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USB: Accept bulk endpoints with 1024-byte maxpacket 

Some non-compliant high-speed USB devices have bulk endpoints with a
1024-byte maxpacket size.  Although such endpoints don't work with
xHCI host controllers, they do work with EHCI controllers.  We used to
accept these invalid sizes (with a warning), but we no longer do
because of an unintentional change introduced by commit aed9d65ac3
("USB: validate wMaxPacketValue entries in endpoint descriptors").

This patch restores the old behavior, so that people with these
peculiar devices can use them without patching their kernels by hand.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Suggested-by: Elvinas <elvinas@veikia.lt>
Fixes: aed9d65ac3 ("USB: validate wMaxPacketValue entries in endpoint descriptors")
CC: <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alan Stern 2018-05-03 11:04:48 -04:00 committed by Greg Kroah-Hartman
parent 44a182b9d1
commit fb5ee84ea7
1 changed files with 3 additions and 1 deletions
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4
drivers/usb/core/config.c
View File

@ -191,7 +191,9 @@ static const unsigned short full_speed_maxpacket_maxes[4] = {
static const unsigned short high_speed_maxpacket_maxes[4] = {
[USB_ENDPOINT_XFER_CONTROL] = 64,
[USB_ENDPOINT_XFER_ISOC] = 1024,
[USB_ENDPOINT_XFER_BULK] = 512,
/* Bulk should be 512, but some devices use 1024: we will warn below */
[USB_ENDPOINT_XFER_BULK] = 1024,
[USB_ENDPOINT_XFER_INT] = 1024,
};
static const unsigned short super_speed_maxpacket_maxes[4] = {