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: [RFC] driver core: don't hold dev's parent lock when using async probe From: martin_liu Message-Id: <20180524140021.GA214888@google.com> Date: Thu, 24 May 2018 22:00:21 +0800 To: Alan Stern Cc: gregkh@linuxfoundation.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, jenhaochen@google.com, liumartin@google.com List-ID: T24gVHVlLCBNYXkgMjIsIDIwMTggYXQgMDE6MDk6NDRQTSAtMDQwMCwgQWxhbiBTdGVybiB3cm90 ZToKPiBPbiBUdWUsIDIyIE1heSAyMDE4LCBtYXJ0aW5fbGl1IHdyb3RlOgo+IAo+ID4gbm90IHN1 cmUgaWYgd2Ugc3RpbGwgbmVlZCAnYmY3NGFkNWJjNDE3ICgiW1BBVENIXSBIb2xkIHRoZQo+ID4g ZGV2aWNlJ3MgcGFyZW50J3MgbG9jayBkdXJpbmcgcHJvYmUgYW5kIHJlbW92ZSIpJyBzaW5jZSBp dCBoYXMKPiA+IGJlZW4gdGhlcmUgb3ZlciAxMCB5ZWFycy4gSWYgd2Ugc3RpbGwgbmVlZCBpdCBh bmQgaGFyZCB0byBmaXggaXQKPiA+ICwgdGhlIHNpbXBsZSB3YXkgaXMgdG8gZmluZCBhIHBsYWNl IG5vdCB0byBhbGxvdyBVU0Igc3Vic3lzdGVtCj4gPiBkcml2ZXJzIHRvIGhhdmUgYXN5bmMgcHJv YmUgY2FwYWJpbGl0eS4gQW55IHN1Z2dlc3Rpb24gaXMgd2VsY29tZS4KPiAKPiBJIGRvbid0IHRo aW5rIHRoZSAiYWxsb3dzX2FzeW5jX3Byb2JpbmciIGF0dHJpYnV0ZSBpcyB0aGUgYmVzdCB3YXkg dG8gCj4gYXR0YWNrIHRoaXMuICBTb21lIG90aGVyIGFwcHJvYWNoLCBsaWtlIGEgc3BlY2lhbC1w dXJwb3NlIGZsYWcsIG1pZ2h0IAo+IGJlIGJldHRlci4KPiAKPiBZZXMsIFVTQiBzdGlsbCBuZWVk cyB0byBoYXZlIHBhcmVudCdzIGxvY2tzIGhlbGQgZHVyaW5nIHByb2JpbmcuICAKPiBIZXJlJ3Mg dGhlIHJlYXNvbi4gIEEgVVNCIGRldmljZSBjYW4gaGF2ZSBtdWx0aXBsZSBpbnRlcmZhY2VzLCBl YWNoCj4gYm91bmQgdG8gaXRzIG93biBkcml2ZXIuICBBIGRyaXZlciBtYXkgc29tZXRpbWVzIG5l ZWQgdG8gaXNzdWUgYSByZXNldCwKPiBidXQgaW4gVVNCIHRoZXJlJ3Mgbm8gd2F5IHRvIHJlc2V0 IGEgc2luZ2xlIGludGVyZmFjZS4gIE9ubHkgdGhlIGVudGlyZQo+IGRldmljZSBjYW4gYmUgcmVz ZXQsIGFuZCBvZiBjb3Vyc2UgdGhpcyBhZmZlY3RzIGFsbCB0aGUgaW50ZXJmYWNlcy4gIAo+IFRo ZXJlZm9yZSBhIGRyaXZlciBuZWVkcyB0byBhY3F1aXJlIHRoZSBkZXZpY2UgbG9jayBiZWZvcmUg aXQgY2FuIGlzc3VlCj4gYSByZXNldC4KPiAKPiBUaGUgcHJvYmxlbSBpcyB0aGF0IHRoZSBkcml2 ZXIncyB0aHJlYWQgbWF5IGFscmVhZHkgaG9sZCB0aGUgZGV2aWNlCj4gbG9jay4gIER1cmluZyBh IG5vcm1hbCBwcm9iZSBzZXF1ZW5jZSwgZm9yIGV4YW1wbGUsIHRoZSBpbnRlcmZhY2VzIGdldAo+ IHByb2JlZCBieSB0aGUgaHViIGRyaXZlciB3aGlsZSBpdCBvd25zIHRoZSBkZXZpY2UgbG9jay4g IEJ1dCBmb3IgcHJvYmVzCj4gdW5kZXIgb3RoZXIgY2lyY3Vtc3RhbmNlcyAoZm9yIGV4YW1wbGUs IGlmIHRoZSB1c2VyIHdyaXRlcyB0byB0aGUKPiBkcml2ZXIncyAiYmluZCIgYXR0cmlidXRlIGlu IHN5c2ZzKSwgdGhlIGRldmljZSBsb2NrIG1pZ2h0IG5vdCBiZSBoZWxkLgo+IAo+IEEgZHJpdmVy IGNhbm5vdCB0ZWxsIHRoZXNlIHR3byBjYXNlcyBhcGFydC4gIFRoZSBvbmx5IHdheSB0byBtYWtl IGl0Cj4gd29yayBhbGwgdGhlIHRpbWUgaXMgdG8gaGF2ZSB0aGUgY2FsbGVyIF9hbHdheXNfIGhv bGQgdGhlIGRldmljZSBsb2NrCj4gd2hpbGUgdGhlIGRyaXZlciBpcyBwcm9iZWQgKG9yIHRoZSBy ZW1vdmVkLCBmb3IgdGhhdCBtYXR0ZXIpLgo+IAo+IEFsYW4gU3Rlcm4KClRoYW5rcyBmb3IgdGhl IHJlcGx5IGFuZCBtb3JlIGRldGFpbCBhYm91dCB0aGUgYmFja2dyb3VkLiBJJ2QgbGlrZSB0bwpo YXZlIGEgY29uY2x1c2lvbiBhYm91dCBpdC4gUGxlYXNlIGtpbmRseSBjb3JyZWN0IG1lIGlmIG15 IHVuZGVyc3RhbmRpbmcKaXMgd3JvbmcuIFJlZ2FyZGluZyB0byB0aGUgInNwZWNpYWwtcHVycG9z ZSBmbGFnIiwgZG8geW91IG1lYW4gd2UgY291bGQKZmluZCBhIHBsYWNlIGluIFVTQiBzdWJzeXN0 ZW0gdG8gaGF2ZSB0aGUgZmxhZyBzZXQgKG5vdCBzdXJlIGlmIGl0J3MKZWFzeSB0byBmaW5kIGl0 KS4gRHJpdmVyIGNvcmUgd291bGQgYmUgYmFzZSBvbiB0aGUgZmxhZyB0byBkZWNpZGUgaWYgd2UK bmVlZCB0byBob2xkIHRoZSBkZXZpY2UncyBwYXJlbnQncyBsb2NrLgoKTWFydGluCi0tLQpUbyB1 bnN1YnNjcmliZSBmcm9tIHRoaXMgbGlzdDogc2VuZCB0aGUgbGluZSAidW5zdWJzY3JpYmUgbGlu dXgtdXNiIiBpbgp0aGUgYm9keSBvZiBhIG1lc3NhZ2UgdG8gbWFqb3Jkb21vQHZnZXIua2VybmVs Lm9yZwpNb3JlIG1ham9yZG9tbyBpbmZvIGF0ICBodHRwOi8vdmdlci5rZXJuZWwub3JnL21ham9y ZG9tby1pbmZvLmh0bWwK