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* Kernel 5.13.6 breaks mmap with snd-hdsp module
@ 2021-08-07  7:49 Jeff Woods
  2021-08-07  8:16 ` Greg KH
  0 siblings, 1 reply; 8+ messages in thread
From: Jeff Woods @ 2021-08-07  7:49 UTC (permalink / raw)
  To: stable; +Cc: regressions

Specifically, commit c4824ae7db418aee6f50f308a20b832e58e997fd triggers the problem. Reverting this change restores functionality.

The device is an RME Multiface II, using the snd-hdsp driver.

Expected behavior: Device plays sound normally

Exhibited behavior: When a program attempts to open the device, the following ALSA lib error happens:

ALSA lib pcm_direct.c:1169:(snd1_pcm_direct_initialize_slave) slave plugin does not support mmap interleaved or mmap noninterleaved access

This change hasn't affected my other computers with less esoteric hardware, so probably the problem lies with the snd-hdsp driver, but the device is unusable without reverting that commit.

I am available to test any patches for this issue.

J Woods

^ permalink raw reply	[flat|nested] 8+ messages in thread

end of thread, other threads:[~2021-08-09  6:55 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-08-07  7:49 Kernel 5.13.6 breaks mmap with snd-hdsp module Jeff Woods
2021-08-07  8:16 ` Greg KH
2021-08-07  9:26   ` Takashi Iwai
2021-08-07 22:51     ` Jeff Woods
2021-08-08  7:01       ` Takashi Iwai
2021-08-08 19:09         ` Jeff Woods
2021-08-09  6:50           ` Greg KH
2021-08-09  6:55           ` Takashi Iwai

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