This patchset refines some spinlocks which maybe not used properly.
[PATCH 1/2]: 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 should disable irq when we get this lock in process context.
[PATCH 2/2]: On the client side, we have a virtual hcd driver, there actually no hardware interrupts, so we do not need worry about race conditions caused by irq. 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 spinlocks with common
ones.
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 | 76 +++++++++++++++--------------------
drivers/staging/usbip/vhci_rx.c | 10 ++---
drivers/staging/usbip/vhci_tx.c | 14 +++----
6 files changed, 65 insertions(+), 79 deletions(-)
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