From 90f20d722e132a7e2a2588c3d11734a375fe7bd7 Mon Sep 17 00:00:00 2001 From: Alan Stern Date: Wed, 8 May 2013 11:18:05 -0400 Subject: [PATCH] USB: xHCI: override bogus bulk wMaxPacketSize values MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit commit e4f47e3675e6f1f40906b785b934ce963e9f2eb3 upstream. This patch shortens the logic in xhci_endpoint_init() by moving common calculations involving max_packet and max_burst outside the switch statement, rather than repeating the same code in multiple case-specific statements. It also replaces two usages of max_packet which were clearly intended to be max_burst all along. More importantly, it compensates for a common bug in high-speed bulk endpoint descriptors. In many devices there is a bulk endpoint having a wMaxPacketSize value smaller than 512, which is forbidden by the USB spec. Some xHCI controllers can't handle this and refuse to accept the endpoint. This patch changes the max_packet value to 512, which allows the controller to use the endpoint properly. In practice the bogus maxpacket size doesn't matter, because none of the transfers sent via these endpoints are longer than the maxpacket value anyway. Signed-off-by: Alan Stern Reported-and-tested-by: "Aurélien Leblond" Signed-off-by: Greg Kroah-Hartman Signed-off-by: Ben Hutchings --- Reading git-format-patch failed