From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Bart Van Assche To: "tj@kernel.org" CC: "hch@lst.de" , "linux-block@vger.kernel.org" , "axboe@kernel.dk" Subject: Re: [PATCH v2] blk-mq: Fix race between resetting the timer and completion handling Date: Thu, 8 Feb 2018 17:10:45 +0000 Message-ID: <1518109843.3611.25.camel@wdc.com> References: <20180207011133.25957-1-bart.vanassche@wdc.com> <20180207170612.GB695913@devbig577.frc2.facebook.com> <1518024428.2870.35.camel@wdc.com> <20180207173531.GC695913@devbig577.frc2.facebook.com> <1518027251.2870.53.camel@wdc.com> <20180207200724.GD695913@devbig577.frc2.facebook.com> <1518047297.2870.80.camel@wdc.com> <1518052193.2870.90.camel@wdc.com> <20180208153940.GM695913@devbig577.frc2.facebook.com> <1518107501.3611.19.camel@wdc.com> <20180208170010.GP695913@devbig577.frc2.facebook.com> In-Reply-To: <20180208170010.GP695913@devbig577.frc2.facebook.com> Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 List-ID: T24gVGh1LCAyMDE4LTAyLTA4IGF0IDA5OjAwIC0wODAwLCB0akBrZXJuZWwub3JnIHdyb3RlOg0K PiBPbiBUaHUsIEZlYiAwOCwgMjAxOCBhdCAwNDozMTo0M1BNICswMDAwLCBCYXJ0IFZhbiBBc3Nj aGUgd3JvdGU6DQo+ID4gVGhlIGNyYXNoIGlzIHJlcG9ydGVkIGF0IGFkZHJlc3Mgc2NzaV90aW1l c19vdXQrMHgxNyA9PSBzY3NpX3RpbWVzX291dCsyMy4gVGhlDQo+ID4gaW5zdHJ1Y3Rpb24gYXQg dGhhdCBhZGRyZXNzIHRyaWVzIHRvIGRlcmVmZXJlbmNlIHNjc2lfY21uZC5kZXZpY2UgKCVyYXgp LiBUaGUNCj4gPiByZWdpc3RlciBkdW1wIHNob3dzIHRoYXQgdGhhdCBwb2ludGVyIGhhcyB0aGUg dmFsdWUgTlVMTC4gVGhlIG9ubHkgZnVuY3Rpb24gSQ0KPiA+IGtub3cgb2YgdGhhdCBjbGVhcnMg dGhlIHNjc2lfY21uZC5kZXZpY2UgcG9pbnRlciBpcyBzY3NpX3JlcV9pbml0KCkuIFRoZSBvbmx5 DQo+ID4gY2FsbGVyIG9mIHRoYXQgZnVuY3Rpb24gaW4gdGhlIFNDU0kgY29yZSBpcyBzY3NpX2lu aXRpYWxpemVfcnEoKS4gVGhhdCBmdW5jdGlvbg0KPiA+IGhhcyB0d28gY2FsbGVycywgbmFtZWx5 IHNjc2lfaW5pdF9jb21tYW5kKCkgYW5kIGJsa19nZXRfcmVxdWVzdCgpLiBIb3dldmVyLA0KPiA+ IHRoZSBzY3NpX2NtbmQuZGV2aWNlIHBvaW50ZXIgaXMgbm90IGNsZWFyZWQgd2hlbiBhIHJlcXVl c3QgZmluaXNoZXMuIFRoaXMgaXMNCj4gPiB3aHkgSSB0aGluayB0aGF0IHRoZSBhYm92ZSBjcmFz aCByZXBvcnQgaW5kaWNhdGVzIHRoYXQgc2NzaV90aW1lc19vdXQoKSB3YXMNCj4gPiBjYWxsZWQg Zm9yIGEgcmVxdWVzdCB0aGF0IHdhcyBiZWluZyByZWluaXRpYWxpemVkIGFuZCBub3QgYnkgZGV2 aWNlIGhvdHBsdWdnaW5nLg0KPiANCj4gSSBjb3VsZCBiZSBtaXNyZWFkaW5nIGl0IGJ1dCBzY3Np X2NtbmQtPmRldmljZSBkZXJlZmVyZW5jZSBzaG91bGQgYmUNCj4gdGhlIGZvbGxvd2luZy4NCj4g DQo+ICAgICAweDAwMDAwMDAwMDAwMDViZGQgPCsxMz46ICAgIG1vdiAgICAweDFiMCglcmRpKSwl cmF4DQo+IA0KPiAlcmRpIGlzIEByZXEsIDB4MWIwKCVyZGkpIHNlZW1zIHRvIGJlIHRoZSBjb21i aW5lZCBhcml0aG1ldGljIG9mDQo+IGJsa19tcV9ycV90b19wZHUoKSBhbmQgLT5kZXZpY2UgZGVy ZWZlcmVuY2UgLSAweDE3OCArIDB4MzguICBUaGUNCj4gZmF1bHRpbmcgYWNjZXNzIGlzICglcmF4 KSwgd2hpY2ggaXMgZGVyZWYnaW5nIGhvc3QgZnJvbSBkZXZpY2UuDQoNCkhlbGxvIFRlanVuLA0K DQpJIHRoaW5rICJkZXJlZmVyZW5jaW5nIGEgcG9pbnRlciIgbWVhbnMgcmVhZGluZyB0aGUgbWVt b3J5IGxvY2F0aW9uIHRoYXQgcG9pbnRlciBwb2ludHMNCmF0PyBBbnl3YXksIEkgdGhpbmsgd2Ug Ym90aCBpbnRlcnByZXQgdGhlIGNyYXNoIHJlcG9ydCBpbiB0aGUgc2FtZSB3YXksIG5hbWVseSB0 aGF0IGl0DQptZWFucyB0aGF0IHNjbWQtPmRldmljZSA9PSBOVUxMLg0KDQpUaGFua3MsDQoNCkJh cnQuDQoNCg0KDQo=