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Sun, 26 Apr 2020 01:04:06 -0700 (PDT) X-Gm-Message-State: AGi0PuY/Q4G5Kbv0kT5D/j6yM3796Jye2ROFqxMNb6WxlauIogwzKOpm Chh8flTvy6Jx6V3nvmHKruDZKHTIcePM/r9Zyw== X-Google-Smtp-Source: APiQypI41ZgtUmbcPsFD/aQIGzgLUAlW+VK1CXBcWhrzELEevx/EHxwq4GUoRPrYvidlr2de35GPe+5uokqoXF6ePxE= X-Received: by 2002:a50:ea87:: with SMTP id d7mr8373594edo.48.1587888244933; Sun, 26 Apr 2020 01:04:04 -0700 (PDT) MIME-Version: 1.0 References: <20200420060834.44461-1-amistry@google.com> In-Reply-To: <20200420060834.44461-1-amistry@google.com> From: Chun-Kuang Hu Date: Sun, 26 Apr 2020 16:03:53 +0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH] drm/mediatek: stop iterating dma addresses when sg_dma_len() == 0 To: Anand K Mistry X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200426_010407_538516_DD63A748 X-CRM114-Status: GOOD ( 13.92 ) 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: Anand K Mistry , DRI Development , CK Hu , "moderated list:ARM/Mediatek SoC support" , Matthias Brugger , Linux ARM 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 SGksIEFuYW5kOgoKQW5hbmQgSyBNaXN0cnkgPGFtaXN0cnlAY2hyb21pdW0ub3JnPiDmlrwgMjAy MOW5tDTmnIgyMOaXpSDpgLHkuIAg5LiL5Y2IMjowOeWvq+mBk++8mgo+Cj4gSWYgZG1hX21hcF9z ZygpIG1lcmdlcyBwYWdlcyB3aGVuIGNyZWF0aW5nIHRoZSBtYXBwaW5nLCBvbmx5IHRoZSBmaXJz dAo+IGVudHJpZXMgd2lsbCBoYXZlIGEgdmFsaWQgc2dfZG1hX2FkZHJlc3MoKSBhbmQgc2dfZG1h X2xlbigpLCBmb2xsb3dlZCBieQo+IGVudHJpZXMgd2l0aCBzZ19kbWFfbGVuKCkgPT0gMC4KPgo+ IFNpZ25lZC1vZmYtYnk6IEFuYW5kIEsgTWlzdHJ5IDxhbWlzdHJ5QGdvb2dsZS5jb20+Cj4gLS0t Cj4gIGRyaXZlcnMvZ3B1L2RybS9tZWRpYXRlay9tdGtfZHJtX2dlbS5jIHwgMyArKysKPiAgMSBm aWxlIGNoYW5nZWQsIDMgaW5zZXJ0aW9ucygrKQo+Cj4gZGlmZiAtLWdpdCBhL2RyaXZlcnMvZ3B1 L2RybS9tZWRpYXRlay9tdGtfZHJtX2dlbS5jIGIvZHJpdmVycy9ncHUvZHJtL21lZGlhdGVrL210 a19kcm1fZ2VtLmMKPiBpbmRleCBiMDRhM2MyYjExMWUwOS4uZjhmZDhiOThjMzBlM2QgMTAwNjQ0 Cj4gLS0tIGEvZHJpdmVycy9ncHUvZHJtL21lZGlhdGVrL210a19kcm1fZ2VtLmMKPiArKysgYi9k cml2ZXJzL2dwdS9kcm0vbWVkaWF0ZWsvbXRrX2RybV9nZW0uYwo+IEBAIC0yMjQsNiArMjI0LDkg QEAgc3RydWN0IGRybV9nZW1fb2JqZWN0ICptdGtfZ2VtX3ByaW1lX2ltcG9ydF9zZ190YWJsZShz dHJ1Y3QgZHJtX2RldmljZSAqZGV2LAo+Cj4gICAgICAgICBleHBlY3RlZCA9IHNnX2RtYV9hZGRy ZXNzKHNnLT5zZ2wpOwo+ICAgICAgICAgZm9yX2VhY2hfc2coc2ctPnNnbCwgcywgc2ctPm5lbnRz LCBpKSB7Cj4gKyAgICAgICAgICAgICAgIGlmICghc2dfZG1hX2xlbihzKSkKPiArICAgICAgICAg ICAgICAgICAgICAgICBicmVhazsKCkkgdGhpbmsgdGhpcyBzaG91bGQgYmUgJ2NvbnRpbnVlJwoK UmVnYXJkcywKQ2h1bi1LdWFuZy4KCj4gKwo+ICAgICAgICAgICAgICAgICBpZiAoc2dfZG1hX2Fk ZHJlc3MocykgIT0gZXhwZWN0ZWQpIHsKPiAgICAgICAgICAgICAgICAgICAgICAgICBEUk1fRVJS T1IoInNnX3RhYmxlIGlzIG5vdCBjb250aWd1b3VzIik7Cj4gICAgICAgICAgICAgICAgICAgICAg ICAgcmV0ID0gLUVJTlZBTDsKPiAtLQo+IDIuMjYuMS4zMDEuZzU1YmMzZWI3Y2I5LWdvb2cKPgo+ Cj4gX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KPiBMaW51 eC1tZWRpYXRlayBtYWlsaW5nIGxpc3QKPiBMaW51eC1tZWRpYXRla0BsaXN0cy5pbmZyYWRlYWQu b3JnCj4gaHR0cDovL2xpc3RzLmluZnJhZGVhZC5vcmcvbWFpbG1hbi9saXN0aW5mby9saW51eC1t ZWRpYXRlawoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18K bGludXgtYXJtLWtlcm5lbCBtYWlsaW5nIGxpc3QKbGludXgtYXJtLWtlcm5lbEBsaXN0cy5pbmZy YWRlYWQub3JnCmh0dHA6Ly9saXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4vbGlzdGluZm8vbGlu dXgtYXJtLWtlcm5lbAo=