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[209.85.166.43]) by smtp.gmail.com with ESMTPSA id j20sm5943302ile.41.2020.04.27.18.54.39 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 27 Apr 2020 18:54:39 -0700 (PDT) Received: by mail-io1-f43.google.com with SMTP id y26so11272174ioj.2 for ; Mon, 27 Apr 2020 18:54:39 -0700 (PDT) X-Received: by 2002:a6b:9088:: with SMTP id s130mr23613954iod.122.1588038879127; Mon, 27 Apr 2020 18:54:39 -0700 (PDT) MIME-Version: 1.0 References: <20200420060834.44461-1-amistry@google.com> In-Reply-To: From: "Anand K. Mistry" Date: Tue, 28 Apr 2020 11:54:28 +1000 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH] drm/mediatek: stop iterating dma addresses when sg_dma_len() == 0 To: Chun-Kuang Hu X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200427_185443_160636_BC8811BE X-CRM114-Status: GOOD ( 17.24 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Matthias Brugger , CK Hu , "moderated list:ARM/Mediatek SoC support" , Linux ARM , DRI Development Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gU3VuLCAyNiBBcHIgMjAyMCBhdCAxODowNCwgQ2h1bi1LdWFuZyBIdSA8Y2h1bmt1YW5nLmh1 QGtlcm5lbC5vcmc+IHdyb3RlOgo+Cj4gSGksIEFuYW5kOgo+Cj4gQW5hbmQgSyBNaXN0cnkgPGFt aXN0cnlAY2hyb21pdW0ub3JnPiDmlrwgMjAyMOW5tDTmnIgyMOaXpSDpgLHkuIAg5LiL5Y2IMjow OeWvq+mBk++8mgo+ID4KPiA+IElmIGRtYV9tYXBfc2coKSBtZXJnZXMgcGFnZXMgd2hlbiBjcmVh dGluZyB0aGUgbWFwcGluZywgb25seSB0aGUgZmlyc3QKPiA+IGVudHJpZXMgd2lsbCBoYXZlIGEg dmFsaWQgc2dfZG1hX2FkZHJlc3MoKSBhbmQgc2dfZG1hX2xlbigpLCBmb2xsb3dlZCBieQo+ID4g ZW50cmllcyB3aXRoIHNnX2RtYV9sZW4oKSA9PSAwLgo+ID4KPiA+IFNpZ25lZC1vZmYtYnk6IEFu YW5kIEsgTWlzdHJ5IDxhbWlzdHJ5QGdvb2dsZS5jb20+Cj4gPiAtLS0KPiA+ICBkcml2ZXJzL2dw dS9kcm0vbWVkaWF0ZWsvbXRrX2RybV9nZW0uYyB8IDMgKysrCj4gPiAgMSBmaWxlIGNoYW5nZWQs IDMgaW5zZXJ0aW9ucygrKQo+ID4KPiA+IGRpZmYgLS1naXQgYS9kcml2ZXJzL2dwdS9kcm0vbWVk aWF0ZWsvbXRrX2RybV9nZW0uYyBiL2RyaXZlcnMvZ3B1L2RybS9tZWRpYXRlay9tdGtfZHJtX2dl bS5jCj4gPiBpbmRleCBiMDRhM2MyYjExMWUwOS4uZjhmZDhiOThjMzBlM2QgMTAwNjQ0Cj4gPiAt LS0gYS9kcml2ZXJzL2dwdS9kcm0vbWVkaWF0ZWsvbXRrX2RybV9nZW0uYwo+ID4gKysrIGIvZHJp dmVycy9ncHUvZHJtL21lZGlhdGVrL210a19kcm1fZ2VtLmMKPiA+IEBAIC0yMjQsNiArMjI0LDkg QEAgc3RydWN0IGRybV9nZW1fb2JqZWN0ICptdGtfZ2VtX3ByaW1lX2ltcG9ydF9zZ190YWJsZShz dHJ1Y3QgZHJtX2RldmljZSAqZGV2LAo+ID4KPiA+ICAgICAgICAgZXhwZWN0ZWQgPSBzZ19kbWFf YWRkcmVzcyhzZy0+c2dsKTsKPiA+ICAgICAgICAgZm9yX2VhY2hfc2coc2ctPnNnbCwgcywgc2ct Pm5lbnRzLCBpKSB7Cj4gPiArICAgICAgICAgICAgICAgaWYgKCFzZ19kbWFfbGVuKHMpKQo+ID4g KyAgICAgICAgICAgICAgICAgICAgICAgYnJlYWs7Cj4KPiBJIHRoaW5rIHRoaXMgc2hvdWxkIGJl ICdjb250aW51ZScKCnNjYXR0ZXJsaXN0LmggaGFzIHRoZSBjb21tZW50OgovKgogKiBUaGVzZSBt YWNyb3Mgc2hvdWxkIGJlIHVzZWQgYWZ0ZXIgYSBkbWFfbWFwX3NnIGNhbGwgaGFzIGJlZW4gZG9u ZQogKiB0byBnZXQgYnVzIGFkZHJlc3NlcyBvZiBlYWNoIG9mIHRoZSBTRyBlbnRyaWVzIGFuZCB0 aGVpciBsZW5ndGhzLgogKiBZb3Ugc2hvdWxkIG9ubHkgd29yayB3aXRoIHRoZSBudW1iZXIgb2Yg c2cgZW50cmllcyBkbWFfbWFwX3NnCiAqIHJldHVybnMsIG9yIGFsdGVybmF0aXZlbHkgc3RvcCBv biB0aGUgZmlyc3Qgc2dfZG1hX2xlbihzZykgd2hpY2gKICogaXMgMC4KICovCgpTbyBicmVha2lu ZyBvbiB0aGUgZmlyc3Qgc2dfZG1hX2xlbihzZykgPT0gMCBhcHBlYXJzIHRvIGJlIChvbmUgb2Yp CnRoZSBkb2N1bWVudGVkIGFwcHJvYWNoLgoKPgo+IFJlZ2FyZHMsCj4gQ2h1bi1LdWFuZy4KPgo+ ID4gKwo+ID4gICAgICAgICAgICAgICAgIGlmIChzZ19kbWFfYWRkcmVzcyhzKSAhPSBleHBlY3Rl ZCkgewo+ID4gICAgICAgICAgICAgICAgICAgICAgICAgRFJNX0VSUk9SKCJzZ190YWJsZSBpcyBu b3QgY29udGlndW91cyIpOwo+ID4gICAgICAgICAgICAgICAgICAgICAgICAgcmV0ID0gLUVJTlZB TDsKPiA+IC0tCj4gPiAyLjI2LjEuMzAxLmc1NWJjM2ViN2NiOS1nb29nCj4gPgo+ID4KPiA+IF9f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCj4gPiBMaW51eC1t ZWRpYXRlayBtYWlsaW5nIGxpc3QKPiA+IExpbnV4LW1lZGlhdGVrQGxpc3RzLmluZnJhZGVhZC5v cmcKPiA+IGh0dHA6Ly9saXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4vbGlzdGluZm8vbGludXgt bWVkaWF0ZWsKCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f CmxpbnV4LWFybS1rZXJuZWwgbWFpbGluZyBsaXN0CmxpbnV4LWFybS1rZXJuZWxAbGlzdHMuaW5m cmFkZWFkLm9yZwpodHRwOi8vbGlzdHMuaW5mcmFkZWFkLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2xp bnV4LWFybS1rZXJuZWwK