From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Bart Van Assche To: "tom.leiming@gmail.com" CC: "hch@lst.de" , "linux-block@vger.kernel.org" , "snitzer@redhat.com" , "axboe@kernel.dk" Subject: Re: [PATCH 3/3] block: Protect less code with sysfs_lock in blk_{un,}register_queue() Date: Wed, 17 Jan 2018 17:19:06 +0000 Message-ID: <1516209545.2820.15.camel@wdc.com> References: <20180116181752.25847-1-bart.vanassche@wdc.com> <20180116181752.25847-4-bart.vanassche@wdc.com> <20180116223207.GA32637@redhat.com> <1516147421.2844.70.camel@wdc.com> <1516155470.3179.6.camel@wdc.com> In-Reply-To: Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 List-ID: T24gV2VkLCAyMDE4LTAxLTE3IGF0IDIxOjA0ICswODAwLCBNaW5nIExlaSB3cm90ZToNCj4gT24g V2VkLCBKYW4gMTcsIDIwMTggYXQgMTA6MTcgQU0sIEJhcnQgVmFuIEFzc2NoZQ0KPiA8QmFydC5W YW5Bc3NjaGVAd2RjLmNvbT4gd3JvdGU6DQo+ID4gU29ycnkgYnV0IEkgdGhpbmsgd2hhdCB5b3Ug d3JvdGUgaXMgd3JvbmcuIGtvYmplY3RfZGVsKCZxLT5rb2JqKSB3YWl0cyB1bnRpbCBhbGwNCj4g PiBvbmdvaW5nIHN5c2ZzIGNhbGxiYWNrIG1ldGhvZHMsIGluY2x1ZGluZyBlbHZfaW9zY2hlZF9z dG9yZSgpLCBoYXZlIGZpbmlzaGVkIGFuZA0KPiA+IHByZXZlbnRzIHRoYXQgYW55IG5ldyBlbHZf aW9zY2hlZF9zdG9yZSgpIGNhbGxzIHN0YXJ0LiBUaGF0IGlzIHdoeSBJIHRoaW5rIHRoZQ0KPiA+ IGFib3ZlIGNoYW5nZXMgZG8gbm90IHJlaW50cm9kdWNlIHRoZSByYWNlIGZpeGVkIGJ5IGNvbW1p dCBlOWE4MjNmYjM0YTggKCJibG9jazoNCj4gPiBmaXggd2FybmluZyB3aGVuIEkvTyBlbGV2YXRv ciBpcyBjaGFuZ2VkIGFzIHJlcXVlc3RfcXVldWUgaXMgYmVpbmcgcmVtb3ZlZCIpLg0KPiANCj4g QnV0IHlvdXIgcGF0Y2ggYmFzaWNhbGx5IHJldmVydHMgY29tbWl0IGU5YTgyM2ZiMzRhOCwgYW5k IEkganVzdCBzYXcgdGhlIHdhcm5pbmcNCj4gYWdhaW4gYWZ0ZXIgYXBwbHlpbmcgeW91ciBwYXRj aCBpbiBteSBzdHJlc3MgdGVzdCBvZiBzd2l0Y2hpbmcgZWxlbHZhdG86DQo+IA0KPiBbICAyMjUu OTk5NTA1XSBrb2JqZWN0X2FkZF9pbnRlcm5hbCBmYWlsZWQgZm9yIGlvc2NoZWQgKGVycm9yOiAt MiBwYXJlbnQ6IHF1ZXVlKQ0KPiBbICAyMjUuOTk5NTIxXSBXQVJOSU5HOiBDUFU6IDAgUElEOiAx MjcwNyBhdCBsaWIva29iamVjdC5jOjI0NA0KPiBrb2JqZWN0X2FkZF9pbnRlcm5hbCsweDIzNi8w eDI0Yw0KPiBbICAyMjUuOTk5NTY2XSBDYWxsIFRyYWNlOg0KPiBbICAyMjUuOTk5NTcwXSAga29i amVjdF9hZGQrMHg5ZS8weGM1DQo+IFsgIDIyNS45OTk1NzNdICBlbHZfcmVnaXN0ZXJfcXVldWUr MHgzNS8weGEyDQo+IFsgIDIyNS45OTk1NzVdICBlbGV2YXRvcl9zd2l0Y2grMHg3YS8weDFhNA0K PiBbICAyMjUuOTk5NTc3XSAgZWx2X2lvc2NoZWRfc3RvcmUrMHhkMi8weDEwMw0KPiBbICAyMjUu OTk5NTc5XSAgcXVldWVfYXR0cl9zdG9yZSsweDY2LzB4ODINCj4gWyAgMjI1Ljk5OTU4MV0gIGtl cm5mc19mb3Bfd3JpdGUrMHhmMy8weDEzNQ0KPiBbICAyMjUuOTk5NTgzXSAgX192ZnNfd3JpdGUr MHgzMS8weDE0Mg0KPiBbICAyMjUuOTk5NTkxXSAgdmZzX3dyaXRlKzB4Y2IvMHgxNmUNCj4gWyAg MjI1Ljk5OTU5M10gIFN5U193cml0ZSsweDVkLzB4YWINCj4gWyAgMjI1Ljk5OTU5NV0gIGVudHJ5 X1NZU0NBTExfNjRfZmFzdHBhdGgrMHgxYS8weDdkDQoNClRoZSBhYm92ZSBjYWxsIHN0YWNrIG1l YW5zIHRoYXQgc3lzZnNfY3JlYXRlX2Rpcl9ucygpIHJldHVybmVkIC1FTk9FTlQgYmVjYXVzZQ0K a29iai0+cGFyZW50LT5zZCB3YXMgTlVMTCAod2hlcmUga29iaiBpcyB0aGUgZWxldmF0b3Iga2Vy bmVsIG9iamVjdCkuIFRoYXQncw0KcHJvYmFibHkgYmVjYXNlIHN5c2ZzX3JlbW92ZV9kaXIoKSBj bGVhcnMgdGhlIHNkIHBvaW50ZXIgYmVmb3JlIHBlcmZvcm1pbmcgdGhlDQphY3R1YWwgcmVtb3Zh bC4gRnJvbSBmcy9zeXNmcy9kaXIuYzoNCg0KCXNwaW5fbG9jaygmc3lzZnNfc3ltbGlua190YXJn ZXRfbG9jayk7DQoJa29iai0+c2QgPSBOVUxMOw0KCXNwaW5fdW5sb2NrKCZzeXNmc19zeW1saW5r X3RhcmdldF9sb2NrKTsNCg0KCWlmIChrbikgew0KCQlXQVJOX09OX09OQ0Uoa2VybmZzX3R5cGUo a24pICE9IEtFUk5GU19ESVIpOw0KCQlrZXJuZnNfcmVtb3ZlKGtuKTsNCgl9DQoNCkluIHRoZSBw YXN0IHRoZXNlIHR3byBhY3Rpb25zIHdlcmUgcGVyZm9ybWVkIGluIHRoZSBvcHBvc2l0ZSBvcmRl ci4gU2VlIGFsc28NCmNvbW1pdCBhZWNkY2VkYWFiNDkgKCJzeXNmczogaW1wbGVtZW50IGtvYmpf c3lzZnNfYXNzb2NfbG9jayIpLiBBbnl3YXksIEkgd2lsbA0KcmV3b3JrIHRoaXMgcGF0Y2guDQoN CkJhcnQu