| Subject | Re: [PATCH 12/19] i2c: mux: pca954x: make use of raw_spinlock variants | From | Peter Rosin <> | Date | Thu, 16 Mar 2017 20:38:06 +0100 |
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On 2017-03-09 17:21, Julia Cartwright wrote: > 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: Julia Cartwright <julia@ni.com>
Patch applied to the i2c-mux repo. Thanks!
Cheers, peda
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