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| author | David Jander <david@protonic.nl> | 2022-06-21 09:12:33 +0300 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2022-06-27 15:27:25 +0300 |
| commit | 69fa95905d40846756d22402690ddf5361a9d13b (patch) | |
| tree | 08eb639a0785fd1564e05e2664532164917d2f28 /include/linux/spi | |
| parent | 72c5c59b659d54d0c824d0333a211f373316361d (diff) | |
| download | linux-69fa95905d40846756d22402690ddf5361a9d13b.tar.xz | |
spi: Ensure the io_mutex is held until spi_finalize_current_message()
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>
Diffstat (limited to 'include/linux/spi')
| -rw-r--r-- | include/linux/spi/spi.h | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h index c58f46be762f..c56e0d240a58 100644 --- a/include/linux/spi/spi.h +++ b/include/linux/spi/spi.h @@ -384,6 +384,7 @@ extern struct spi_device *spi_new_ancillary_device(struct spi_device *spi, u8 ch * @queue_lock: spinlock to syncronise access to message queue * @queue: message queue * @cur_msg: the currently in-flight message + * @cur_msg_completion: a completion for the current in-flight message * @cur_msg_mapped: message has been mapped for DMA * @last_cs: the last chip_select that is recorded by set_cs, -1 on non chip * selected @@ -615,6 +616,7 @@ struct spi_controller { spinlock_t queue_lock; struct list_head queue; struct spi_message *cur_msg; + struct completion cur_msg_completion; bool busy; bool running; bool rt; @@ -989,7 +991,6 @@ struct spi_transfer { * @state: for use by whichever driver currently owns the message * @resources: for resource management when the spi message is processed * @prepared: spi_prepare_message was called for the this message - * @sync: this message took the direct sync path skipping the async queue * * A @spi_message is used to execute an atomic sequence of data transfers, * each represented by a struct spi_transfer. The sequence is "atomic" @@ -1042,9 +1043,6 @@ struct spi_message { /* spi_prepare_message was called for this message */ bool prepared; - - /* this message is skipping the async queue */ - bool sync; }; static inline void spi_message_init_no_memset(struct spi_message *m) |