spi: Ensure the io_mutex is held until spi_finalize_current_message()

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This patch introduces a completion that is completed in
spi_finalize_current_message() and waited for in
__spi_pump_transfer_message(). This way all manipulation of ctlr->cur_msg
is done with the io_mutex held and strictly ordered:
__spi_pump_transfer_message() will not return until
spi_finalize_current_message() is done using ctlr->cur_msg, and its
calling context is only touching ctlr->cur_msg after returning.
Due to this, we can safely drop the spin-locks around ctlr->cur_msg.

Signed-off-by: David Jander <david@protonic.nl>
Link: https://lore.kernel.org/r/20220621061234.3626638-11-david@protonic.nl
Signed-off-by: Mark Brown <broonie@kernel.org>

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David Jander 2022-06-21 08:12:33 +02:00 • committed by Mark Brown

parent 72c5c59b65

commit 69fa95905d

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2 changed files with 16 additions and 22 deletions

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32

drivers/spi/spi.c

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6

include/linux/spi/spi.h

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