dmaengine: zynqmp_dma: fix lockdep warning in tasklet

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The tasklet that handles the completed dma transfers uses spin_unlock
for unlocking a spin lock that was previously locked with
spin_lock_irqsave.

This caused the following lockdep warning about an inconsistent lock
state:

	inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage.

We must use spin_lock_irqsave, because it is possible to queue DMA
transfers from an irq handler.

Replace the spin_unlock and spin_lock by spin_unlock_irqrestore and
spin_lock_irqsave.

Signed-off-by: Michael Tretter <m.tretter@pengutronix.de>
Link: https://lore.kernel.org/r/20210826094742.1302009-8-m.tretter@pengutronix.de
Signed-off-by: Vinod Koul <vkoul@kernel.org>

...

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Michael Tretter 2021-08-26 11:47:42 +02:00 • committed by Vinod Koul

parent 193a750df5

commit 9558cf4ad0

1 changed files with 2 additions and 2 deletions

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drivers/dma/xilinx/zynqmp_dma.c

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