This driver did not originally set kobj.parent so it likely had
potential a use after free bug which this patch fixes.
We convert from device_register to device_initialize/cdev_device_add.
While we are at it we use put_device instead of kfree (as recommended
by the device_initialize documentation). We also remove an unnecessary
extra get_device from the code.
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This is not as straightforward a conversion as the others
in this series. These drivers did not originally make use of
kobj.parent so they likely suffered from a use after free bug if
someone unregistered the devices while they are being used.
In order to make the conversions, switch from device_register
to device_initialize / cdev_device_add.
In build.c, this patch unwinds a complicated mess of extra
get_device/put_devices and reference tracking by moving device_initialize
early in the attach process. Then it always uses put_device and instead of
using device_unregister and extra get_devices everywhere we just use
cdev_device_del and one put_device once everything is completely done.
This simplifies things dramatically and makes it easier to reason about.
In vmt.c, the patch pushes device initialization up to the beginning of the
device creation and then that function only needs to use put_device
in the error path which simplifies things a good deal.
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Replace the open coded registration of the cdev and dev with the
new device_add_cdev() helper. The helper replaces a common pattern by
taking the proper reference against the parent device and adding both
the cdev and the device.
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Replace the open coded registration of the cdev and dev with the
new device_add_cdev() helper. The helper replaces a common pattern by
taking the proper reference against the parent device and adding both
the cdev and the device.
In doing so we have to remove a guard statement from cdev_del,
but this doesn't appear to be required in any way.
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This replaces the suspect looking cdev.kobj.parent lines with the
equivalent cdev_set_parent function. This is a straightforward change
that's largely cosmetic but it does push the kobj.parent ownership
into char_dev.c where it belongs.
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The use after free is not triggerable here because the cdev holds
the module lock and the only device_unregister is only triggered by
module unload, however make the change for consistency.
To make this work the cdev_del needs to move out of the struct device
release function.
This cleans up the error path significantly and thus also fixes a minor
bug where the devnum would not be released if cdev_add failed.
Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Replace the open coded registration of the cdev and dev with the
new device_add_cdev() helper. The helper replaces a common pattern by
taking the proper reference against the parent device and adding both
the cdev and the device.
At the same time we cleanup the error path through device_probe
function: we use put_device instead of kfree directly as recommended
by the device_initialize documentation.
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Replace the open coded registration of the cdev and dev with the
new device_add_cdev() helper. The helper replaces a common pattern by
taking the proper reference against the parent device and adding both
the cdev and the device.
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Replace the open coded registration of the cdev and dev with the
new device_add_cdev() helper. The helper replaces a common pattern by
taking the proper reference against the parent device and adding both
the cdev and the device.
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Replace the open coded registration of the cdev and dev with the
new device_add_cdev() helper in evdev, joydev and mousedev. The helper
replaces a common pattern by taking the proper reference against the
parent device and adding both the cdev and the device.
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Replace the open coded registration of the cdev and dev with the
new device_add_cdev() helper. The helper replaces a common pattern by
taking the proper reference against the parent device and adding both
the cdev and the device.
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
If device_add() fails, cleanup the cdev. Otherwise, we leak a kobj_map()
with a stale device number.
As Jason points out, there is a small possibility that userspace has
opened and mapped the device in the time between cdev_add() and the
device_add() failure. We need a new kill_dax_dev() helper to invalidate
any established mappings.
Fixes: ba09c01d2f ("dax: convert to the cdev api")
Cc: <stable@vger.kernel.org>
Reported-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The Hitachi HD44780 Character LCD Controller is commonly used on
character LCDs that can display one or more lines of text.
This driver supports character LCDs connected to GPIOs, using either a
4-bit or 8-bit data bus, and provides access through the charlcd core
and /dev/lcd.
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
On displays with more than two lines, the additional lines are stored in
the buffers used for the first two lines, but beyond the visible parts.
Adjust the DDRAM address calculation to cater for this.
When clearing the display, avoid writing more spaces than the actual
size of the physical buffer.
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
In 4-bit mode, 8-bit commands and data are written using two raw writes
to the data interface: high nibble first, low nibble last. This must be
handled by the low-level driver.
However, as we don't know in which mode (4-bit or 8-bit) nor 4-bit phase
the LCD was left, initialization must always be handled using raw
writes, and needs to configure the LCD for 8-bit mode first.
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Extract the character LCD core from the Parallel port LCD/Keypad Panel
driver in the misc subsystem, and convert it into a subdriver in the
auxdisplay subsystem. This allows the character LCD core to be used by
other drivers later.
Compilation is controlled by its own Kconfig symbol CHARLCD, which is to
be selected by its users, but can be enabled manually for
compile-testing.
All functions changed their prefix from "lcd_" to "charlcd_", and gained
a "struct charlcd *" parameter to operate on a specific instance.
While the driver API thus is ready to support multiple instances, the
current limitation of a single display (/dev/lcd has a single misc minor
assigned) is retained.
No functional changes intended.
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To enable eventual removal of pr_warning
This makes pr_warn use consistent for drivers/char
Prior to this patch, there were 1 use of pr_warning and
40 uses of pr_warn in drivers/char
Signed-off-by: Joe Perches <joe@perches.com>
Reviewed-by: Amit Shah <amit@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Detailed information about support and provided sysfs files
in my next commit which creates a documentation file:
Documentation/w1/slaves/w1_ds2438
Signed-off-by: Mariusz Bialonczyk <manio@skyboo.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Issue is that x86 32-bit aligns to 4-bytes instead of 8-bytes
so this patchset works around the issue and corrects the data
returned in pps_fdata_compat.
Acked-by: Rodolfo Giometti <giometti@enneenne.com>
Signed-off-by: Matt Ranostay <matt.ranostay@konsulko.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
ioctl definitions use the pointer size of the architecture which
is fine when userspace and kernel are the same bitsize. This
patchset workarounds an issue with mixed bitsize kernel + userspace
by rewriting the cmd to the kernelspace architecture pointer size.
Acked-by: Rodolfo Giometti <giometti@enneenne.com>
Signed-off-by: Matt Ranostay <matt.ranostay@konsulko.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Add kernel-doc comments to the VME driver API and structures. This
documentation will be integrated into the RST documentation in a later
patch.
Signed-off-by: Martyn Welch <martyn.welch@collabora.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The value passed by the two callers of the function is unsigned anyway.
Making the parameter unsigned fixes the following warning when building
with clang:
drivers/char/hpet.c:588:7: error: overflow converting case value to switch condition type (2149083139 to 18446744071563667459) [-Werror,-Wswitch]
case HPET_INFO:
^
include/uapi/linux/hpet.h:18:19: note: expanded from macro 'HPET_INFO'
^
include/uapi/asm-generic/ioctl.h:77:28: note: expanded from macro '_IOR'
^
include/uapi/asm-generic/ioctl.h:66:2: note: expanded from macro '_IOC'
(((dir) << _IOC_DIRSHIFT) | \
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Acked-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
In order to manage server systems, there is typically another processor
known as a BMC (Baseboard Management Controller) which is responsible
for powering the server and other various elements, sometimes fans,
often the system flash.
The Aspeed BMC family which is what is used on OpenPOWER machines and a
number of x86 as well is typically connected to the host via an LPC
(Low Pin Count) bus (among others).
The LPC bus is an ISA bus on steroids. It's generally used by the
BMC chip to provide the host with access to the system flash (via MEM/FW
cycles) that contains the BIOS or other host firmware along with a
number of SuperIO-style IOs (via IO space) such as UARTs, IPMI
controllers.
On the BMC chip side, this is all configured via a bunch of registers
whose content is related to a given policy of what devices are exposed
at a per system level, which is system/vendor specific, so we don't want
to bolt that into the BMC kernel. This started with a need to provide
something nicer than /dev/mem for user space to configure these things.
One important aspect of the configuration is how the MEM/FW space is
exposed to the host (ie, the x86 or POWER). Some registers in that
bridge can define a window remapping all or portion of the LPC MEM/FW
space to a portion of the BMC internal bus, with no specific limits
imposed in HW.
I think it makes sense to ensure that this window is configured by a
kernel driver that can apply some serious sanity checks on what it is
configured to map.
In practice, user space wants to control this by flipping the mapping
between essentially two types of portions of the BMC address space:
- The flash space. This is a region of the BMC MMIO space that
more/less directly maps the system flash (at least for reads, writes
are somewhat more complicated).
- One (or more) reserved area(s) of the BMC physical memory.
The latter is needed for a number of things, such as avoiding letting
the host manipulate the innards of the BMC flash controller via some
evil backdoor, we want to do flash updates by routing the window to a
portion of memory (under control of a mailbox protocol via some
separate set of registers) which the host can use to write new data in
bulk and then request the BMC to flash it. There are other uses, such
as allowing the host to boot from an in-memory flash image rather than
the one in flash (very handy for continuous integration and test, the
BMC can just download new images).
It is important to note that due to the way the Aspeed chip lets the
kernel configure the mapping between host LPC addresses and BMC ram
addresses the offset within the window must be a multiple of size.
Not doing so will fragment the accessible space rather than simply
moving 'zero' upwards. This is caused by the nature of HICR8 being a
mask and the way host LPC addresses are translated.
Signed-off-by: Cyril Bur <cyrilbur@gmail.com>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Instead of creating attributes one by one, define attribute_group array
and attach it to bus->dev_groups, so that all needed attributes are created
automatically when a new device is registered on the bus.
Also switch to using standard DEVICE_ATTR_RO() macros.
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Instead of creating switch-specific attributes by hand, implement
is_visible() method of attribute group and hide them when dealing with
non-switch devices. This will ensure that all attributes are created
together, before userspace gets notified of new device.
Also, remove rio-sysfs.c from list of files that are scanned when compiling
RapiodIO documentations as it no longer has any structured comments, and
leaving it in leads to warning when building docs.
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Don't enable auto-eoi if the hypervisor recommends otherwise. This will
enable vAPIC functionality if available.
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This table is immutable and should be const.
Cleanup indentation and whitespace for this as well.
Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The change to reschedule tasklet if more data arrives in ring buffer
can cause performance regression if host timing is such that the
next response happens in small window.
Go back to a modified version of the original looping behavior.
If the race occurs in a small time, then loop. But if the tasklet
has been running for a long interval due to flood, then reschedule
the tasklet to allow migration to ksoftirqd.
Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Add support for loading bitstreams on the Altera Cyclone II FPGA
populated on the TS-7300 board. This is done through the configuration
and data registers offered through a memory interface between the EP93xx
SoC and the FPGA via an intermediate CPLD device.
The EP93xx SoC on the TS-7300 does not have direct means of configuring
the on-board FPGA other than by using the special memory mapped
interface to the CPLD. No other entity on the system can control the
FPGA bitstream.
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Alan Tull <atull@opensource.altera.com>
Acked-by: Moritz Fischer <moritz.fischer@ettus.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Add fpga-region property to allow passing the fact that the bitstream is
encrypted to the fpga-region and ultimately to the low-level driver.
Signed-off-by: Moritz Fischer <mdf@kernel.org>
Acked-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Alan Tull <atull@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Add support for encrypted bitstreams. For this to work the system
must be booted in secure mode.
In order for on-the-fly decryption to work, the PCAP clock rate
needs to be lowered via the PCAP_RATE_EN bit.
Signed-off-by: Moritz Fischer <mdf@kernel.org>
Acked-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Alan Tull <atull@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Fix up these sparse warnings:
drivers/fpga/fpga-mgr.c:189:21: warning: symbol '__fpga_mgr_get' was not declared. Should it be static?
drivers/fpga/fpga-bridge.c:30:12: warning: symbol 'bridge_list_lock' was not declared. Should it be static?
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
Acked-by: Moritz Fischer <mdf@kernel.org>
Signed-off-by: Alan Tull <atull@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Pull irq fixes from Thomas Gleixner:
- a workaround for a GIC erratum
- a missing stub function for CONFIG_IRQDOMAIN=n
- fixes for a couple of type inconsistencies
* 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
irqchip/crossbar: Fix incorrect type of register size
irqchip/gicv3-its: Add workaround for QDF2400 ITS erratum 0065
irqdomain: Add empty irq_domain_check_msi_remap
irqchip/crossbar: Fix incorrect type of local variables
Pull random updates from Ted Ts'o:
"Change get_random_{int,log} to use the CRNG used by /dev/urandom and
getrandom(2). It's faster and arguably more secure than cut-down MD5
that we had been using.
Also do some code cleanup"
* tag 'random_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/random:
random: move random_min_urandom_seed into CONFIG_SYSCTL ifdef block
random: convert get_random_int/long into get_random_u32/u64
random: use chacha20 for get_random_int/long
random: fix comment for unused random_min_urandom_seed
random: remove variable limit
random: remove stale urandom_init_wait
random: remove stale maybe_reseed_primary_crng
Pull tty/serial fixes frpm Greg KH:
"Here are two bugfixes for tty stuff for 4.11-rc2.
One of them resolves the pretty bad bug in the n_hdlc code that
Alexander Popov found and fixed and has been reported everywhere. The
other just fixes a samsung serial driver issue when DMA fails on some
systems.
Both have been in linux-next with no reported issues"
* tag 'tty-4.11-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
serial: samsung: Continue to work if DMA request fails
tty: n_hdlc: get rid of racy n_hdlc.tbuf
Pull staging driver fixes from Greg KH:
"Here are two small build warning fixes for some staging drivers that
Arnd has found on his valiant quest to get the kernel to build
properly with no warnings.
Both of these have been in linux-next this week and resolve the
reported issues"
* tag 'staging-4.11-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging:
staging: octeon: remove unused variable
staging/vc04_services: add CONFIG_OF dependency
Pull USB fixes from Greg KH:
"Here is a number of different USB fixes for 4.11-rc2.
Seems like there were a lot of unresolved issues that people have been
finding for this subsystem, and a bunch of good security auditing
happening as well from Johan Hovold. There's the usual batch of gadget
driver fixes and xhci issues resolved as well.
All of these have been in linux-next with no reported issues"
* tag 'usb-4.11-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (35 commits)
usb: host: xhci-plat: Fix timeout on removal of hot pluggable xhci controllers
usb: host: xhci-dbg: HCIVERSION should be a binary number
usb: xhci: remove dummy extra_priv_size for size of xhci_hcd struct
usb: xhci-mtk: check hcc_params after adding primary hcd
USB: serial: digi_acceleport: fix OOB-event processing
MAINTAINERS: usb251xb: remove reference inexistent file
doc: dt-bindings: usb251xb: mark reg as required
usb: usb251xb: dt: add unit suffix to oc-delay and power-on-time
usb: usb251xb: remove max_{power,current}_{sp,bp} properties
usb-storage: Add ignore-residue quirk for Initio INIC-3619
USB: iowarrior: fix NULL-deref in write
USB: iowarrior: fix NULL-deref at probe
usb: phy: isp1301: Add OF device ID table
usb: ohci-at91: Do not drop unhandled USB suspend control requests
USB: serial: safe_serial: fix information leak in completion handler
USB: serial: io_ti: fix information leak in completion handler
USB: serial: omninet: drop open callback
USB: serial: omninet: fix reference leaks at open
USB: serial: io_ti: fix NULL-deref in interrupt callback
usb: dwc3: gadget: make to increment req->remaining in all cases
...
Pull pinctrl fixes from Linus Walleij:
"Two smaller pin control fixes for the v4.11 series:
- Add a get_direction() function to the qcom driver
- Fix two pin names in the uniphier driver"
* tag 'pinctrl-v4.11-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl:
pinctrl: uniphier: change pin names of aio/xirq for LD11
pinctrl: qcom: add get_direction function
Pull ceph fixes from Ilya Dryomov:
- a fix for the recently discovered misdirected requests bug present in
jewel and later on the server side and all stable kernels
- a fixup for -rc1 CRUSH changes
- two usability enhancements: osd_request_timeout option and
supported_features bus attribute.
* tag 'ceph-for-4.11-rc2' of git://github.com/ceph/ceph-client:
libceph: osd_request_timeout option
rbd: supported_features bus attribute
libceph: don't set weight to IN when OSD is destroyed
libceph: fix crush_decode() for older maps
Pull i2c fixes from Wolfram Sang:
"Here are some driver bugfixes from I2C.
Unusual this time are the two reverts. One because I accidently picked
a patch from the list which I should have pulled from my co-maintainer
instead ("missing of_node_put"). And one which I wrongly assumed to be
an easy fix but it turned out already that it needs more iterations
("copy device properties")"
* 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
Revert "i2c: copy device properties when using i2c_register_board_info()"
Revert "i2c: add missing of_node_put in i2c_mux_del_adapters"
i2c: exynos5: Avoid transaction timeouts due TRANSFER_DONE_AUTO not set
i2c: designware: add reset interface
i2c: meson: fix wrong variable usage in meson_i2c_put_data
i2c: copy device properties when using i2c_register_board_info()
i2c: m65xx: drop superfluous quirk structure
i2c: brcmstb: Fix START and STOP conditions
i2c: add missing of_node_put in i2c_mux_del_adapters
i2c: riic: fix restart condition
i2c: add missing of_node_put in i2c_mux_del_adapters
