From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Jonas Mark (BT-FIR/ENG1)" Subject: Re: [PATCH] eeprom: at24: Fix unexpected timeout under high load Date: Sun, 5 Aug 2018 12:26:47 +0000 Message-ID: Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Content-Language: de-DE Sender: linux-kernel-owner@vger.kernel.org To: Andy Shevchenko , Bartosz Golaszewski Cc: Arnd Bergmann , Greg Kroah-Hartman , linux-i2c , Linux Kernel Mailing List , "WANG Xin (BT-FIR/ENG1-Zhu)" , "Jonas Mark (BT-FIR/ENG1)" List-Id: linux-i2c@vger.kernel.org SGkgQW5keSwNCg0KVGhhbmsgeW91IGZvciB5b3VyIGZlZWRiYWNrLg0KIA0KPiA+IC0jZGVmaW5l IGF0MjRfbG9vcF91bnRpbF90aW1lb3V0KHRvdXQsIG9wX3RpbWUpICAgICAgICAgICAgICAgICAg ICAgICAgIFwNCj4gPiAtICAgICAgIGZvciAodG91dCA9IGppZmZpZXMgKyBtc2Vjc190b19qaWZm aWVzKGF0MjRfd3JpdGVfdGltZW91dCksICAgICBcDQo+ID4gLSAgICAgICAgICAgIG9wX3RpbWUg PSAwOyAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgXA0KPiA+ IC0gICAgICAgICAgICBvcF90aW1lID8gdGltZV9iZWZvcmUob3BfdGltZSwgdG91dCkgOiB0cnVl OyAgICAgICAgICAgICAgIFwNCj4gPiAtICAgICAgICAgICAgdXNsZWVwX3JhbmdlKDEwMDAsIDE1 MDApLCBvcF90aW1lID0gamlmZmllcykNCj4gDQo+IFRoaXMgb25lIHVuZGVyc3RhbmRibGUgYW5k IHJlcHJlc2VudHMgb25lIG9wZXJhdGlvbi4NCg0KSXQganVzdCBoYXMgdGhlIGRvd25zaWRlIHRo YXQgaXQgd2lsbCBub3QgcmV0cnkgaWYgdGhlIHRpbWVvdXQgaXMNCnJlYWNoZWQgYWZ0ZXIgdGhl IHVzbGVlcF9yYW5nZSgpLg0KDQpJZiB5b3UgaGF2ZSBhIHN5c3RlbSB3aGljaCBjb21iaW5lcyBo aWdoIENQVSBsb2FkIHdpdGggcmVwZWF0ZWQgRUVQUk9NDQp3cml0ZXMgeW91IHdpbGwgcnVuIGlu dG8gdGhlIGZvbGxvd2luZyBzY2VuYXJpbzoNCg0KLSBTeXN0ZW0gbWFrZXMgYSBzdWNjZXNzZnVs IHJlZ21hcF9idWxrX3dyaXRlKCkgdG8gRUVQUk9NLg0KLSBTeXN0ZW0gd2FudHMgdG8gcGVyZm9y bSBhbm90aGVyIHdyaXRlIHRvIEVFUFJPTSBidXQgRUVQUk9NIGlzIHN0aWxsDQogIGJ1c3kgd2l0 aCB0aGUgbGFzdCB3cml0ZS4NCi0gQmVjYXVzZSBvZiBoaWdoIENQVSBsb2FkIHRoZSB1c2xlZXBf cmFuZ2UoKSB3aWxsIHNsZWVwIG1vcmUgdGhhbg0KICAyNSBtcyAoYXQyNF93cml0ZV90aW1lb3V0 KS4NCi0gV2l0aGluIHRoZSBvdmVyLWxvbmcgc2xlZXBpbmcgdGhlIEVFUFJPTSBmaW5pc2hlZCB0 aGUgcHJldmlvdXMgd3JpdGUNCiAgb3BlcmF0aW9uIGFuZCBpcyByZWFkeSBhZ2Fpbi4NCi0gYXQy NF9sb29wX3VudGlsX3RpbWVvdXQoKSB3aWxsIGRldGVjdCB0aW1lb3V0IGFuZCB3b24ndCB0cnkg dG8gd3JpdGUuDQoNClRoZSBzY2VuYXJpbyBhYm92ZSBoYXBwZW5zIHZlcnkgb2Z0ZW4gb24gb3Vy IHN5c3RlbSBhbmQgd2UgbmVlZCBhIGZpeC4NCg0KPiA+ICsjZGVmaW5lIGF0MjRfbG9vcF91bnRp bF90aW1lb3V0X2JlZ2luKHRvdXQsIG9wX3RpbWUpICAgICAgICAgICBcDQo+ID4gKyAgICAgICB0 b3V0ID0gamlmZmllcyArIG1zZWNzX3RvX2ppZmZpZXMoYXQyNF93cml0ZV90aW1lb3V0KTsgIFwN Cj4gPiArICAgICAgIHdoaWxlICh0cnVlKSB7ICAgICAgICAgICAgICAgICAgICAgICAgICAgICAg ICAgICAgICAgICAgXA0KPiA+ICsgICAgICAgICAgICAgICBvcF90aW1lID0gamlmZmllczsNCj4g PiArDQo+ID4gKyNkZWZpbmUgYXQyNF9sb29wX3VudGlsX3RpbWVvdXRfZW5kKHRvdXQsIG9wX3Rp bWUpICAgICAgICAgICAgIFwNCj4gPiArICAgICAgICAgICAgICAgaWYgKHRpbWVfYmVmb3JlKHRv dXQsIG9wX3RpbWUpKSAgICAgICAgICAgICAgICAgXA0KPiA+ICsgICAgICAgICAgICAgICAgICAg ICAgIGJyZWFrOyAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICBcDQo+ID4gKyAgICAg ICAgICAgICAgIHVzbGVlcF9yYW5nZSgxMDAwLCAxNTAwKTsgICAgICAgICAgICAgICAgICAgICAg IFwNCj4gPiArICAgICAgIH0NCj4gDQo+IEJlc2lkZXMgYHdoaWxlICh0cnVlKWAsIHdoaWNoIGlz IGEgcmVkIGZsYWcgZm9yIHRpbWVvdXQgbG9vcHMsDQo+IHRoZXNlIGFyZSBkb25lIGluIGFuIGhh Y2sgd2F5LiBKdXN0IG9wZW4gY29kZSB0aGVtIGluIGJvdGggY2FzZXMsIG9yDQo+IHJld3JpdGUg b3JpZ2luYWwgb25lIHRvIGtlZWwgaXQncyBzZW1hbnRpY3MuDQoNCkkgaGF2ZSB0byBhZG1pdCB0 aGF0IEkgYW0gbm90IHN1cmUgd2hhdCB5b3UgbWVhbi4NCg0KV2Uga2VwdCB0aGUgbWFjcm8tc3R5 bGUgb2YgdGhlIGxvb3AgYmVjYXVzZSB3ZSBhc3N1bWVkIGl0IHdhcyBnb29kDQpzdHlsZSBpbiB0 aGlzIGNvbnRleHQuDQoNCldoYXQgZG9lcyAia2VlbCBpdCdzIHNlbWFudGljcyIgbWVhbj8NCg0K V2l0aCAib3BlbiBjb2RlIHRoZW0gaW4gYm90aCBjYXNlcyIgZG8geW91IG1lYW4gdG8gcmlkIG9m IHRoZSBtYWNybw0KYW5kIHRvIGRpcmVjdGx5IHdyaXRlIHRoZSBsb29wIGludG8gdGhlIGNvZGU/ IERvZXMgdGhlIGZvbGxvd2luZw0KbWF0Y2ggeW91ciBwcm9wb3NhbHM/DQoNCnJldCA9IDA7DQp0 b3V0ID0gamlmZmllcyArIG1zZWNzX3RvX2ppZmZpZXMoYXQyNF93cml0ZV90aW1lb3V0KTsNCmRv IHsNCglpZiAocmV0KQ0KCQl1c2xlZXBfcmFuZ2UoMTAwMCwgMTUwMCk7DQoNCglyZWFkX3RpbWUg PSBqaWZmaWVzOw0KDQoJcmV0ID0gcmVnbWFwX2J1bGtfcmVhZChyZWdtYXAsIG9mZnNldCwgYnVm LCBjb3VudCk7DQoJZGV2X2RiZygmY2xpZW50LT5kZXYsICJyZWFkICV6dUAlZCAtLT4gJWQgKCVs ZClcbiIsDQoJCWNvdW50LCBvZmZzZXQsIHJldCwgamlmZmllcyk7DQoJaWYgKCFyZXQpDQoJCXJl dHVybiBjb3VudDsNCn0gd2hpbGUgKCF0aW1lX2JlZm9yZSh0b3V0LCByZWFkX3RpbWUpKQ0KDQpH cmVldGluZ3MsDQpNYXJrDQoNCkJ1aWxkaW5nIFRlY2hub2xvZ2llcywgUGFuZWwgU29mdHdhcmUg RmlyZSAoQlQtRklSL0VORzEpIA0KQm9zY2ggU2ljaGVyaGVpdHNzeXN0ZW1lIEdtYkggfCBQb3N0 ZmFjaCAxMSAxMSB8IDg1NjI2IEdyYXNicnVubiB8IEdFUk1BTlkgfCB3d3cuYm9zY2hzZWN1cml0 eS5jb20NCg0KU2l0ejogU3R1dHRnYXJ0LCBSZWdpc3RlcmdlcmljaHQ6IEFtdHNnZXJpY2h0IFN0 dXR0Z2FydCBIUkIgMjMxMTggDQpBdWZzaWNodHNyYXRzdm9yc2l0emVuZGVyOiBTdGVmYW4gSGFy dHVuZzsgR2VzY2jDpGZ0c2bDvGhydW5nOiBUYW5qYSBSw7xja2VydCwgQW5kcmVhcyBCYXJ0eiwg VGhvbWFzIFF1YW50ZSwgQmVybmhhcmQgU2NodXN0ZXINCg==