usb: renesas_usbhs: fix to avoid using a disabled ep in usbhsg_queue_done()

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commit 4fccb0767f 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>

...

This commit is contained in:

Yoshihiro Shimoda 2016-04-04 20:40:20 +09:00 • committed by Greg Kroah-Hartman

parent 46e081b301

commit 277882f94e

1 changed files with 5 additions and 1 deletions

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drivers/usb/renesas_usbhs/mod_gadget.c

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