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: MUSB interrupt storm on device removal From: Alan Stern Message-Id: Date: Thu, 24 Jan 2019 10:22:26 -0500 (EST) To: Johan Hovold Cc: Bin Liu , Greg KH , =?iso-8859-1?Q?M=E5ns_Rullg=E5rd?= , USB list List-ID: T24gVGh1LCAyNCBKYW4gMjAxOSwgSm9oYW4gSG92b2xkIHdyb3RlOgoKPiA+IEF0IGxlYXN0IHdo ZW4gLUVQUk9UTyBlcnJvcnMgYXJlIGNhdXNlZCBieSBkZXZpY2UgZGlzY29ubmVjdCwgd2Uga25v dyAKPiA+IHRoYXQgdGhleSB3aWxsIGV2ZW50dWFsbHkgZ28gYXdheSB3aGVuIHRoZSB1cHN0cmVh bSBodWIgcmVwb3J0cyB0aGUgCj4gPiBwb3J0IGRpc2Nvbm5lY3QgZXZlbnQuICBCdXQgdW50aWwg dGhlbiwgYW4gaW50ZXJydXB0IHN0b3JtIGlzIGNlcnRhaW5seSAKPiA+IHBvc3NpYmxlLgo+IAo+ IEluZGVlZCwgYW5kIHRoaXMgaXNuJ3QgdGhlIGZpcnN0IHRpbWUgd2UndmUgaGFkIHRoaXMgZGlz Y3Vzc2lvbiBlaXRoZXIgSQo+IHJlYWxpc2VkLgo+IAo+IEluIGZhY3QsIEkndmUgYmVlbiBoaXQg YnkgdGhpcyBteXNlbGYgb24gQkJCIGFuZCBtdXNiIHdoZW4gZGlzY29ubmVjdGluZwo+IGEgZGV2 aWNlIGNvbm5lY3RlZCB0aHJvdWdoIGFuIGV4dGVybmFsIGh1Yi4KPiAKPiBBdCB0aGUgdGltZSwg dGhlIGltbWVkaWF0ZSBjYXVzZXMgdGhhdCB3ZXJlIG1ha2luZyB0aGUgY29tcGxldGlvbgo+IGhh bmRsZXIgdGFrZSBsb25nZXIgdGhhbiB1c3VhbCAodW5hbGlnbmVkIGNvcHkgb2YgYSBsYXJnZSBi dWZmZXIgYW5kIGEKPiBwcmludGsgcmVzcGVjdGl2ZWx5KSBjb3VsZCBiZSBmaXhlZC4gVGhlIHBy b2JsZW0gd2VudCBhd2F5LCBidXQgb2YKPiBjb3Vyc2Ugbm90IHRoZSB1bmRlcmx5aW5nIGlzc3Vl Lgo+IAo+IE5vdGUgdGhhdCB0aGUgcHJvYmxlbSBJIHdhcyBzZWVpbmcgYWxzbyB3ZW50IGF3YXkg Ym90aCB3aGVuIHN3aXRjaGluZyB0bwo+IGEgZGlmZmVyZW50IHNpbmdsZS1jb3JlIFNvQyB1c2lu ZyBlaGNpLW9tYXAsIG9yIHdoZW4gcmVwbGFjaW5nIHRoZQo+IGV4dGVybmFsIGh1Yi4gSUlSQyBp dCB3YXNuJ3QgdGhlIGh1YiB3b3JrcXVldWUgdGhhdCB3YXMgc3RhcnZlZCBhcyBhIEkKPiBmaXJz dCBoYWQgdGhvdWdodCwgYnV0IHRoZSBodWIgaW50ZXJydXB0IHdhcyBuZXZlciBldmVuIHJlY2Vp dmVkIChvcgo+IHByb2Nlc3NlZCBhdCBsZWFzdCkuCj4gCj4gVW5mb3J0dW5hdGVseSwgSSBuZXZl ciBnb3QgYXJvdW5kIHRvIGludmVzdGlnYXRpbmcgdGhpcyBmdXJ0aGVyLgoKSSBndWVzcyBub3cg d2UgaGF2ZSBzb21lIG1vdGl2YXRpb24gdG8gbG9vayBpbnRvIHRoaXMgbW9yZSBjbG9zZWx5LiAg Oi0pCgo+ID4gPiA+IE15IHBvaW50IHdhcyB0aGF0IHVubGVzcyB5b3UgZml4IHRoaXMgYXQgdGhl IEhDRCBsZXZlbCwgeW91IHdpbGwgbmVlZCB0bwo+ID4gPiA+IGFkZCBjb21wbGV4IHJlY292ZXJ5 IGhhbmRsaW5nIHRvIGV2ZXJ5IFVTQiBkcml2ZXIgYW5kIGNvbXBsZXRpb24gaGFuZGxlcgo+ID4g PiA+ICh+NTAwIG9mIHRob3NlKS4gQnV0IHBlcmhhcHMgdGhhdCBpcyB3aGF0IGl0IG5lZWRlZC4K PiA+ID4gCj4gPiA+IG9rYXksIGl0IHByb2JhYmx5IG1ha2Ugc2Vuc2UgdG8gaGFuZGxlIHRoZSBj YXNlIGluIEhDRCBiZWNhdXNlIHRoZQo+ID4gPiBudW1iZXIgb2YgSENEIGlzIG11Y2ggbGVzcy4K PiA+IAo+ID4gT25lIHBvc3NpYmlsaXR5IGlzIHRvIGdpdmViYWNrIFVSQnMgd2l0aCBjZXJ0YWlu IGVycm9ycyAoc3VjaCBhcwo+ID4gLUVQUk9UTykgb25seSBhdCBhIGZyYW1lIGJvdW5kYXJ5LCBv ciBhdCAxLW1zIGludGVydmFscy4gIFRoaXMgZmVlbHMgCj4gPiBsaWtlIGEgdmVyeSBhcnRpZmlj aWFsIHNvbHV0aW9uLCB0aG91Z2guCj4gPiAKPiA+ID4gPiBJIGRvIHNlZSBub3cgdGhhdCBvZiBh bGwgVVNCIGRyaXZlcnMgd2UgaGF2ZSB0d28gZHJpdmVycyB0aGF0IGhhbmRsZXMKPiA+ID4gPiAt RVBST1RPIGJ5IHJlc3VibWl0dGluZyBhZnRlciBhIGRlbGF5LCB3aGlsZSBhIGhhbmRmdWwgZXhw bGljaXRseSBkZWFscwo+ID4gPiA+IHdpdGggLUVQUk9UTyBieSBzaW1wbHkgc3RvcHBpbmcgdG8g cmVzdWJtaXQgKHNvbWUgcHJvYmFibHkgYmFpbCBvdXQgb24KPiA+ID4gPiBhbGwgZXJyb3JzLCBi dXQgdGhlIG1ham9yaXR5IGFwcGVhciB0byByZXN1Ym1pdCBvbiAtRVBST1RPKS4KPiA+IAo+ID4g QW55IGRyaXZlciB3aGljaCBpbW1lZGlhdGVseSByZXRyaWVzIGFuIFVSQiBhZnRlciBnZXR0aW5n IC1FUFJPVE8gb3IKPiA+IC1FSUxTRVEgb3IgLUVUSU1FLCBhbmQgaGFzIG5vIG1lY2hhbmlzbSBm b3IgYmFja2luZyBvZmYgb3IgbGltaXRpbmcgdGhlCj4gPiByZXRyaWVzLCBpcyBidWdneS4gIEFz IGZhciBhcyBJIGNhbiBzZWUsIHRoYXQncyBhbGwgdGhlcmUgaXMgdG8gaXQuCj4gCj4gSSB0ZW5k IHRvIGFncmVlIHdpdGggeW91IG9uIHRoYXQsIGJ1dCBhZGRpbmcgY29tcGxleCBiYWNrLW9mZiBo YW5kbGluZwo+IG9mIGludGVybWl0dGVudCBlcnJvcnMgdG8gZXZlcnkgVVNCIGRyaXZlciBhbmQg Y29tcGxldGlvbiBoYW5kbGVyIHdpbGwKPiBiZSBxdWl0ZSBhIGJpdCBvZiB3b3JrLiBVbmxlc3Mg dGhlIEhDRCBkcml2ZXJzIGNhbiBhc3Npc3QsIHdlJ2QgYXQgbGVhc3QKPiB3YW50IGhhdmUgc29t ZSBwYXJ0IG9mIHRoZSBpbXBsZW1lbnRhdGlvbiBwcm92aWRlZCBieSBzaGFyZWQgY29kZS4KPiAK PiBBbHNvIG5vdGUgdGhhdCBzaW1wbHkgc3RhcnRpbmcgdG8gYmFpbCBvdXQgb24gYW55IGVycm9y IG5vdyB3b3VsZCByaXNrCj4gaW50cm9kdWNpbmcgcmVncmVzc2lvbnMgZm9yIHNldHVwcyB3aGVy ZSBpbnRlcm1pdHRlbnQgZXJyb3JzIGRvIG9jY3VyLgoKQWdyZWVkLgoKPiA+IFdoeSBkb2Vzbid0 IHRoZSBzYW1lIHByb2JsZW0gb2NjdXIgd2l0aCBvdGhlciB0eXBlcyBvZiBob3N0IGNvbnRyb2xs ZXI/Cj4gCj4gSSB0aGluayB3ZSBzaG91bGQgZ2V0IHRvIHRoZSBib3R0b20gb2YgdGhhdC4gQkJC IGlzIHNpbmdsZSBjb3JlIHdoaWNoCj4gbWF5IGJlIHBhcnQgb2YgdGhlIHJlYXNvbiB3aHkgaXQn cyBhZmZlY3RlZCwgYnV0IGl0J3MgZGVmaW5pdGVseSByZWxhdGVkCj4gdG8gdGhlIGNvbnRyb2xs ZXIgYXMgd2VsbC4KClBlcmhhcHMgaXQgaGFzIHNvbWV0aGluZyB0byBkbyB3aXRoIHRoZSB0aW1p bmcgb2YgdGhlIGNvbXBsZXRpb24gCmludGVycnVwdHMuICBJIGRvbid0IGtub3cgYW55dGhpbmcg YWJvdXQgaG93IG11c2Igd29ya3MsIHRob3VnaC4gIFNvbWUgCmxvdy1sZXZlbCB0aW1pbmcgaW5m b3JtYXRpb24gd291bGQgYmUgZ29vZCB0byBzZWUuCgpBbGFuIFN0ZXJuCg==