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Date: Sat, 09 Sep 2017 22:47:14 +0100
From: Ben Hutchings <ben@...adent.org.uk>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC: akpm@...ux-foundation.org,
"Tatyana Brokhman" <tlinder@...eaurora.org>,
"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
"Alan Stern" <stern@...land.harvard.edu>,
"Johan Hovold" <johan@...nel.org>
Subject: [PATCH 3.16 043/233] USB: gadget: dummy_hcd: fix hub-descriptor
removable fields
3.16.48-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Johan Hovold <johan@...nel.org>
commit d81182ce30dbd497a1e7047d7fda2af040347790 upstream.
Flag the first and only port as removable while also leaving the
remaining bits (including the reserved bit zero) unset in accordance
with the specifications:
"Within a byte, if no port exists for a given location, the bit
field representing the port characteristics shall be 0."
Also add a comment marking the legacy PortPwrCtrlMask field.
Fixes: 1cd8fd2887e1 ("usb: gadget: dummy_hcd: add SuperSpeed support")
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: Tatyana Brokhman <tlinder@...eaurora.org>
Signed-off-by: Johan Hovold <johan@...nel.org>
Acked-by: Alan Stern <stern@...land.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
[bwh: Backported to 3.16: adjust filename]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
drivers/usb/gadget/dummy_hcd.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- a/drivers/usb/gadget/dummy_hcd.c
+++ b/drivers/usb/gadget/dummy_hcd.c
@@ -1933,7 +1933,7 @@ ss_hub_descriptor(struct usb_hub_descrip
desc->wHubCharacteristics = cpu_to_le16(0x0001);
desc->bNbrPorts = 1;
desc->u.ss.bHubHdrDecLat = 0x04; /* Worst case: 0.4 micro sec*/
- desc->u.ss.DeviceRemovable = 0xffff;
+ desc->u.ss.DeviceRemovable = 0;
}
static inline void hub_descriptor(struct usb_hub_descriptor *desc)
@@ -1943,8 +1943,8 @@ static inline void hub_descriptor(struct
desc->bDescLength = 9;
desc->wHubCharacteristics = cpu_to_le16(0x0001);
desc->bNbrPorts = 1;
- desc->u.hs.DeviceRemovable[0] = 0xff;
- desc->u.hs.DeviceRemovable[1] = 0xff;
+ desc->u.hs.DeviceRemovable[0] = 0;
+ desc->u.hs.DeviceRemovable[1] = 0xff; /* PortPwrCtrlMask */
}
static int dummy_hub_control(
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