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linux/Documentation/driver-api
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Marco Pagani 9b4eee8572 fpga: region: add owner module and take its refcount 
[ Upstream commit b7c0e1ecee ]

The current implementation of the fpga region assumes that the low-level
module registers a driver for the parent device and uses its owner pointer
to take the module's refcount. This approach is problematic since it can
lead to a null pointer dereference while attempting to get the region
during programming if the parent device does not have a driver.

To address this problem, add a module owner pointer to the fpga_region
struct and use it to take the module's refcount. Modify the functions for
registering a region to take an additional owner module parameter and
rename them to avoid conflicts. Use the old function names for helper
macros that automatically set the module that registers the region as the
owner. This ensures compatibility with existing low-level control modules
and reduces the chances of registering a region without setting the owner.

Also, update the documentation to keep it consistent with the new interface
for registering an fpga region.

Fixes: 0fa20cdfcc ("fpga: fpga-region: device tree control for FPGA")
Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Suggested-by: Xu Yilun <yilun.xu@intel.com>
Reviewed-by: Russ Weight <russ.weight@linux.dev>
Signed-off-by: Marco Pagani <marpagan@redhat.com>
Acked-by: Xu Yilun <yilun.xu@intel.com>
Link: https://lore.kernel.org/r/20240419083601.77403-1-marpagan@redhat.com
Signed-off-by: Xu Yilun <yilun.xu@linux.intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2024-06-16 13:39:38 +02:00
..
80211 docs: net: 80211: reduce docs build time 2020-10-08 10:41:49 +02:00
acpi Documentation: ACPI: fix error script name 2021-06-17 13:21:48 -06:00
backlight docs: lp855x-driver.rst: add it to the driver-api book 2019-07-15 11:03:02 -03:00
cxl cxl/registers: Fix Documentation warning 2021-09-07 11:39:02 -07:00
dmaengine Documentation: dmaengine: Correctly describe dmatest with channel unset 2022-01-27 11:05:20 +01:00
driver-model pwm: Changes for v5.14-rc1 2021-07-08 12:18:04 -07:00
early-userspace Documentation: Fix intiramfs script name 2021-07-18 23:48:14 +09:00
firmware firmware: sysfb: Add sysfb_disable() helper function 2022-07-21 21:24:35 +02:00
fpga fpga: region: add owner module and take its refcount 2024-06-16 13:39:38 +02:00
gpio docs: gpio: explain GPIOD_OUT_* values and toggling active low 2021-07-21 15:21:36 +02:00
i3c docs: driver-api: i3c: Replace HTTP links with HTTPS ones 2020-07-13 09:32:36 -06:00
iio docs: iio: mark "repeat" sysfs attribute as optional 2021-03-11 20:47:08 +00:00
md docs: add SPDX tags to new index files 2019-07-15 11:03:03 -03:00
media media: Documentation: v4l: Rework LP-11 documentation, add callbacks 2021-08-04 14:43:50 +02:00
mei docs updates for v5.10-rc1 2020-10-16 15:02:21 -07:00
memory-devices Replace HTTP links with HTTPS ones: Documentation/driver-api 2020-06-26 11:09:04 -06:00
mmc Replace HTTP links with HTTPS ones: Documentation/driver-api 2020-06-26 11:09:04 -06:00
mtd MTD core: 2020-12-16 14:58:35 -08:00
nfc nfc: constify nfc_llc_ops 2021-07-25 09:21:21 +01:00
nvdimm MAINTAINERS: Move nvdimm mailing list 2021-05-12 12:37:15 -07:00
pci Documentation: Kill all references to mmiowb() 2019-04-08 12:00:45 +01:00
phy docs: phy: Drop duplicate 'be made' 2019-07-26 08:15:26 -06:00
pldmfw Add pldmfw library for PLDM firmware update 2020-07-28 17:07:06 -07:00
pm docs: devices.rst: better reference documentation docs 2021-06-17 13:24:36 -06:00
rapidio Replace HTTP links with HTTPS ones: Documentation/driver-api 2020-06-26 11:09:04 -06:00
serial mxser: Documentation, fix typos 2021-06-18 13:10:03 +02:00
soundwire docs: soundwire: fix some identation at stream.rst 2020-09-10 10:49:29 -06:00
surface_aggregator platform-drivers-x86 for v5.14-1 2021-06-30 11:15:39 -07:00
thermal Backmerge remote-tracking branch 'drm/drm-next' into drm-misc-next 2021-07-27 12:48:17 +02:00
usb USB / Thunderbolt patches for 5.14-rc1 2021-07-05 14:16:22 -07:00
xilinx firmware: xilinx: Remove zynqmp_pm_get_eemi_ops() in IS_REACHABLE(CONFIG_ZYNQMP_FIRMWARE) 2021-03-01 12:52:07 +01:00
auxiliary_bus.rst driver core: auxiliary bus: Fix typo in the docs 2021-05-27 15:45:50 +02:00
basics.rst docs: basics.rst: avoid duplicated C function declaration 2020-10-15 07:49:45 +02:00
clk.rst docs: clk: fix struct syntax 2019-06-07 11:35:15 -06:00
component.rst drm/doc: document recommended component helper usage 2019-02-19 12:22:24 +01:00
connector.rst net/connector: Add const qualifier to cb_id 2020-12-16 11:06:49 -08:00
console.rst docs: driver-api: add a series of orphaned documents 2019-07-15 11:03:02 -03:00
dcdbas.rst docs: driver-api: add a series of orphaned documents 2019-07-15 11:03:02 -03:00
devfreq.rst docs: Add initial documentation for devfreq 2019-11-19 13:16:53 -07:00
device-io.rst docs: driver-api: device-io: Document ioremap() variants & access funcs 2021-04-08 20:18:38 +09:00
device_link.rst docs: device_link.rst: remove duplicated kernel-doc include 2020-10-15 07:49:42 +02:00
dma-buf.rst dma-buf: Document DMA_BUF_IOCTL_SYNC (v3) 2021-06-17 21:46:37 +02:00
edac.rst edac.rst: move concepts dictionary from edac.h 2016-12-15 08:58:12 -02:00
eisa.rst docs: driver-api: add a series of orphaned documents 2019-07-15 11:03:02 -03:00
firewire.rst Documentation: fix firewire.rst ABI file path error 2022-01-27 11:05:21 +01:00
frame-buffer.rst docs: split up the driver book 2016-08-22 14:42:08 -06:00
generic-counter.rst counter: fix docum. build problems after filename change 2023-04-20 12:13:57 +02:00
hsi.rst docs: split up serial-interfaces.rst 2016-09-06 09:14:52 -06:00
i2c.rst Merge branch 'i2c/for-4.13' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2017-07-12 10:04:56 -07:00
index.rst remove the lightnvm subsystem 2021-08-14 15:54:09 -06:00
infiniband.rst RDMA/core: Remove FMR pool API 2020-06-02 20:32:53 -03:00
infrastructure.rst docs: infrastructure.rst: exclude device_link_state from device.h 2020-10-15 07:49:46 +02:00
input.rst Input: remove input_polled_dev implementation 2020-12-02 12:35:14 -08:00
interconnect.rst interconnect: Add interconnect_graph file to debugfs 2019-12-16 09:49:54 +02:00
io-mapping.rst io-mapping: Provide iomap_local variant 2020-11-24 14:42:09 +01:00
io_ordering.rst Documentation: Add io_ordering.rst to driver-api manual 2020-03-10 11:33:19 -06:00
ioctl.rst docs: driver-api: avoid using ReST :doc:foo markup 2021-06-17 13:24:37 -06:00
ipmb.rst drivers: ipmi: Support raw i2c packet in IPMB 2019-12-11 13:21:36 -06:00
ipmi.rst Minor cleanups to the IPMI driver for 5.9 2020-08-08 09:32:18 -07:00
isa.rst docs: driver-api: add a series of orphaned documents 2019-07-15 11:03:02 -03:00
isapnp.rst docs: driver-api: add a series of orphaned documents 2019-07-15 11:03:02 -03:00
libata.rst docs: libata.rst: fix a wrong usage of :c:type: tag 2020-10-15 07:49:44 +02:00
mailbox.rst docs: move mailbox.txt to driver-api and rename it 2020-06-26 11:33:38 -06:00
men-chameleon-bus.rst Documentation: document dma device use for mcb 2021-01-11 13:26:13 -07:00
message-based.rst docs: Don't format internal MPT docs 2016-09-06 09:15:48 -06:00
misc_devices.rst docs-rst: core_api: move driver-specific stuff to drivers_api 2017-04-02 14:17:43 -06:00
miscellaneous.rst docs: driver-api: Remove trailing blank line 2017-08-07 14:27:45 -06:00
mtdnand.rst docs: mtd: Avoid htmldocs warnings 2020-12-10 22:37:32 +01:00
ntb.rst Documentation/driver-api: ntb: drop doubled word 2020-07-13 11:18:17 -06:00
nvmem.rst nvmem: core: add nvmem_device_find 2019-10-07 09:47:37 -07:00
parport-lowlevel.rst docs: driver-api: add a series of orphaned documents 2019-07-15 11:03:02 -03:00
pin-control.rst docs/pinctrl: fix the reference to the u300 platform 2021-05-28 02:59:40 +02:00
pps.rst docs: driver-api: add remaining converted dirs to it 2019-07-15 11:03:03 -03:00
ptp.rst docs: ptp.rst: add support for Renesas (IDT) ClockMatrix 2020-07-17 10:25:21 -07:00
pwm.rst pwm: core: Remove unused devm_pwm_put() 2021-06-30 19:12:19 +02:00
regulator.rst docs: get rid of :c:type explicit declarations for structs 2020-10-15 07:49:40 +02:00
reset.rst docs: add a reset controller chapter to the driver API docs 2020-12-08 10:48:04 -07:00
rfkill.rst docs: driver-api: add a series of orphaned documents 2019-07-15 11:03:02 -03:00
s390-drivers.rst docs: s390: convert docs to ReST and rename to *.rst 2019-06-11 09:48:14 +02:00
scsi.rst scsi: target: add driver-api document 2018-04-20 19:14:40 -04:00
slimbus.rst slimbus: stream: add stream support 2018-07-07 17:25:23 +02:00
sm501.rst docs: driver-api: add a series of orphaned documents 2019-07-15 11:03:02 -03:00
spi.rst spi: Update reference to struct spi_controller 2022-12-31 13:14:08 +01:00
switchtec.rst docs: driver-api: add a series of orphaned documents 2019-07-15 11:03:02 -03:00
sync_file.rst docs: driver-api: add a series of orphaned documents 2019-07-15 11:03:02 -03:00
target.rst docs: scsi: target.rst: remove iSCSI transport class kernel-doc markup 2020-10-15 07:49:42 +02:00
uio-howto.rst Documentation/driver-api: uio-howto: drop doubled word 2020-07-10 14:58:01 +02:00
vfio-mediated-device.rst vfio/mdev: Allow the mdev_parent_ops to specify the device driver to bind 2021-06-21 15:29:25 -06:00
vfio.rst vfio: Introduce a vfio_uninit_group_dev() API call 2021-08-11 09:50:10 -06:00
vme.rst docs: Update VME documentation to include kerneldoc comments 2017-03-17 15:10:49 +09:00
w1.rst docs: driver-api: address duplicate label warning 2020-04-07 13:41:34 -06:00
xillybus.rst Documentation/driver-api: xillybus: drop doubled word 2020-07-10 14:58:01 +02:00
zorro.rst docs: driver-api: add a series of orphaned documents 2019-07-15 11:03:02 -03:00