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rt_data_queue_pop() holds the data queue spinlock while updating the ring
state, then calls rt_data_queue_len(). The length function tries to acquire
the same non-recursive spinlock again, causing an SMP deadlock when a pop
leaves the queue non-empty.
Add a private _data_queue_len_nolock() helper for callers which already hold
the queue lock. Keep the public rt_data_queue_len() protected by one spinlock
acquisition.
This does not change the public API, ABI, queue state transitions, low-water
mark wakeups, or event callback behavior.
Tested on a four-core Spacemit K1 with cyclic HDMI playback and by building the
SMP QEMU Virt64 RISC-V BSP with generic audio, Intel HDA and VirtIO Sound.
Signed-off-by: GuEe-GUI <[email protected]>
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int/rt_int32_t
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无法恢复运行的错误 (#8839)
队列在 push 后查找挂起列表时使用了错误的挂起列表。
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Signed-off-by: Shell <[email protected]>
Co-authored-by: xqyjlj <[email protected]>
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Signed-off-by: Shell <[email protected]>
Co-authored-by: Shell <[email protected]>
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* Synchronize the code of the rt mart branch to the master branch.
* TTY device
* Add lwP code from rt-smart
* Add vnode in DFS, but DFS will be re-write for rt-smart
* There are three libcpu for rt-smart:
* arm/cortex-a, arm/aarch64
* riscv64
Co-authored-by: Rbb666 <[email protected]>
Co-authored-by: zhkag <[email protected]>
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