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: Wed, 7 Feb 2018 21:02:21 +0000 Message-ID: <1518037339.2870.61.camel@wdc.com> References: <20180207011133.25957-1-bart.vanassche@wdc.com> <20180207170612.GB695913@devbig577.frc2.facebook.com> <1518030233.2870.57.camel@wdc.com> <20180207200951.GE695913@devbig577.frc2.facebook.com> In-Reply-To: <20180207200951.GE695913@devbig577.frc2.facebook.com> Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 List-ID: T24gV2VkLCAyMDE4LTAyLTA3IGF0IDEyOjA5IC0wODAwLCB0akBrZXJuZWwub3JnIHdyb3RlOg0K PiBIZWxsbywNCj4gDQo+IE9uIFdlZCwgRmViIDA3LCAyMDE4IGF0IDA3OjAzOjU2UE0gKzAwMDAs IEJhcnQgVmFuIEFzc2NoZSB3cm90ZToNCj4gPiBJIHRyaWVkIHRoZSBhYm92ZSBwYXRjaCBidXQg YWxyZWFkeSBkdXJpbmcgdGhlIGZpcnN0IGl0ZXJhdGlvbiBvZiB0aGUgdGVzdCBJDQo+ID4gbm90 aWNlZCB0aGF0IHRoZSB0ZXN0IGh1bmcsIHByb2JhYmx5IGR1ZSB0byB0aGUgZm9sbG93aW5nIHJl cXVlc3QgdGhhdCBnb3Qgc3R1Y2s6DQo+ID4gDQo+ID4gJCAoY2QgL3N5cy9rZXJuZWwvZGVidWcv YmxvY2sgJiYgZ3JlcCAtYUggLiAqLyovKi9ycV9saXN0KQ0KPiA+IDAwMDAwMDAwYTk4Y2ZmNjAg ey5vcD1TQ1NJX0lOLCAuY21kX2ZsYWdzPSwgLnJxX2ZsYWdzPU1RX0lORkxJR0hUfFBSRUVNUFR8 UVVJRVR8SU9fU1RBVHxQTSwNCj4gPiAgLnN0YXRlPWlkbGUsIC50YWc9MjIsIC5pbnRlcm5hbF90 YWc9LTEsIC5jbWQ9U3luY2hyb25pemUgQ2FjaGUoMTApIDM1IDAwIDAwIDAwIDAwIDAwLCAucmV0 cmllcz0wLA0KPiA+ICAucmVzdWx0ID0gMHgwLCAuZmxhZ3M9VEFHR0VELCAudGltZW91dD02MC4w MDAsIGFsbG9jYXRlZCA4NzIuNjkwIHMgYWdvfQ0KPiANCj4gSSdtIHdvbmRlciBob3cgdGhpcyBo YXBwZW5lZCwgc28gd2UgY2FuIGxvc2UgYSBjb21wbGV0aW9uIHdoZW4gaXQNCj4gcmFjZXMgYWdh aW5zdCBCTEtfRUhfUkVTRVRfVElNRVI7IGhvd2V2ZXIsIHRoZSBjb21tYW5kIHNob3VsZCB0aW1l b3V0DQo+IGxhdGVyIGN1eiB0aGUgdGltZXIgaXMgcnVubmluZyBhZ2FpbiBub3cuICBNYXliZSB3 ZSBhY3R1YWxseSBoYWQgdGhlDQo+IG1lbW9yeSBiYXJyaWVyIHJhY2UgdGhhdCB5b3UgcG9pbnRl ZCBvdXQgaW4gdGhlIG90aGVyIG1lc3NhZ2U/DQoNCkhlbGxvIFRlanVuLA0KDQpUaGUgcGF0Y2gg dGhhdCBJIHVzZWQgaW4gbXkgdGVzdCBoYWQgYW4gc21wX3dtYigpIGNhbGwgKHNlZSBhbHNvIGJl bG93KS4gQW55d2F5LA0KSSB3aWxsIHNlZSB3aGV0aGVyIEkgY2FuIGV4dHJhY3QgbW9yZSBzdGF0 ZSBpbmZvcm1hdGlvbiB0aHJvdWdoIGRlYnVnZnMuDQoNCmRpZmYgLS1naXQgYS9ibG9jay9ibGst bXEuYyBiL2Jsb2NrL2Jsay1tcS5jDQppbmRleCBlZjRmNmRmMGYxZGYuLjhlYjIxMDVkODJiNyAx MDA2NDQNCi0tLSBhL2Jsb2NrL2Jsay1tcS5jDQorKysgYi9ibG9jay9ibGstbXEuYw0KQEAgLTgy NywxMyArODI3LDkgQEAgc3RhdGljIHZvaWQgYmxrX21xX3JxX3RpbWVkX291dChzdHJ1Y3QgcmVx dWVzdCAqcmVxLCBib29sIHJlc2VydmVkKQ0KIAkJX19ibGtfbXFfY29tcGxldGVfcmVxdWVzdChy ZXEpOw0KIAkJYnJlYWs7DQogCWNhc2UgQkxLX0VIX1JFU0VUX1RJTUVSOg0KLQkJLyoNCi0JCSAq IEFzIG5vdGhpbmcgcHJldmVudHMgZnJvbSBjb21wbGV0aW9uIGhhcHBlbmluZyB3aGlsZQ0KLQkJ ICogLT5hYm9ydGVkX2dzdGF0ZSBpcyBzZXQsIHRoaXMgbWF5IGxlYWQgdG8gaWdub3JlZA0KLQkJ ICogY29tcGxldGlvbnMgYW5kIGZ1cnRoZXIgc3B1cmlvdXMgdGltZW91dHMuDQotCQkgKi8NCi0J CWJsa19tcV9ycV91cGRhdGVfYWJvcnRlZF9nc3RhdGUocmVxLCAwKTsNCiAJCWJsa19hZGRfdGlt ZXIocmVxKTsNCisJCXNtcF93bWIoKTsNCisJCWJsa19tcV9ycV91cGRhdGVfYWJvcnRlZF9nc3Rh dGUocmVxLCAwKTsNCiAJCWJyZWFrOw0KIAljYXNlIEJMS19FSF9OT1RfSEFORExFRDoNCiAJCWJy ZWFrOw0KDQoNCg0K