blob: 7622cc16eb474fc259f8bac312f547b1933545f1 [file] [log] [blame]
From bb1d34f87f1cecc03385a8e897ec485a2b83f017 Mon Sep 17 00:00:00 2001
From: Alan Stern <>
Date: Mon, 6 Jan 2020 10:43:42 -0500
Subject: [PATCH] USB: Fix: Don't skip endpoint descriptors with maxpacket=0
commit 2548288b4fb059b2da9ceada172ef763077e8a59 upstream.
It turns out that even though endpoints with a maxpacket length of 0
aren't useful for data transfer, the descriptors do serve other
purposes. In particular, skipping them will also skip over other
class-specific descriptors for classes such as UVC. This unexpected
side effect has caused some UVC cameras to stop working.
In addition, the USB spec requires that when isochronous endpoint
descriptors are present in an interface's altsetting 0 (which is true
on some devices), the maxpacket size _must_ be set to 0. Warning
about such things seems like a bad idea.
This patch updates an earlier commit which would log a warning and
skip these endpoint descriptors. Now we only log a warning, and we
don't even do that for isochronous endpoints in altsetting 0.
We don't need to worry about preventing endpoints with maxpacket = 0
from ever being used for data transfers; usb_submit_urb() already
checks for this.
Reported-and-tested-by: Roger Whittaker <>
Fixes: d482c7bb0541 ("USB: Skip endpoints with 0 maxpacket length")
Signed-off-by: Alan Stern <>
CC: Laurent Pinchart <>
Signed-off-by: Greg Kroah-Hartman <>
Signed-off-by: Paul Gortmaker <>
diff --git a/drivers/usb/core/config.c b/drivers/usb/core/config.c
index 7bcf89dfc617..c68217b7dace 100644
--- a/drivers/usb/core/config.c
+++ b/drivers/usb/core/config.c
@@ -403,12 +403,16 @@ static int usb_parse_endpoint(struct device *ddev, int cfgno,
endpoint->desc.wMaxPacketSize = cpu_to_le16(8);
- /* Validate the wMaxPacketSize field */
+ /*
+ * Validate the wMaxPacketSize field.
+ * Some devices have isochronous endpoints in altsetting 0;
+ * the USB-2 spec requires such endpoints to have wMaxPacketSize = 0
+ * (see the end of section 5.6.3), so don't warn about them.
+ */
maxp = usb_endpoint_maxp(&endpoint->desc);
- if (maxp == 0) {
- dev_warn(ddev, "config %d interface %d altsetting %d endpoint 0x%X has wMaxPacketSize 0, skipping\n",
+ if (maxp == 0 && !(usb_endpoint_xfer_isoc(d) && asnum == 0)) {
+ dev_warn(ddev, "config %d interface %d altsetting %d endpoint 0x%X has invalid wMaxPacketSize 0\n",
cfgno, inum, asnum, d->bEndpointAddress);
- goto skip_to_next_endpoint_or_interface_descriptor;
/* Find the highest legal maxpacket size for this endpoint */