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[195.135.220.15]) by mx.google.com with ESMTPS id o18si1300753ejn.301.2019.05.28.05.34.50 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 28 May 2019 05:34:50 -0700 (PDT) Received-SPF: pass (google.com: domain of oneukum@suse.com designates 195.135.220.15 as permitted sender) client-ip=195.135.220.15; Authentication-Results: mx.google.com; spf=pass (google.com: domain of oneukum@suse.com designates 195.135.220.15 as permitted sender) smtp.mailfrom=oneukum@suse.com X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 0881DAE86; Tue, 28 May 2019 12:34:50 +0000 (UTC) Message-ID: <1559046886.13873.2.camel@suse.com> Subject: Re: [RFC PATCH] usb: host: xhci: allow __GFP_FS in dma allocation From: Oliver Neukum To: Alan Stern Cc: Jaewon Kim , Christoph Hellwig , linux-mm@kvack.org, gregkh@linuxfoundation.org, Jaewon Kim , m.szyprowski@samsung.com, ytk.lee@samsung.com, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org Date: Tue, 28 May 2019 14:34:46 +0200 In-Reply-To: References: Content-Type: multipart/mixed; boundary="=-I2kQBv2Gth4pqYzgYdi+" X-Mailer: Evolution 3.26.6 Mime-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: --=-I2kQBv2Gth4pqYzgYdi+ Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Am Donnerstag, den 23.05.2019, 10:01 -0400 schrieb Alan Stern: > On Wed, 22 May 2019, Oliver Neukum wrote: > > > On Mi, 2019-05-22 at 10:56 -0400, Alan Stern wrote: > > > On Wed, 22 May 2019, Oliver Neukum wrote: > > > > > > > I agree with the problem, but I fail to see why this issue would be > > > > specific to USB. Shouldn't this be done in the device core layer? > > > > > > Only for drivers that are on the block-device writeback path. The > > > device core doesn't know which drivers these are. > > > > Neither does USB know. It is very hard to predict or even tell which > > devices are block device drivers. I think we must assume that > > any device may be affected. > > All right. Would you like to submit a patch? Do you like this one? Regards Oliver --=-I2kQBv2Gth4pqYzgYdi+ Content-Disposition: attachment; filename="0001-base-force-NOIO-allocations-during-unplug.patch" Content-Transfer-Encoding: base64 Content-Type: text/x-patch; name="0001-base-force-NOIO-allocations-during-unplug.patch"; charset="UTF-8" RnJvbSAwZGM5YzdkZmU5OTRmYzljMjhhNjNiYTI4M2U0NDQyYzIzN2Y2OTg5IE1vbiBTZXAgMTcg MDA6MDA6MDAgMjAwMQpGcm9tOiBPbGl2ZXIgTmV1a3VtIDxvbmV1a3VtQHN1c2UuY29tPgpEYXRl OiBUdWUsIDI4IE1heSAyMDE5IDExOjQzOjAyICswMjAwClN1YmplY3Q6IFtQQVRDSF0gYmFzZTog Zm9yY2UgTk9JTyBhbGxvY2F0aW9ucyBkdXJpbmcgdW5wbHVnCgpUaGVyZSBpcyBvbmUgb3Zlcmxv b2tlZCBzaXR1YXRpb24gdW5kZXIgd2hpY2ggYSBkcml2ZXIKbXVzdCBub3QgZG8gSU8gdG8gYWxs b2NhdGUgbWVtb3J5LiBZb3UgY2Fubm90IGRvIHRoYXQKd2hpbGUgZGlzY29ubmVjdGluZyBhIGRl dmljZS4gQSBkZXZpY2UgYmVpbmcgZGlzY29ubmVjdGVkCmlzIG5vIGxvbmdlciBmdW5jdGlvbmFs IGluIG1vc3QgY2FzZXMsIHlldCBJTyBtYXkgZmFpbApvbmx5IHdoZW4gdGhlIGhhbmRsZXIgcnVu cy4KClNpZ25lZC1vZmYtYnk6IE9saXZlciBOZXVrdW0gPG9uZXVrdW1Ac3VzZS5jb20+Ci0tLQog ZHJpdmVycy9iYXNlL2NvcmUuYyB8IDQgKysrKwogMSBmaWxlIGNoYW5nZWQsIDQgaW5zZXJ0aW9u cygrKQoKZGlmZiAtLWdpdCBhL2RyaXZlcnMvYmFzZS9jb3JlLmMgYi9kcml2ZXJzL2Jhc2UvY29y ZS5jCmluZGV4IGZkNzUxMWUwNGU2Mi4uYTdmNWY0NWJkNzYxIDEwMDY0NAotLS0gYS9kcml2ZXJz L2Jhc2UvY29yZS5jCisrKyBiL2RyaXZlcnMvYmFzZS9jb3JlLmMKQEAgLTIyMjksNiArMjIyOSw3 IEBAIHZvaWQgZGV2aWNlX2RlbChzdHJ1Y3QgZGV2aWNlICpkZXYpCiAJc3RydWN0IGRldmljZSAq cGFyZW50ID0gZGV2LT5wYXJlbnQ7CiAJc3RydWN0IGtvYmplY3QgKmdsdWVfZGlyID0gTlVMTDsK IAlzdHJ1Y3QgY2xhc3NfaW50ZXJmYWNlICpjbGFzc19pbnRmOworCXVuc2lnbmVkIGludCBub2lv X2ZsYWc7CiAKIAkvKgogCSAqIEhvbGQgdGhlIGRldmljZSBsb2NrIGFuZCBzZXQgdGhlICJkZWFk IiBmbGFnIHRvIGd1YXJhbnRlZSB0aGF0CkBAIC0yMjU2LDYgKzIyNTcsNyBAQCB2b2lkIGRldmlj ZV9kZWwoc3RydWN0IGRldmljZSAqZGV2KQogCQlkZXZpY2VfcmVtb3ZlX3N5c19kZXZfZW50cnko ZGV2KTsKIAkJZGV2aWNlX3JlbW92ZV9maWxlKGRldiwgJmRldl9hdHRyX2Rldik7CiAJfQorCW5v aW9fZmxhZyA9IG1lbWFsbG9jX25vaW9fc2F2ZSgpOwogCWlmIChkZXYtPmNsYXNzKSB7CiAJCWRl dmljZV9yZW1vdmVfY2xhc3Nfc3ltbGlua3MoZGV2KTsKIApAQCAtMjI3Nyw2ICsyMjc5LDggQEAg dm9pZCBkZXZpY2VfZGVsKHN0cnVjdCBkZXZpY2UgKmRldikKIAlkZXZpY2VfcGxhdGZvcm1fbm90 aWZ5KGRldiwgS09CSl9SRU1PVkUpOwogCWRldmljZV9yZW1vdmVfcHJvcGVydGllcyhkZXYpOwog CWRldmljZV9saW5rc19wdXJnZShkZXYpOworCW1lbWFsbG9jX25vaW9fcmVzdG9yZShub2lvX2Zs YWcpOworCiAKIAlpZiAoZGV2LT5idXMpCiAJCWJsb2NraW5nX25vdGlmaWVyX2NhbGxfY2hhaW4o JmRldi0+YnVzLT5wLT5idXNfbm90aWZpZXIsCi0tIAoyLjE2LjQKCg== --=-I2kQBv2Gth4pqYzgYdi+--