From mboxrd@z Thu Jan 1 00:00:00 1970 From: Subject: Re: [PATCH 3/3] net: macb: add missing barriers when reading buffers Date: Thu, 6 Dec 2018 14:14:02 +0000 Message-ID: References: <20181130182137.27974-1-anssi.hannula@bitwise.fi> <20181130182137.27974-4-anssi.hannula@bitwise.fi> <6378cbaf-2c8d-3c22-2d2d-632c32c6195a@microchip.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Cc: , , To: Return-path: Received: from esa6.microchip.iphmx.com ([216.71.154.253]:47105 "EHLO esa6.microchip.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727737AbeLFOOH (ORCPT ); Thu, 6 Dec 2018 09:14:07 -0500 In-Reply-To: Content-Language: en-US Content-ID: Sender: netdev-owner@vger.kernel.org List-ID: SGkgQW5zc2ksDQoNCk9uIDA1LjEyLjIwMTggMTY6MDAsIEFuc3NpIEhhbm51bGEgd3JvdGU6DQo+ IE9uIDUuMTIuMjAxOCAxNDozNywgQ2xhdWRpdS5CZXpuZWFAbWljcm9jaGlwLmNvbSB3cm90ZToN Cj4+DQo+PiBPbiAzMC4xMS4yMDE4IDIwOjIxLCBBbnNzaSBIYW5udWxhIHdyb3RlOg0KPj4+IFdo ZW4gcmVhZGluZyBidWZmZXIgZGVzY3JpcHRvcnMgb24gUlggb3Igb24gVFggY29tcGxldGlvbiwg YW4NCj4+PiBSWF9VU0VEL1RYX1VTRUQgYml0IGlzIGNoZWNrZWQgZmlyc3QgdG8gZW5zdXJlIHRo YXQgdGhlIGRlc2NyaXB0b3IgaGFzDQo+Pj4gYmVlbiBwb3B1bGF0ZWQuIEhvd2V2ZXIsIHRoZXJl IGFyZSBubyBtZW1vcnkgYmFycmllcnMgdG8gZW5zdXJlIHRoYXQgdGhlDQo+Pj4gZGF0YSBwcm90 ZWN0ZWQgYnkgdGhlIFJYX1VTRUQvVFhfVVNFRCBiaXQgaXMgdXAtdG8tZGF0ZSB3aXRoIHJlc3Bl Y3QgdG8NCj4+PiB0aGF0IGJpdC4NCj4+Pg0KPj4+IEZpeCB0aGF0IGJ5IGFkZGluZyBETUEgcmVh ZCBtZW1vcnkgYmFycmllcnMgb24gdGhvc2UgcGF0aHMuDQo+Pj4NCj4+PiBJIGRpZCBub3Qgb2Jz ZXJ2ZSBhbnkgYWN0dWFsIGlzc3VlcyBjYXVzZWQgYnkgdGhlc2UgYmVpbmcgbWlzc2luZywNCj4+ PiB0aG91Z2guDQo+Pj4NCj4+PiBUZXN0ZWQgb24gYSBaeW5xTVAgYmFzZWQgc3lzdGVtLg0KPj4+ DQo+Pj4gU2lnbmVkLW9mZi1ieTogQW5zc2kgSGFubnVsYSA8YW5zc2kuaGFubnVsYUBiaXR3aXNl LmZpPg0KPj4+IEZpeGVzOiA4OWU1Nzg1ZmM4YTYgKCJbUEFUQ0hdIEF0bWVsIE1BQ0IgZXRoZXJu ZXQgZHJpdmVyIikNCj4+PiBDYzogTmljb2xhcyBGZXJyZSA8bmljb2xhcy5mZXJyZUBtaWNyb2No aXAuY29tPg0KPj4+IC0tLQ0KPj4+ICBkcml2ZXJzL25ldC9ldGhlcm5ldC9jYWRlbmNlL21hY2Jf bWFpbi5jIHwgMjAgKysrKysrKysrKysrKysrKy0tLS0NCj4+PiAgMSBmaWxlIGNoYW5nZWQsIDE2 IGluc2VydGlvbnMoKyksIDQgZGVsZXRpb25zKC0pDQo+Pj4NCj4+PiBkaWZmIC0tZ2l0IGEvZHJp dmVycy9uZXQvZXRoZXJuZXQvY2FkZW5jZS9tYWNiX21haW4uYyBiL2RyaXZlcnMvbmV0L2V0aGVy bmV0L2NhZGVuY2UvbWFjYl9tYWluLmMNCj4+PiBpbmRleCA0MzBiN2EwZjU0MzYuLmM5M2JhYTg2 MjFkNSAxMDA2NDQNCj4+PiAtLS0gYS9kcml2ZXJzL25ldC9ldGhlcm5ldC9jYWRlbmNlL21hY2Jf bWFpbi5jDQo+Pj4gKysrIGIvZHJpdmVycy9uZXQvZXRoZXJuZXQvY2FkZW5jZS9tYWNiX21haW4u Yw0KPj4+IEBAIC04NjEsNiArODYxLDExIEBAIHN0YXRpYyB2b2lkIG1hY2JfdHhfaW50ZXJydXB0 KHN0cnVjdCBtYWNiX3F1ZXVlICpxdWV1ZSkNCj4+PiAgDQo+Pj4gIAkJCS8qIEZpcnN0LCB1cGRh dGUgVFggc3RhdHMgaWYgbmVlZGVkICovDQo+Pj4gIAkJCWlmIChza2IpIHsNCj4+PiArCQkJCS8q IEVuc3VyZSBhbGwgb2YgZGVzYyBpcyBhdCBsZWFzdCBhcyB1cC10by1kYXRlDQo+Pj4gKwkJCQkg KiBhcyBjdHJsIChUWF9VU0VEIGJpdCkNCj4+PiArCQkJCSAqLw0KPj4+ICsJCQkJZG1hX3JtYigp Ow0KPj4+ICsNCj4+IElzIHRoaXMgbmVjZXNzYXJ5PyBXb3VsZG4ndCBwcmV2aW91cyBybWIoKSB0 YWtlIGNhcmUgb2YgdGhpcz8gQXQgdGhpcyB0aW1lDQo+PiBkYXRhIHNwZWNpZmljIHRvIHRoaXMg ZGVzY3JpcHRvciB3YXMgY29tcGxldGVkLiBUaGUgVFggZGVzY3JpcHRvcnMgZm9yIG5leHQNCj4+ IGRhdGEgdG8gYmUgc2VuZCBpcyB1cGRhdGVkIHVuZGVyIGEgbG9ja2VkIHNwaW5sb2NrLg0KPiAN Cj4gVGhlIHByZXZpb3VzIHJtYigpIGlzIGJlZm9yZSB0aGUgVFhfVVNFRCBjaGVjaywgc28gbXkg dW5kZXJzdGFuZGluZyBpcw0KPiB0aGF0IHRoZSBmb2xsb3dpbmcgY291bGQgaGFwcGVuIGluIHRo ZW9yeToNCg0KV2UgYXJlIHVzaW5nIHRoaXMgSVAgb24gYW5kIEFSTSBhcmNoaXRlY3R1cmUsIHNv LCB3aXRoIHJlZ2FyZHMgdG8gcm1iKCksIEkNCnVuZGVyc3RhbmQgZnJvbSBbMV0gdGhhdCBkc2Ig Y29tcGxldGVzIHdoZW46DQoiQWxsIGV4cGxpY2l0IG1lbW9yeSBhY2Nlc3NlcyBiZWZvcmUgdGhp cyBpbnN0cnVjdGlvbiBjb21wbGV0ZS4NCkFsbCBDYWNoZSwgQnJhbmNoIHByZWRpY3RvciBhbmQg VExCIG1haW50ZW5hbmNlIG9wZXJhdGlvbnMgYmVmb3JlIHRoaXMNCmluc3RydWN0aW9uIGNvbXBs ZXRlLiINCg0KPiANCj4gMS4gcm1iKCkuDQpBY2NvcmRpbmcgdG8gWzFdIHRoaXMgc2hvdWxkIGVu ZCBhZnRlciBhbGwgcHJldmlvdXMgaW5zdHJ1Y3Rpb25zIChsb2FkcywNCnN0b3JlcykgZW5kcy4N Cg0KPiAyLiBSZWFkcyBhcmUgcmVvcmRlcmVkIHNvIHRoYXQgVFggdGltZXN0YW1wIGlzIHJlYWQg Zmlyc3QgLSBubyBiYXJyaWVycw0KPiBhcmUgY3Jvc3NlZC4NCg0KQnV0LCBhcyBwZXIgWzFdLCBu byBvbndhcmQgaW5zdHJ1Y3Rpb24gd2lsbCBiZSByZWFjaGVkIHVudGlsIGFsbA0KaW5zdHJ1Y3Rp b24gcHJpb3IgdG8gZHNiIGVuZHMsIHNvLCBhZnRlciBybWIoKSBhbGwgZGVzY3JpcHRvcidzIG1l bWJlcnMNCnNob3VsZCBiZSB1cGRhdGVkLCByaWdodD8NCg0KPiAzLiBIVyB3cml0ZXMgdGltZXN0 YW1wIGFuZCBzZXRzIFRYX1VTRUQgKG9yIHRoZXkgYmVjb21lIHZpc2libGUpLg0KDQpJIGV4cGVj dCBoYXJkd2FyZSB0byBzZXQgVFhfVVNFRCBhbmQgdGltZXN0YW1wIGJlZm9yZSByYWlzaW5nIFRY IGNvbXBsZXRlDQppbnRlcnJ1cHQuIElmIHNvLCB0aGVyZSBzaG91bGQgYmUgbm8gb24tZmxpZ2h0 IHVwZGF0ZXMgb2YgdGhpcyBkZXNjcmlwdG9yLA0KcmlnaHQ/IEhhcmR3YXJlIHJhaXNlZCBhIFRY X1VTRUQgYml0IHJlYWQgaW50ZXJydXB0IHdoZW4gaXQgcmVhZHMgYQ0KZGVzY3JpcHRvciBsaWtl IHRoaXMgYW5kIGhhbmdzIFRYLg0KDQo+IDQuIENvZGUgY2hlY2tzIFRYX1VTRUQuDQo+IDUuIENv ZGUgb3BlcmF0ZXMgb24gdGltZXN0YW1wIHRoYXQgaXMgYWN0dWFsbHkgZ2FyYmFnZS4NCj4gDQo+ IEknbSBub3QgMTAwJSBzdXJlIHRoYXQgdGhlcmUgaXNuJ3Qgc29tZSBsaWdodGVyL2NsZWFuZXIg d2F5IHRvIGRvIHRoaXMNCj4gdGhhbiBkbWFfcm1iKCksIHRob3VnaC4NCg0KSWYgeW91IHN0aWxs IHRoaW5rIHRoaXMgc2NlbmFyaW8gY291bGQgaGFwcGVuIHdoeSBub3QgY2FsbGluZyBhIGRzYiBp bg0KZ2VtX3B0cF9kb190aW1lc3RhbXAoKS4gSSBmZWVsIGxpa2UgdGhhdCBpcyBhIHByb3BlciBw bGFjZSB0byBjYWxsIGl0Lg0KDQpNb3Jlb3ZlciwgdGhlcmUgaXMgYml0IDMyIG9mIGRlc2MtPmN0 cmwgd2hpY2ggdGVsbHMgeW91IGlmIGEgdmFsaWQNCnRpbWVzdGFtcCB3YXMgcGxhY2VkIGluIHRo ZSBkZXNjcmlwdG9yLiBCdXQsIGFnYWluLCBJIGV4cGVjdCB0aGUgdGltZXN0YW1wDQphbmQgVFhf VVNFRCB0byBiZSBzZXQgYnkgaGFyZHdhcmUgYmVmb3JlIHJhaXNpbmcgVFggY29tcGxldGUgaW50 ZXJydXB0Lg0KDQpbMV0NCmh0dHA6Ly9pbmZvY2VudGVyLmFybS5jb20vaGVscC9pbmRleC5qc3A/ dG9waWM9L2NvbS5hcm0uZG9jLmR1aTA0ODljL0NJSEdISElFLmh0bWwNCg0KPiANCj4+PiAgCQkJ CWlmIChnZW1fcHRwX2RvX3R4c3RhbXAocXVldWUsIHNrYiwgZGVzYykgPT0gMCkgew0KPj4+ICAJ CQkJCS8qIHNrYiBub3cgYmVsb25ncyB0byB0aW1lc3RhbXAgYnVmZmVyDQo+Pj4gIAkJCQkJICog YW5kIHdpbGwgYmUgcmVtb3ZlZCBsYXRlcg0KPj4+IEBAIC0xMDAwLDEyICsxMDA1LDE2IEBAIHN0 YXRpYyBpbnQgZ2VtX3J4KHN0cnVjdCBtYWNiX3F1ZXVlICpxdWV1ZSwgaW50IGJ1ZGdldCkNCj4+ PiAgCQlybWIoKTsNCj4+PiAgDQo+Pj4gIAkJcnh1c2VkID0gKGRlc2MtPmFkZHIgJiBNQUNCX0JJ VChSWF9VU0VEKSkgPyB0cnVlIDogZmFsc2U7DQo+Pj4gLQkJYWRkciA9IG1hY2JfZ2V0X2FkZHIo YnAsIGRlc2MpOw0KPj4+IC0JCWN0cmwgPSBkZXNjLT5jdHJsOw0KPj4+ICANCj4+PiAgCQlpZiAo IXJ4dXNlZCkNCj4+PiAgCQkJYnJlYWs7DQo+Pj4gIA0KPj4+ICsJCS8qIEVuc3VyZSBvdGhlciBk YXRhIGlzIGF0IGxlYXN0IGFzIHVwLXRvLWRhdGUgYXMgcnh1c2VkICovDQo+Pj4gKwkJZG1hX3Jt YigpOw0KPj4gU2FtZSBoZXJlLCB3b3VsZG4ndCBwcmV2aW91cyBybWIoKSBzaG91bGQgZG8gdGhp cyBqb2I/DQo+IA0KPiBUaGUgc2NlbmFyaW8gSSdtIGNvbmNlcm5lZCBhYm91dCBoZXJlIChhbmQg aW4gdGhlIGxhc3QgaHVuaykgaXM6DQo+IA0KPiAxLiBybWIoKS4NCj4gMi4gY3RybCBpcyByZWFk IChpLmUuIGN0cmwgcmVhZCByZW9yZGVyZWQgYmVmb3JlIGFkZHIgcmVhZCkuDQoNClNhbWUgaGVy ZSB3aXRoIHJlZ2FyZHMgdG8gWzFdLiBBbGwgcHJpb3IgbG9hZHMsIHN0b3JlcyBzaG91bGQgYmUg ZmluaXNoZWQNCndoZW4gZHNiIGVuZHMuDQoNCj4gMy4gSFcgdXBkYXRlcyB0byBjdHJsIGFuZCBh ZGRyIGJlY29tZSB2aXNpYmxlLg0KPiA0LiBSWF9VU0VEIGNoZWNrLg0KPiA1LiBjb2RlIG9wZXJh dGVzIG9uIGdhcmJhZ2UgY3RybC4NCg0KSWYgdGhpcyBpcyBoYXBwZW4gdGhlbiB0aGUgZGF0YSB3 aWxsIGJlIHJlYWQgb24gbmV4dCBpbnRlcnJ1cHQuDQoNCmRtYV9ybWIoKSBpcyBhIGRtYi4gQWNj b3JkaW5nIHRvIFsxXToNCiJEYXRhIE1lbW9yeSBCYXJyaWVyIGFjdHMgYXMgYSBtZW1vcnkgYmFy cmllci4gSXQgZW5zdXJlcyB0aGF0IGFsbCBleHBsaWNpdA0KbWVtb3J5IGFjY2Vzc2VzIHRoYXQg YXBwZWFyIGluIHByb2dyYW0gb3JkZXIgYmVmb3JlIHRoZSBETUIgaW5zdHJ1Y3Rpb24gYXJlDQpv YnNlcnZlZCBiZWZvcmUgYW55IGV4cGxpY2l0IG1lbW9yeSBhY2Nlc3NlcyB0aGF0IGFwcGVhciBp biBwcm9ncmFtIG9yZGVyDQphZnRlciB0aGUgRE1CIGluc3RydWN0aW9uLiBJdCBkb2VzIG5vdCBh ZmZlY3QgdGhlIG9yZGVyaW5nIG9mIGFueSBvdGhlcg0KaW5zdHJ1Y3Rpb25zIGV4ZWN1dGluZyBv biB0aGUgcHJvY2Vzc29yLiINCg0KYW5kIHlvdXIgY29kZSBpczoNCg0KCQkvKiBFbnN1cmUgb3Ro ZXIgZGF0YSBpcyBhdCBsZWFzdCBhcyB1cC10by1kYXRlIGFzIHJ4dXNlZCAqLw0KCQlkbWFfcm1i KCk7DQoNCgkJYWRkciA9IG1hY2JfZ2V0X2FkZHIoYnAsIGRlc2MpOw0KCQljdHJsID0gZGVzYy0+ Y3RybDsNCg0KSSB1bmRlcnN0YW5kIGZyb20gdGhpcyB0aGF0IHlvdSB3YW50IHRvIHdhaXQgZm9y IGluc3RydWN0aW9ucyBwcmlvciB0bw0KZG1hX3JtYigpIHRvIGJlIGZpbmlzaGVkPw0KDQo+IA0K PiBJIHRoaW5rIGl0IG1heSBiZSBPSyB0byBtb3ZlIHRoZSBlYXJsaWVyIHJtYigpIG91dHNpZGUg dGhlIGxvb3Agc28gdGhhdA0KPiB0aGVyZSBpcyBhbiBybWIoKSBvbmx5IGJlZm9yZSBhbmQgYWZ0 ZXIgdGhlIFJYIGxvb3AsIGFzIEkgZG9uJ3QgYXQgbGVhc3QNCj4gaW1tZWRpYXRlbHkgc2VlIGFu eSBoYXJkIHJlcXVpcmVtZW50IHRvIGRvIGl0IG9uIGVhY2ggbG9vcCBwYXNzICh1bmxpa2UNCj4g dGhlIGFkZGVkIGRtYV9ybWIoKSkuIEJ1dCBteSBpbnRlbnQgd2FzIHRvIGZpeCBpc3N1ZXMgaW5z dGVhZCBvZg0KPiBvcHRpbWl6YXRpb24gc28gSSBkaWRuJ3QgbG9vayB0b28gY2xvc2VseSBpbnRv IHRoYXQuDQoNCkJ1dCB5b3Ugc2FpZCB5b3UgZGlkIG5vdCBzZWUgYW55IGlzc3VlcyB3aXRoIHRo ZSBjb2RlIGFzIGl0IHdhcyBwcmV2aW91c2x5Lg0KDQpUaGFuayB5b3UsDQpDbGF1ZGl1IEJlem5l YQ0KDQo+IA0KPj4+ICsNCj4+PiArCQlhZGRyID0gbWFjYl9nZXRfYWRkcihicCwgZGVzYyk7DQo+ Pj4gKwkJY3RybCA9IGRlc2MtPmN0cmw7DQo+Pj4gKw0KPj4+ICAJCXF1ZXVlLT5yeF90YWlsKys7 DQo+Pj4gIAkJY291bnQrKzsNCj4+PiAgDQo+Pj4gQEAgLTExODAsMTEgKzExODksMTQgQEAgc3Rh dGljIGludCBtYWNiX3J4KHN0cnVjdCBtYWNiX3F1ZXVlICpxdWV1ZSwgaW50IGJ1ZGdldCkNCj4+ PiAgCQkvKiBNYWtlIGh3IGRlc2NyaXB0b3IgdXBkYXRlcyB2aXNpYmxlIHRvIENQVSAqLw0KPj4+ ICAJCXJtYigpOw0KPj4+ICANCj4+PiAtCQljdHJsID0gZGVzYy0+Y3RybDsNCj4+PiAtDQo+Pj4g IAkJaWYgKCEoZGVzYy0+YWRkciAmIE1BQ0JfQklUKFJYX1VTRUQpKSkNCj4+PiAgCQkJYnJlYWs7 DQo+Pj4gIA0KPj4+ICsJCS8qIEVuc3VyZSBvdGhlciBkYXRhIGlzIGF0IGxlYXN0IGFzIHVwLXRv LWRhdGUgYXMgYWRkciAqLw0KPj4+ICsJCWRtYV9ybWIoKTsNCj4+IERpdHRvDQo+Pg0KPj4+ICsN Cj4+PiArCQljdHJsID0gZGVzYy0+Y3RybDsNCj4+PiArDQo+Pj4gIAkJaWYgKGN0cmwgJiBNQUNC X0JJVChSWF9TT0YpKSB7DQo+Pj4gIAkJCWlmIChmaXJzdF9mcmFnICE9IC0xKQ0KPj4+ICAJCQkJ ZGlzY2FyZF9wYXJ0aWFsX2ZyYW1lKHF1ZXVlLCBmaXJzdF9mcmFnLCB0YWlsKTsNCj4+Pg0KPiAN Cg==