kernel/include/sound/pcm_oss.h, branch linux-5.1.y

ALSA: pcm: Return -EBUSY for OSS ioctls changing busy streams

2018-03-23T21:18:05Z

OSS PCM stream management isn't modal but it allows ioctls issued at any time for changing the parameters. In the previous hardening patch ("ALSA: pcm: Avoid potential races between OSS ioctls and read/write"), we covered these races and prevent the corruption by protecting the concurrent accesses via params_lock mutex. However, this means that some ioctls that try to change the stream parameter (e.g. channels or format) would be blocked until the read/write finishes, and it may take really long. Basically changing the parameter while reading/writing is an invalid operation, hence it's even more user-friendly from the API POV if it returns -EBUSY in such a situation. This patch adds such checks in the relevant ioctls with the addition of read/write access refcount. Cc: Signed-off-by: Takashi Iwai

ALSA: pcm_lib - cleanup & merge hw_ptr update functions

2010-01-07T14:47:38Z

Do general cleanup in snd_pcm_update_hw_ptr*() routines and merge them. The main change is hw_ptr_interrupt variable removal to simplify code logic. This variable can be computed directly from hw_ptr. Ensure that updated hw_ptr is not lower than previous one (it was possible with old code in some obscure situations when interrupt was delayed or the lowlevel driver returns wrong ring buffer position value). Signed-off-by: Jaroslav Kysela

[ALSA] Changed Jaroslav Kysela's e-mail from perex@suse.cz to perex@perex.cz

2007-10-16T14:51:18Z

Signed-off-by: Jaroslav Kysela

[ALSA] Fix races in PCM OSS emulation

2006-12-20T07:55:54Z

Fixed the race among multiple threads accessing the OSS PCM instance concurrently by simply introducing a mutex for protecting a setup of the PCM. Signed-off-by: Takashi Iwai Signed-off-by: Jaroslav Kysela

[ALSA] Fix Oops at rmmod with CONFIG_SND_VERBOSE_PROCFS=n

2006-04-27T19:10:42Z

Fixed Oops at rmmod with CONFIG_SND_VERBOSE_PROCFS=n. Add ifdef to struct fields for optimization and better compile checks. Signed-off-by: Takashi Iwai

[ALSA] Fix / clean up PCM-OSS setup hooks

2006-03-31T15:58:59Z

- Fix possible race of referring the setup hook from the running PCM - Fix memory leak in an error path of proc write - Clean up the setup hook parser Signed-off-by: Takashi Iwai

[ALSA] Clean up PCM codes (take 2)

2006-03-31T15:58:59Z

- Clean up initialization and destruction of substream instance Now snd_pcm_open_substream() alone does most initialization jobs. Add pcm_release callback for cleaning up at snd_pcm_release_substream() - Tidy up PCM oss code Signed-off-by: Takashi Iwai

[ALSA] semaphore -> mutex (core part)

2006-03-22T09:24:50Z

Semaphore to mutex conversion. The conversion was generated via scripts, and the result was validated automatically via a script as well. Signed-off-by: Ingo Molnar Signed-off-by: Andrew Morton Signed-off-by: Takashi Iwai

[ALSA] PCM midlevel & PCM OSS - make procfs & OSS plugin code optional

2006-03-22T09:23:12Z

Modules: ALSA Core,PCM Midlevel,ALSA<-OSS emulation,USB generic driver 1) The verbose procfs code for the PCM midlevel and usb audio can be removed now (more patches will follow). CONFIG_SND_VERBOSE_PROCFS 2) The PCM OSS plugin system can be also compiled optionaly. CONFIG_SND_PCM_OSS_PLUGINS Signed-off-by: Jaroslav Kysela

[ALSA] Remove xxx_t typedefs: PCM OSS-emulation

2006-01-03T11:17:48Z

Modules: ALSA<-OSS emulation Remove xxx_t typedefs from the core PCM OSS-emulation codes. Signed-off-by: Takashi Iwai