diff options
| author | Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> | 2016-04-04 20:40:20 +0900 |
|---|---|---|
| committer | Sasha Levin <sasha.levin@oracle.com> | 2016-04-20 09:40:49 -0400 |
| commit | 09cbe7dba48375f1638d04fe85224c15c178a197 (patch) | |
| tree | a3240aff349cb62bbac4b52cf05ea7f649a91a5c /drivers/usb | |
| parent | ccf7f20931bd04cd419d178d4f3a7c059690a924 (diff) | |
usb: renesas_usbhs: fix to avoid using a disabled ep in usbhsg_queue_done()
[ Upstream commit 4fccb0767fdbdb781a9c5b5c15ee7b219443c89d ]
This patch fixes an issue that usbhsg_queue_done() may cause kernel
panic when dma callback is running and usb_ep_disable() is called
by interrupt handler. (Especially, we can reproduce this issue using
g_audio with usb-dmac driver.)
For example of a flow:
usbhsf_dma_complete (on tasklet)
--> usbhsf_pkt_handler (on tasklet)
--> usbhsg_queue_done (on tasklet)
*** interrupt happened and usb_ep_disable() is called ***
--> usbhsg_queue_pop (on tasklet)
Then, oops happened.
Fixes: e73a989 ("usb: renesas_usbhs: add DMAEngine support")
Cc: <stable@vger.kernel.org> # v3.1+
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/renesas_usbhs/mod_gadget.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/usb/renesas_usbhs/mod_gadget.c b/drivers/usb/renesas_usbhs/mod_gadget.c index b9f8cb13b05b..e56bbb8ab9a0 100644 --- a/drivers/usb/renesas_usbhs/mod_gadget.c +++ b/drivers/usb/renesas_usbhs/mod_gadget.c @@ -153,10 +153,14 @@ static void usbhsg_queue_done(struct usbhs_priv *priv, struct usbhs_pkt *pkt) struct usbhs_pipe *pipe = pkt->pipe; struct usbhsg_uep *uep = usbhsg_pipe_to_uep(pipe); struct usbhsg_request *ureq = usbhsg_pkt_to_ureq(pkt); + unsigned long flags; ureq->req.actual = pkt->actual; - usbhsg_queue_pop(uep, ureq, 0); + usbhs_lock(priv, flags); + if (uep) + __usbhsg_queue_pop(uep, ureq, 0); + usbhs_unlock(priv, flags); } static void usbhsg_queue_push(struct usbhsg_uep *uep, |