alsa-project/alsa-utils pull request #31 was opened from takaswie:

Axfer internally has the waiter abstraction for polling system call. This is used without explicit timeout for IRQ-based scheduling model. As a result, axfer process is corrupted to be blocked due to a call of polling system call when transmission backend has a bug to queue PCM event in I/O thread or hardware IRQ context.

This patchset implements error reporting for such buggy backend. When call of polling system call returns with timeout, axfer reports it as a bug. The timeout is equivalent to the size of buffer. Precisely it should be the size of period, however the larger size is used to stabilize runtime for existent PCM plugins.

``` Takashi Sakamoto (6): axfer: return the number of file descriptors for I/O events from select(2) waiter axfer: fix to return error code when a call of select(2) fails axfer: return ETIMEDOUT when no event occurs after waiter expiration axfer: handle -ETIMEDOUT before handle mmap I/O operation axfer: code refactoring for a helper function to wait for avail buffer space axfer: handle -ETIMEDOUT before non-block I/O operation

axfer/waiter-select.c | 4 +-- axfer/xfer-libasound-irq-mmap.c | 19 +++++++++- axfer/xfer-libasound-irq-rw.c | 62 +++++++++++++++++++-------------- axfer/xfer-libasound.c | 21 +++++++---- 4 files changed, 70 insertions(+), 36 deletions(-) ```

Request URL : https://github.com/alsa-project/alsa-utils/pull/31 Patch URL : https://github.com/alsa-project/alsa-utils/pull/31.patch Repository URL: https://github.com/alsa-project/alsa-utils