PR/58043 CVS commit: src/sys/dev

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

The following reply was made to PR kern/58043; it has been noted by GNATS.

From: "Juergen Hannken-Illjes" <hannken%netbsd.org@localhost>
To: gnats-bugs%gnats.NetBSD.org@localhost
Cc: 
Subject: PR/58043 CVS commit: src/sys/dev
Date: Sun, 31 Mar 2024 14:56:41 +0000

 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.