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134b23eec9
linux/drivers
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Saravana Kannan 134b23eec9 driver core: Add edit_links() callback for drivers 
The driver core/bus adding supplier-consumer dependencies by default
enables functional dependencies to be tracked correctly even when the
consumer devices haven't had their drivers registered or loaded (if they
are modules).

However, when the bus incorrectly adds dependencies that it shouldn't
have added, the devices might never probe.

For example, if device-C is a consumer of device-S and they have
phandles to each other in DT, the following could happen:

1.  Device-S get added first.
2.  The bus add_links() callback will (incorrectly) try to link it as
    a consumer of device-C.
3.  Since device-C isn't present, device-S will be put in
    "waiting-for-supplier" list.
4.  Device-C gets added next.
5.  All devices in "waiting-for-supplier" list are retried for linking.
6.  Device-S gets linked as consumer to Device-C.
7.  The bus add_links() callback will (correctly) try to link it as
    a consumer of device-S.
8.  This isn't allowed because it would create a cyclic device links.

Neither devices will get probed since the supplier is marked as
dependent on the consumer. And the consumer will never probe because the
consumer can't get resources from the supplier.

Without this patch, things stay in this broken state. However, with this
patch, the execution will continue like this:

9.  Device-C's driver is loaded.
10. Device-C's driver removes Device-S as a consumer of Device-C.
11. Device-C's driver adds Device-C as a consumer of Device-S.
12. Device-S probes.
14. Device-C probes.

kbuild test robot reported missing documentation for device.has_edit_links
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Saravana Kannan <saravanak@google.com>
Link: https://lore.kernel.org/r/20190731221721.187713-3-saravanak@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-08-01 16:04:13 +02:00
..
accessibility
acpi Merge branch 'akpm' (patches from Andrew) 2019-07-19 09:45:58 -07:00
amba drivers: Introduce device lookup variants by of_node 2019-07-30 13:07:41 +02:00
android
ata for-5.3/libata-20190708 2019-07-09 10:59:26 -07:00
atm atm: idt77252: Remove call to memset after dma_alloc_coherent 2019-07-15 11:06:27 -07:00
auxdisplay It's been a relatively busy cycle for docs: 2019-07-09 12:34:26 -07:00
base driver core: Add edit_links() callback for drivers 2019-08-01 16:04:13 +02:00
bcma
block Lots of exciting things this time! 2019-07-18 11:05:25 -07:00
bluetooth Bluetooth: btusb: Add protocol support for MediaTek MT7663U USB devices 2019-07-06 21:44:25 +02:00
bus ARM: SoC-related driver updates 2019-07-19 17:13:56 -07:00
cdrom
char docs: admin-guide: add a series of orphaned documents 2019-07-15 11:03:02 -03:00
clk This round of clk driver and framework updates is heavy on the driver update 2019-07-17 10:07:48 -07:00
clocksource clocksource/drivers/npcm: Fix misuse of GENMASK macro 2019-07-10 11:05:26 +02:00
connector
counter Staging / IIO driver update for 5.3-rc1 2019-07-11 15:36:02 -07:00
cpufreq Merge branch 'pm-cpufreq' 2019-07-18 09:49:30 +02:00
cpuidle Merge branch 'pm-cpufreq' 2019-07-18 09:49:30 +02:00
crypto Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2019-07-19 12:23:37 -07:00
dax Merge branch 'work.mount0' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-07-19 10:42:02 -07:00
dca
devfreq
dio
dma dmaengine updates for v5.3-rc1 2019-07-17 09:55:43 -07:00
dma-buf Merge branch 'work.mount0' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-07-19 10:42:02 -07:00
edac
eisa
extcon
firewire
firmware ARM: SoC-related driver updates 2019-07-19 17:13:56 -07:00
fpga drivers: Introduce device lookup variants by of_node 2019-07-30 13:07:41 +02:00
fsi
gnss
gpio GPIO fixes for the v5.3 merge window: 2019-07-17 13:05:21 -07:00
gpu platform: Add platform_find_device_by_driver() helper 2019-07-30 13:07:42 +02:00
hid Linux 5.2 2019-07-15 09:42:32 -07:00
hsi
hv proc/sysctl: add shared variables for range check 2019-07-18 17:08:07 -07:00
hwmon ARM: SoC-related driver updates 2019-07-19 17:13:56 -07:00
hwspinlock
hwtracing drivers: Introduce device lookup variants by device type 2019-07-30 13:07:42 +02:00
i2c i2c: Revert incorrect conversion to use generic helper 2019-08-01 16:04:13 +02:00
i3c * Drop support for 10-bit I2C addresses 2019-07-09 09:04:31 -07:00
ide It's been a relatively busy cycle for docs: 2019-07-09 12:34:26 -07:00
idle
iio Driver Core and debugfs changes for 5.3-rc1 2019-07-12 12:24:03 -07:00
infiniband drivers: Introduce device lookup variants by fwnode 2019-07-30 13:07:42 +02:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2019-07-20 12:22:30 -07:00
interconnect
iommu drivers: Introduce device lookup variants by fwnode 2019-07-30 13:07:42 +02:00
ipack TTY / Serial driver updates for 5.3-rc1 2019-07-11 15:38:21 -07:00
irqchip irqchip/gic-v3-its: Fix misuse of GENMASK macro 2019-07-10 11:04:17 +02:00
isdn ISDN: hfcsusb: checking idx of ep configuration 2019-07-15 11:10:31 -07:00
leds drivers: Introduce device lookup variants by name 2019-07-30 13:07:41 +02:00
lightnvm
macintosh powerpc updates for 5.3 2019-07-13 16:08:36 -07:00
mailbox - stm32: race fix by adding a spinlock 2019-07-14 16:36:51 -07:00
mcb
md - Fix zone state management race in DM zoned target by eliminating 2019-07-18 14:49:33 -07:00
media Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2019-07-11 10:55:49 -07:00
memory Kbuild updates for v5.3 (2nd) 2019-07-20 09:34:55 -07:00
memstick MMC core: 2019-07-11 18:11:21 -07:00
message SCSI misc on 20190709 2019-07-11 15:14:01 -07:00
mfd mfd: aat2870: no need to check return value of debugfs_create functions 2019-08-01 08:06:59 +02:00
misc drivers: Introduce device lookup variants by device type 2019-07-30 13:07:42 +02:00
mmc MMC core: 2019-07-11 18:11:21 -07:00
mtd docs: mtd: move it to the driver-api book 2019-07-15 09:20:28 -03:00
mux drivers: Introduce device lookup variants by of_node 2019-07-30 13:07:41 +02:00
net drivers: Introduce device lookup variants by fwnode 2019-07-30 13:07:42 +02:00
nfc
ntb New feature to add support for NTB virtual MSI interrupts, the ability 2019-07-21 09:46:59 -07:00
nubus
nvdimm Merge branch 'akpm' (patches from Andrew) 2019-07-19 09:45:58 -07:00
nvme for-linus-20190715 2019-07-15 21:20:52 -07:00
nvmem drivers: Introduce device lookup variants by of_node 2019-07-30 13:07:41 +02:00
of drivers: Introduce device lookup variants by of_node 2019-07-30 13:07:41 +02:00
opp pci-v5.3-changes 2019-07-15 20:44:49 -07:00
oprofile
parisc
parport It's been a relatively busy cycle for docs: 2019-07-09 12:34:26 -07:00
pci drivers: Add generic helper to match any device 2019-07-30 13:07:42 +02:00
pcmcia It's been a relatively busy cycle for docs: 2019-07-09 12:34:26 -07:00
perf docs: perf: move to the admin-guide 2019-07-15 09:20:27 -03:00
phy
pinctrl This is the bulk of pin control changes for the v5.3 kernel 2019-07-13 15:02:27 -07:00
platform platform/x86: asus: Rename "fan mode" to "fan boost mode" 2019-07-17 19:07:58 +03:00
pnp docs: driver-api: add a series of orphaned documents 2019-07-15 11:03:02 -03:00
power power supply and reset changes for the v5.3 series 2019-07-15 21:06:15 -07:00
powercap powercap/rapl: Add Ice Lake NNPI support to RAPL driver 2019-07-11 15:08:58 +02:00
pps drivers/pps/pps.c: clear offset flags in PPS_SETPARAMS ioctl 2019-07-16 19:23:24 -07:00
ps3
ptp
pwm pwm: Changes for v5.3-rc1 2019-07-09 08:57:45 -07:00
rapidio Merge branch 'akpm' (patches from Andrew) 2019-07-17 08:58:04 -07:00
ras
regulator drivers: Introduce device lookup variants by of_node 2019-07-30 13:07:41 +02:00
remoteproc remoteproc updates for v5.3 2019-07-17 11:44:41 -07:00
reset ARM: SoC-related driver updates 2019-07-19 17:13:56 -07:00
rpmsg
rtc drivers: Introduce device lookup variants by name 2019-07-30 13:07:41 +02:00
s390 drivers: Add generic helper to match any device 2019-07-30 13:07:42 +02:00
sbus
scsi drivers: Add generic helper to match any device 2019-07-30 13:07:42 +02:00
sfi
sh
siox
slimbus
sn
soc ARM: Device-tree updates 2019-07-19 17:19:24 -07:00
soundwire soundwire updates for v5.3-rc1 2019-07-05 08:15:08 +02:00
spi drivers: Introduce device lookup variants by ACPI_COMPANION device 2019-07-30 13:07:42 +02:00
spmi
ssb
staging docs conversion for v5.3-rc1 2019-07-16 12:21:41 -07:00
target SCSI misc on 20190709 2019-07-11 15:14:01 -07:00
tc
tee
thermal More power management updates for 5.3-rc1 2019-07-18 09:32:28 -07:00
thunderbolt Driver Core and debugfs changes for 5.3-rc1 2019-07-12 12:24:03 -07:00
tty drivers: Introduce device lookup variants by device type 2019-07-30 13:07:42 +02:00
uio
usb drivers: Introduce device lookup variants by device type 2019-07-30 13:07:42 +02:00
uwb
vfio VFIO updates for v5.3-rc1 2019-07-17 11:23:13 -07:00
vhost virtio, vhost: fixes, features, performance 2019-07-17 11:26:09 -07:00
video - New Functionality 2019-07-16 09:25:04 -07:00
virt
virtio Merge branch 'work.mount0' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-07-19 10:42:02 -07:00
visorbus
vlynq
vme
w1 docs: driver-api: add a series of orphaned documents 2019-07-15 11:03:02 -03:00
watchdog watchdog: digicolor_wdt: Remove unused variable in dc_wdt_probe 2019-07-15 08:49:11 +02:00
xen xen: fixes and features for 5.3-rc1 2019-07-19 11:41:26 -07:00
zorro
Kconfig
Makefile