diff options
| author | Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> | 2021-03-08 10:55:38 +0900 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-03-10 09:36:13 +0100 |
| commit | b1d25e6ee57c2605845595b6c61340d734253eb3 (patch) | |
| tree | d2f1d11b2642ac929fc4d3eb3ed707325fbcfc4e /drivers/usb | |
| parent | 2664deb0930643149d61cddbb66ada527ae180bd (diff) | |
usb: renesas_usbhs: Clear PIPECFG for re-enabling pipe with other EPNUM
According to the datasheet, this controller has a restriction
which "set an endpoint number so that combinations of the DIR bit and
the EPNUM bits do not overlap.". However, since the udc core driver is
possible to assign a bulk pipe as an interrupt endpoint, an endpoint
number may not match the pipe number. After that, when user rebinds
another gadget driver, this driver broke the restriction because
the driver didn't clear any configuration in usb_ep_disable().
Example:
# modprobe g_ncm
Then, EP3 = pipe 3, EP4 = pipe 4, EP5 = pipe 6
# rmmod g_ncm
# modprobe g_hid
Then, EP3 = pipe 6, EP4 = pipe 7.
So, pipe 3 and pipe 6 are set as EP3.
So, clear PIPECFG register in usbhs_pipe_free().
Fixes: dfb87b8bfe09 ("usb: renesas_usbhs: gadget: fix re-enabling pipe without re-connecting")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Link: https://lore.kernel.org/r/1615168538-26101-1-git-send-email-yoshihiro.shimoda.uh@renesas.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/renesas_usbhs/pipe.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/usb/renesas_usbhs/pipe.c b/drivers/usb/renesas_usbhs/pipe.c index e7334b7fb3a6..75fff2e4cbc6 100644 --- a/drivers/usb/renesas_usbhs/pipe.c +++ b/drivers/usb/renesas_usbhs/pipe.c @@ -746,6 +746,8 @@ struct usbhs_pipe *usbhs_pipe_malloc(struct usbhs_priv *priv, void usbhs_pipe_free(struct usbhs_pipe *pipe) { + usbhsp_pipe_select(pipe); + usbhsp_pipe_cfg_set(pipe, 0xFFFF, 0); usbhsp_put_pipe(pipe); } |