• Julia Cartwright's avatar
    i2c: mux: pca954x: make use of raw_spinlock variants · 743cc375
    Julia Cartwright authored
    The pca954x i2c mux driver currently implements an irq_chip for handling
    interrupts; due to how irq_chip handling is done, it's necessary for the
    irq_chip methods to be invoked from hardirq context, even on a a
    real-time kernel.  Because the spinlock_t type becomes a "sleeping"
    spinlock w/ RT kernels, it is not suitable to be used with irq_chips.
    
    A quick audit of the operations under the lock reveal that they do only
    minimal, bounded work, and are therefore safe to do under a raw spinlock.
    Signed-off-by: default avatarJulia Cartwright <julia@ni.com>
    Signed-off-by: default avatarPeter Rosin <peda@axentia.se>
    743cc375
i2c-mux-pca954x.c 12.3 KB