This patchset refine some spinlocks which I think not used properly. Maybe my
'refine' make the code broken, so any comments will be appreciated.
patch1: The function 'usbip_event_add()' may be called in interrupt context on
the stub side:
'stub_complete'->'stub_enqueue_ret_unlink'->'usbip_event_add'.
In this function it tries to get the lock 'ud->lock', so we shoud disable irq
when we get this lock in process context.
patch2: On the client side, we have a virtual hcd driver so there actually no
hardware interrupts. Maybe to achieve a good performance there is no need to
use the interrupt safe spinlock. Just replace them with a non interrupt safe
version.
Harvey Yang (2):
staging: usbip: use interrupt safe spinlock to avoid potential
deadlock.
staging: usbip: replace the interrupt safe spinlock because no
hardware interrupt exists.
drivers/staging/usbip/stub_dev.c | 34 ++++++++--------
drivers/staging/usbip/stub_rx.c | 4 +-
drivers/staging/usbip/usbip_event.c | 6 ++-
drivers/staging/usbip/vhci_hcd.c | 75 +++++++++++++++--------------------
drivers/staging/usbip/vhci_rx.c | 10 ++---
drivers/staging/usbip/vhci_tx.c | 14 +++----
6 files changed, 65 insertions(+), 78 deletions(-)
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