| Message ID | 1615168538-26101-1-git-send-email-yoshihiro.shimoda.uh@renesas.com |
|---|---|
| State | New |
| Headers | show |
| Series | usb: renesas_usbhs: Clear PIPECFG for re-enabling pipe with other EPNUM | expand |
diff --git a/drivers/usb/renesas_usbhs/pipe.c b/drivers/usb/renesas_usbhs/pipe.c index e7334b7..75fff2e 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); }
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") Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> --- drivers/usb/renesas_usbhs/pipe.c | 2 ++ 1 file changed, 2 insertions(+)