diff options
author | Takashi Iwai <tiwai@suse.de> | 2019-11-05 11:01:37 +0300 |
---|---|---|
committer | Takashi Iwai <tiwai@suse.de> | 2019-11-06 17:43:33 +0300 |
commit | 7e8edae39fd1f880f098612c991cf6d0f646c20d (patch) | |
tree | fce448380f7e5f00ee63a87614612e6bbc8b9899 /Documentation/sound | |
parent | 1fe7f397cfe229494a88c6496b53ba532d4d4a42 (diff) | |
download | linux-7e8edae39fd1f880f098612c991cf6d0f646c20d.tar.xz |
ALSA: pcm: Handle special page mapping in the default mmap handler
When a driver needs to deal with a special buffer like a SG or a
vmalloc buffer, it has to set up the PCM page ops explicitly for the
corresponding helper function. This is rather error-prone and many
people forgot or incorrectly used it.
For simplifying the call patterns and avoiding such a potential bug,
this patch enhances the PCM default mmap handler to check the
(pre-)allocated buffer type and handles the page gracefully depending
on the buffer type. If the PCM page ops is given, the ops is still
used in a higher priority. The new code path is only for the default
(NULL page ops) case.
Link: https://lore.kernel.org/r/20191105080138.1260-4-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'Documentation/sound')
0 files changed, 0 insertions, 0 deletions