openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

usb: gadget: f_fs: preserve wMaxPacketSize across usb_ep_autoconfig() call 

usb_ep_autoconfig() treats the passed descriptor as if it were an fs
descriptor. In particular, for bulk endpoints, it clips wMaxPacketSize
to 64. This patch preserves the original value.

Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Andrzej Pietrasiewicz 2019-01-31 15:53:40 +01:00 committed by Felipe Balbi
parent dffe2d7fc4
commit bdcc03cef0
1 changed files with 11 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/usb/gadget/function/f_fs.c
View File

@ -2843,12 +2843,18 @@ static int __ffs_func_bind_do_descs(enum ffs_entity_type type, u8 *valuep,
struct usb_request *req;
struct usb_ep *ep;
u8 bEndpointAddress;
u16 wMaxPacketSize;
/*
* We back up bEndpointAddress because autoconfig overwrites
* it with physical endpoint address.
*/
bEndpointAddress = ds->bEndpointAddress;
/*
* We back up wMaxPacketSize because autoconfig treats
* endpoint descriptors as if they were full speed.
*/
wMaxPacketSize = ds->wMaxPacketSize;
pr_vdebug("autoconfig\n");
ep = usb_ep_autoconfig(func->gadget, ds);
if (unlikely(!ep))
@ -2869,6 +2875,11 @@ static int __ffs_func_bind_do_descs(enum ffs_entity_type type, u8 *valuep,
*/
if (func->ffs->user_flags & FUNCTIONFS_VIRTUAL_ADDR)
ds->bEndpointAddress = bEndpointAddress;
/*
* Restore wMaxPacketSize which was potentially
* overwritten by autoconfig.
*/
ds->wMaxPacketSize = wMaxPacketSize;
}
ffs_dump_mem(": Rewritten ep desc", ds, ds->bLength);