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| author | Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> | 2024-06-03 08:58:41 +0200 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2024-06-03 14:10:23 +0200 |
| commit | a5b7365f28c191df6b93f60942d2b9a9fe71746c (patch) | |
| tree | f98ba5554c126c0dca9daf37ccc13aaf2b4de57f /drivers/soundwire | |
| parent | soundwire: debugfs: add interface to read/write commands (diff) | |
| download | linux-a5b7365f28c191df6b93f60942d2b9a9fe71746c.tar.xz linux-a5b7365f28c191df6b93f60942d2b9a9fe71746c.zip | |
soundwire: bus: add stream refcount
The notion of stream is by construction based on a multi-bus
capability, to allow for aggregation of Peripheral devices or
functions located on different segments. We currently count how many
master_rt contexts are used by a stream, but we don't have the dual
refcount of how many streams are allocated on a given bus. This
refcount will be useful to check if BTP/BRA streams can be allocated.
Note that the stream_refcount is modified in sdw_master_rt_alloc() and
sdw_master_rt_free() which are both called with the bus_lock mutex
held, so there's no need for refcount_ primitives for additional
protection.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20240603065841.4860-2-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/soundwire')
| -rw-r--r-- | drivers/soundwire/stream.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/soundwire/stream.c b/drivers/soundwire/stream.c index 4e9e7d2a942d..7aa4900dcf31 100644 --- a/drivers/soundwire/stream.c +++ b/drivers/soundwire/stream.c @@ -1181,6 +1181,8 @@ static struct sdw_master_runtime m_rt->bus = bus; m_rt->stream = stream; + bus->stream_refcount++; + return m_rt; } @@ -1217,6 +1219,7 @@ static void sdw_master_rt_free(struct sdw_master_runtime *m_rt, struct sdw_stream_runtime *stream) { struct sdw_slave_runtime *s_rt, *_s_rt; + struct sdw_bus *bus = m_rt->bus; list_for_each_entry_safe(s_rt, _s_rt, &m_rt->slave_rt_list, m_rt_node) { sdw_slave_port_free(s_rt->slave, stream); @@ -1226,6 +1229,8 @@ static void sdw_master_rt_free(struct sdw_master_runtime *m_rt, list_del(&m_rt->stream_node); list_del(&m_rt->bus_node); kfree(m_rt); + + bus->stream_refcount--; } /** |