Re: Bug in in spi-bcm53xx (rcu_sched) exposed by 0461a41 ("spi: Pump transfers inside calling context for spi_sync()")
From: Mark Brown <hidden>
Date: 2016-02-10 12:48:28
On Wed, Feb 10, 2016 at 01:21:04PM +0100, Rafał Miłecki wrote:
Unfortunately the bug in spi-bcm53xx isn't obvious for me. I kept looking at its code for a bit but couldn't find anything.
Knowing the commit that exposed this bug, does it give you any hint what may be wrong with spi-bcm53xx?
It's most likely just hammering the CPU for a very long time without scheduling due to doing a long PIO transfers. That change just removes some needless context switching.
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