PR/56403 CVS commit: [netbsd-9] src/sys/dev

["Martin Husemann" <martin%netbsd.org@localhost>]

The following reply was made to PR kern/56403; it has been noted by GNATS.

From: "Martin Husemann" <martin%netbsd.org@localhost>
To: gnats-bugs%gnats.NetBSD.org@localhost
Cc: 
Subject: PR/56403 CVS commit: [netbsd-9] src/sys/dev
Date: Fri, 30 Dec 2022 14:39:10 +0000

 Module Name:	src
 Committed By:	martin
 Date:		Fri Dec 30 14:39:10 UTC 2022
 
 Modified Files:
 	src/sys/dev/ata [netbsd-9]: ata.c ata_recovery.c ata_wdc.c atavar.h
 	    satapmp_subr.c wd.c
 	src/sys/dev/ic [netbsd-9]: ahcisata_core.c mvsata.c siisata.c wdc.c
 	    wdcvar.h
 	src/sys/dev/scsipi [netbsd-9]: atapi_wdc.c
 	src/sys/dev/usb [netbsd-9]: umass_isdata.c
 
 Log Message:
 Pull up following revision(s) (requested by tsutsui in ticket #1557):
 
 	sys/dev/ic/ahcisata_core.c: revision 1.83
 	sys/dev/ic/ahcisata_core.c: revision 1.102
 	sys/dev/ata/ata.c: revision 1.164
 	sys/dev/ata/ata_wdc.c: revision 1.115
 	sys/dev/ata/ata_recovery.c: revision 1.4
 	sys/dev/ic/siisata.c: revision 1.42
 	sys/dev/ic/wdc.c: revision 1.308
 	sys/dev/ic/mvsata.c: revision 1.56
 	sys/dev/scsipi/atapi_wdc.c: revision 1.138
 	sys/dev/ic/siisata.c: revision 1.49
 	sys/dev/ata/atavar.h: revision 1.105
 	sys/dev/ata/wd.c: revision 1.460
 	sys/dev/ata/ata.c: revision 1.155
 	sys/dev/ata/wd.c: revision 1.462
 	sys/dev/ata/atavar.h: revision 1.109
 	sys/dev/ata/satapmp_subr.c: revision 1.16
 	sys/dev/ic/wdc.c: revision 1.299
 	sys/dev/ic/ahcisata_core.c: revision 1.93
 	sys/dev/ata/ata_wdc.c: revision 1.120
 	sys/dev/ic/wdcvar.h: revision 1.100
 	sys/dev/scsipi/atapi_wdc.c: revision 1.141
 	sys/dev/ic/mvsata.c: revision 1.61
 	sys/dev/usb/umass_isdata.c	(apply patch)
 
 drop wd lock in wdstart1() before calling the ata_bio hook; when called
 from ata thread context, that can still need to sleep for wdc attachments
 in wdcwait()
 
 fix use-after-free for ata xfer on bio submission found by KASAN
 driver ata_bio hooks read parts of the xfer after ata_exec_xfer()
 call in order to determine return value, change so that the hook
 doesn't return any value - callers do not care already,
 as all I/O requests are asynchronous
 
 this problem was uncovered by recent change for wd(4) to not hold
 wd mutex during ata_bio call, the interrupt for the xfer might
 thus actually fire immediately
 
 adjust also ata_exec_command driver hooks similarily - remove all
 completion and waiting logic from drivers, upper layer ata code
 using AT_WAIT/AT_POLL changed to call ata_wait_cmd() itself
 PR kern/55169 by Nick Hudson
 
 Function declaration formating whitespace consistency.  NFCI.
 
 PR kern/56403
 Fix kernel freeze for wdc(4) variants with ATAC_CAP_NOIRQ:
 
 (1) Change ata_xfer_ops:c_poll from void to int function. When it returns
     ATAPOLL_AGAIN, let ata_xfer_start() iterate itself again.
 (2) Let wdc_ata_bio_poll() return ATAPOLL_AGAIN until ATA_ITSDONE is
     achieved.
 
 A similar change has been made for mvsata(4) (see mvsata_bio_poll()),
 and no functional changes for other devices.
 
 This is how the drivers worked before jdolecek-ncq branch was merged.
 Note that this changes are less likely to cause infinite recursion:
 
 (1) wdc_ata_bio_intr() called from wdc_ata_bio_poll() asserts ATA_ITSDONE
     in its error handling paths via wdc_ata_bio_done().
 (2) Return value from c_start (= wdc_ata_bio_start()) is checked in
     ata_xfer_start().
 
 Therefore, errors encountered in ata_xfer_ops:c_poll and c_start routines
 terminate the recursion for wdc(4). The situation is similar for mvsata(4).
 
 Still, there is a possibility where ata_xfer_start() takes long time to
 finish a normal operation. This can result in a delayed response for lower
 priority interrupts. But, I've never observed such a situation, even when
 heavy thrashing takes place for swap partition in wd(4).
 "Go ahead" by jdolecek@.
 
 
 To generate a diff of this commit:
 cvs rdiff -u -r1.149.2.2 -r1.149.2.3 src/sys/dev/ata/ata.c
 cvs rdiff -u -r1.2.8.1 -r1.2.8.2 src/sys/dev/ata/ata_recovery.c
 cvs rdiff -u -r1.113 -r1.113.4.1 src/sys/dev/ata/ata_wdc.c
 cvs rdiff -u -r1.103 -r1.103.4.1 src/sys/dev/ata/atavar.h
 cvs rdiff -u -r1.15 -r1.15.4.1 src/sys/dev/ata/satapmp_subr.c
 cvs rdiff -u -r1.452.2.2 -r1.452.2.3 src/sys/dev/ata/wd.c
 cvs rdiff -u -r1.75.4.4 -r1.75.4.5 src/sys/dev/ic/ahcisata_core.c
 cvs rdiff -u -r1.48 -r1.48.2.1 src/sys/dev/ic/mvsata.c
 cvs rdiff -u -r1.39 -r1.39.4.1 src/sys/dev/ic/siisata.c
 cvs rdiff -u -r1.291.4.1 -r1.291.4.2 src/sys/dev/ic/wdc.c
 cvs rdiff -u -r1.98.10.1 -r1.98.10.2 src/sys/dev/ic/wdcvar.h
 cvs rdiff -u -r1.133 -r1.133.4.1 src/sys/dev/scsipi/atapi_wdc.c
 cvs rdiff -u -r1.42 -r1.42.4.1 src/sys/dev/usb/umass_isdata.c
 
 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.