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| author | Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> | 2016-04-04 20:40:20 +0900 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-04-20 15:42:11 +0900 |
| commit | 277882f94e1d2e82285eb3dc91944634174a9b18 (patch) | |
| tree | 62e7977afaab6f06cf1fd0f8f69ea3202b0da0a3 | |
| parent | 46e081b3015dd0d97e443babf0a7ec2058637d83 (diff) | |
| download | lwn-277882f94e1d2e82285eb3dc91944634174a9b18.tar.gz lwn-277882f94e1d2e82285eb3dc91944634174a9b18.zip | |
usb: renesas_usbhs: fix to avoid using a disabled ep in usbhsg_queue_done()
commit 4fccb0767fdbdb781a9c5b5c15ee7b219443c89d upstream.
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")
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -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 8f7a78e70975..fa14198daf77 100644 --- a/drivers/usb/renesas_usbhs/mod_gadget.c +++ b/drivers/usb/renesas_usbhs/mod_gadget.c @@ -158,10 +158,14 @@ 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, |