGhlIHJlYmluZGluZyBoYW5ncyB0aGUgbWFjaGluZSwgSSBjYW5ub3Qgc2Vl IGhvdyBhbHRlcgpjaGFuZ2luZyB0aGUgcmV0dXJuIHZhbHVlIG9mIHVhc19wb3N0X3Jlc2V0KCkg d291bGQgaGVscC4KCkl0IGxvb2tzIHRvIG1lIGxpa2UgdGhlIHN0YXRlIHRyYW5zaXRpb25zIG9m IFNDU0kgYXJlIHRvbwpyZXN0cmljdGl2ZS4KCglSZWdhcmRzCgkJT2xpdmVyCg==