CVS commit: src/sys/dev

["Juergen Hannken-Illjes" <hannken%netbsd.org@localhost>]

Module Name:    src
Committed By:   hannken
Date:           Sun Mar 31 14:56:41 UTC 2024

Modified Files:
        src/sys/dev: ccd.c

Log Message:
Using a ccd(4) with GPT (dk* at ccd*) the disk framework will call
ccdstrategy() -> ccdstart() -> ccdbuffer()  from softint context.
Allocating the buffer with PR_WAITOK here is forbidden.

Change ccdstart() / ccdbuffer() to report failure back to caller and
pass PR_WAITOK / PR_NOWAIT as an additional argument.

Call ccdstart() with PR_NOPWAIT from ccdstrategy() and on error defer
to the kthread.  Call ccdstart() with PR_WAITOK from kthread so requests
from kthread always succeed to allocate the buffers.

Remove the (non working) throttling on low memory as it is no longer needed.

Fixes PR kern/58043 "kernel crash in assert_sleepable() in -current,
dk(4) driver?"


To generate a diff of this commit:
cvs rdiff -u -r1.189 -r1.190 src/sys/dev/ccd.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.