tree 88a9e99282138bd21af563b98ab65ccc8ab088be
parent 077797117dfa209717e1f3f1416c1101c0e047f0
author Vitalii Demianets <vitas@nppfactor.kiev.ua> 1371735360 +0300
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1372116681 -0700

UIO: Fix concurrency issue

In a SMP case there was a race condition issue between
uio_pdrv_genirq_irqcontrol() running on one CPU and irq handler on
another CPU. Fix it by spin_locking shared resources access inside irq
handler.  Also:
  - Change disable_irq to disable_irq_nosync to avoid deadlock, because
    disable_irq waits for the completion of the irq handler;
  - Change atomic bit-manipulation routines to their non-atomic
    counterparts as we already are guarding the code by spinlock.

Signed-off-by: Vitalii Demianets <vitas@nppfactor.kiev.ua>
Reviewed-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>