From mboxrd@z Thu Jan 1 00:00:00 1970 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Subject: [RFC] cdc-acm: do not drop data from fast devices From: Oliver Neukum Message-Id: <1520265871.6256.15.camel@suse.com> Date: Mon, 05 Mar 2018 17:04:31 +0100 To: Romain Izard , johan@kernel.org Cc: Greg Kroah-Hartman , linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, linux-usb@vger.kernel.org List-ID: T24gTW9uLCAyMDE4LTAzLTA1IGF0IDEwOjU1ICswMTAwLCBSb21haW4gSXphcmQgd3JvdGU6Cgo+ IFRoZSBUVFkgYnVmZmVyIGlzIDQwOTYgYnl0ZXMgbGFyZ2UsIHRocm90dGxpbmcgd2hlbiB0aGVy ZSBhcmUgb25seSAxMjgKPiBmcmVlIGJ5dGVzIGxlZnQsIGFuZCB1bnRocm90dGxpbmcgd2hlbiB0 aGVyZSBhcmUgb25seSAxMjggYnl0ZXMgYXZhaWxhYmxlLgo+IEJ1dCB0aGUgVFRZIGJ1ZmZlciBp cyBmaWxsZWQgZnJvbSBhbiBpbnRlcm1lZGlhdGUgZmxpcCBidWZmZXIgdGhhdAo+IGNvbnRhaW5z IHVwIHRvIDY0IEtpQiBvZiBkYXRhLCBhbmQgZWFjaCB0aW1lIHVudGhyb3R0bGUoKSBpcyBjYWxs ZWQgMTYKPiBVUkJzIGFyZSBzY2hlZHVsZWQgYnkgdGhlIGRyaXZlciwgc2VuZGluZyB1cCB0byAx NiBLaUIgdG8gdGhlIGZsaXAgYnVmZmVyLgo+IEFzIHRoZSByZXN1bHQgb2YgdHR5X2luc2VydF9m bGlwX3N0cmluZygpIGlzIG5vdCBjaGVja2VkIGluIHRoZSBVUkIKPiByZWNlcHRpb24gY2FsbGJh Y2ssIGRhdGEgY2FuIGJlIGxvc3Qgd2hlbiB0aGUgZmxpcCBidWZmZXIgaXMgZmlsbGVkIGZhc3Rl cgo+IHRoYW4gdGhlIFRUWSBpcyBlbXB0aWVkLgoKSXQgc2VlbXMgdG8gbWUgdGhhdCB0aGUgcHJv YmxlbSBpcyBpbiB0aGUgY29uY2VwdCBoZXJlLiBJZiB5b3UgY2Fubm90CnRha2UgYWxsIGRhdGEs IHlvdSBzaG91bGQgdGVsbCB0aGUgbG93ZXIgbGF5ZXIgaG93IG11Y2ggZGF0YSB5b3UgY2FuCnRh a2UuCgo+IE1vcmVvdmVyLCBhcyB0aGUgVVJCIGNhbGxiYWNrcyBhcmUgY2FsbGVkIGZyb20gYSB0 YXNrbGV0IGNvbnRleHQsIHdoZXJlYXMKPiB0aHJvdHRsaW5nIGlzIGNhbGxlZCBmcm9tIHRoZSBz eXN0ZW0gd29ya3F1ZXVlLCBpdCBpcyBwb3NzaWJsZSBmb3IgdGhlCj4gdGhyb3R0bGluZyB0byBi ZSBkZWxheWVkIGJ5IGhpZ2ggdHJhZmZpYyBpbiB0aGUgdGFza2xldC4gQXMgYSByZXN1bHQsCj4g Y29tcGxldGVkIFVSQnMgY2FuIGJlIHJlc3VibWl0dGVkIGV2ZW4gaWYgdGhlIGZsaXAgYnVmZmVy IGlzIGZ1bGwsIGFuZCB3ZQo+IHJlcXVlc3QgbW9yZSBkYXRhIGZyb20gdGhlIGRldmljZSBvbmx5 IHRvIGRyb3AgaXQgaW1tZWRpYXRlbHkuCgpUaGF0IHBvaW50cyB0byBhIGRlZmljaWVuY3kgd2l0 aCBob3cgd2UgdGhyb3R0bGUuIE1heWJlIHdlIHNob3VsZCBwb2lzb24KVVJCcyB1cG9uIHRocm90 dGxlKCkgYmVpbmcgY2FsbGVkPwoKPiBUbyBwcmV2ZW50IHRoaXMgcHJvYmxlbSwgdGhlIFVSQnMg d2hvc2UgZGF0YSBkaWQgbm90IHJlYWNoIHRoZSBmbGlwIGJ1ZmZlcgo+IGFyZSBwbGFjZWQgaW4g YSB3YWl0aW5nIGxpc3QsIHdoaWNoIGlzIG9ubHkgcHJvY2Vzc2VkIHdoZW4gdGhlIHNlcmlhbCBw b3J0Cj4gaXMgdW50aHJvdHRsZWQuCgpTbyB3ZSBpbnRyb2R1Y2UgeWV0IGFub3RoZXIgYnVmZmVy PyBUaGF0IGRvZXMgbG9vayBsaWtlIHdlIGFyZSBwYXBlcmluZwpvdmVyIGEgZGVzaWduIHByb2Js ZW0uCgoKPiBUaGlzIGlzIHdvcmtpbmcgd2hlbiB1c2luZyB0aGUgbm9ybWFsIGxpbmUgZGlzY2lw bGluZSBvbiB0dHlBQ00uIEJ1dAo+IHRoZXJlIGlzIGEgYmlnIGhvbGUgaW4gdGhpczogb3RoZXIg bGluZSBkaXNjaXBsaW5lcyBkbyBub3QgdXNlIHRocm90dGxpbmcKPiBhbmQgdGh1cyB1bnRocm90 dGxlIGlzIG5ldmVyIGNhbGxlZC4gVGhlIFVSQnMgd2lsbCBuZXZlciBnZXQgcmVzdWJtaXR0ZWQs CgpOb3cgdGhhdCBpcyBhIHJlYWwgcHJvYmxlbS4gVGhpcyBpbnRyb2R1Y2VzIGEgcmVncmVzc2lv bi4KCj4gYW5kIHRoZSBwb3J0IGlzIGRlYWQuIFVuZm9ydHVuYXRlbHksIHRoZXJlIGlzIG5vIG5v dGlmaWNhdGlvbiB3aGVuIHRoZQo+IGZsaXAgYnVmZmVyIGlzIHJlYWR5IHRvIHJlY2VpdmUgbmV3 IGRhdGEsIHNvIHRoZSBvbmx5IGFsdGVybmF0aXZlIHdvdWxkCj4gYmUgdG8gc2NoZWR1bGUgYSB0 aW1lciBwb2xsaW5nIHRoZSBmbGlwIGJ1ZmZlci4gQnV0IHdpdGggYW4gYWRkaXRpb25hbAo+IGFz eW5jaHJvbm91cyBwcm9jZXNzIGluIHRoZSBtaXgsIHRoZSBjb2RlIHN0YXJ0cyB0byBiZSB2ZXJ5 IGJyaXR0bGUuCgpXZWxsLCBuby4gVGhpcyB0ZWxscyB1cyBzb21ldGhpbmcgaXMgYnJva2VuIGlu IHRoZSB0dHkgbGF5ZXIuCgo+IEkgYmVsaWV2ZSB0aGlzIGlzc3VlIGlzIG5vdCBsaW1pdGVkIHRv IHR0eUFDTS4gQXMgdGhlIFRUWSBsYXllciBpcyBub3QKPiBwZXJmb3JtYW5jZS1vcmllbnRlZCwg aXQgY2FuIGJlIGVhc3kgdG8gb3ZlcndoZWxtIGRldmljZXMgd2l0aCBhIGxvdwo+IGF2YWlsYWJs ZSBwcm9jZXNzaW5nIHBvd2VyLiBJbiBteSBjYXNlLCBhIG1vZGVtIHNlbmRpbmcgYSBzdXN0YWlu ZWQgMiBNQi9zCj4gb24gYSBkZWJ1ZyBwb3J0IChleHBvcnRlZCBhcyBhIENEQy1BQ00gcG9ydCkg d2FzIGVub3VnaCB0byB0cmlnZ2VyIHRoZQo+IGlzc3VlLiBUaGUgY29kZSBoYW5kbGluZyB0aGUg Q0RDLUFDTSBjbGFzcyBhbmQgdGhlIGdlbmVyaWMgVVNCIHNlcmlhbCBwb3J0Cj4gaXMgdmVyeSBz aW1pbGFyIHdoZW4gaXQgY29tZXMgdG8gVVJCIGhhbmRsaW5nLCBzbyBhbGwgZHJpdmVycyB0aGF0 IHJlbHkgb24KPiB0aGF0IGNvZGUgaGF2ZSB0aGUgc2FtZSBpc3N1ZS4KPiAKPiBCdXQgaW4gZ2Vu ZXJhbCwgaXQgc2VlbXMgdG8gbWUgdGhhdCB0aGVyZSBpcyBubyBjb2RlIGluIHRoZSBrZXJuZWwg dGhhdAo+IGNoZWNrcyB0aGUgcmV0dXJuIHZhbHVlIG9mIHR0eV9pbnNlcnRfZmxpcF9zdHJpbmco KS4gVGhpcyBtZWFucyB0aGF0IHdlCj4gYXJlIHdvcmtpbmcgd2l0aCB0aGUgYXNzdW1wdGlvbiB0 aGF0IHRoZSBrZXJuZWwgd2lsbCBjb25zdW1lIHRoZSBkYXRhCj4gZmFzdGVyIHRoYW4gdGhlIHNv dXJjZSBjYW4gc2VuZCBpdCwgb3IgdGhhdCB0aGUgdXBwZXIgbGF5ZXIgd2lsbCBiZQo+IGFibGUg b3Igd2lsbGluZyB0byB0aHJvdHRsZSBpdCBmYXN0IGVub3VnaCB0byBhdm9pZCBsb3NpbmcgZGF0 YS4KClllcy4gQW5kIGlmIHRoZSBhc3N1bXB0aW9uIGlzIGZhbHNlLCB5b3UgbmVlZCB0byBnbyBm b3IgdGhlIHR0eSBsYXllci4KSSBhbSBzb3JyeSwgYnV0IE5BQ0suCgoJUmVnYXJkcwoJCU9saXZl cgotLS0KVG8gdW5zdWJzY3JpYmUgZnJvbSB0aGlzIGxpc3Q6IHNlbmQgdGhlIGxpbmUgInVuc3Vi c2NyaWJlIGxpbnV4LXVzYiIgaW4KdGhlIGJvZHkgb2YgYSBtZXNzYWdlIHRvIG1ham9yZG9tb0B2 Z2VyLmtlcm5lbC5vcmcKTW9yZSBtYWpvcmRvbW8gaW5mbyBhdCAgaHR0cDovL3ZnZXIua2VybmVs Lm9yZy9tYWpvcmRvbW8taW5mby5odG1sCg==