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android_kernel_motorola_sm6225/drivers
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Sven Van Asbroeck 90e5b27ceb pwm: pca9685: Fix PWM/GPIO inter-operation 
commit 9cc5f232a4b6a0ef6e9b57876d61b88f61bdd7c2 upstream.

This driver allows pwms to be requested as gpios via gpiolib. Obviously,
it should not be allowed to request a GPIO when its corresponding PWM is
already requested (and vice versa). So it requires some exclusion code.

Given that the PWMm and GPIO cores are not synchronized with respect to
each other, this exclusion code will also require proper
synchronization.

Such a mechanism was in place, but was inadvertently removed by Uwe's
clean-up in commit e926b12c611c ("pwm: Clear chip_data in pwm_put()").

Upon revisiting the synchronization mechanism, we found that
theoretically, it could allow two threads to successfully request
conflicting PWMs/GPIOs.

Replace with a bitmap which tracks PWMs in-use, plus a mutex. As long as
PWM and GPIO's respective request/free functions modify the in-use
bitmap while holding the mutex, proper synchronization will be
guaranteed.

Reported-by: YueHaibing <yuehaibing@huawei.com>
Fixes: e926b12c611c ("pwm: Clear chip_data in pwm_put()")
Cc: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Cc: YueHaibing <yuehaibing@huawei.com>
Link: https://lkml.org/lkml/2019/5/31/963
Signed-off-by: Sven Van Asbroeck <TheSven73@gmail.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
[cg: Tested on an i.MX6Q board with two NXP PCA9685 chips]
Tested-by: Clemens Gruber <clemens.gruber@pqgruber.com>
Reviewed-by: Sven Van Asbroeck <TheSven73@gmail.com> # cg's rebase
Link: https://lore.kernel.org/lkml/20200330160238.GD2817345@ulmo/
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-04-21 09:03:06 +02:00
..
accessibility
acpi x86/mm: split vmalloc_sync_all() 2020-03-25 08:06:13 +01:00
amba
android binder: Handle start==NULL in binder_update_page_range() 2019-12-13 08:52:52 +01:00
ata libata: Return correct status in sata_pmp_eh_recover_pm() when ATA_DFLAG_DETACH is set 2020-04-17 10:48:52 +02:00
atm fore200e: Fix incorrect checks of NULL pointer dereference 2020-02-24 08:34:42 +01:00
auxdisplay
base firmware: fix a double abort case with fw_load_sysfs_fallback 2020-04-17 10:48:42 +02:00
bcma bcma: fix incorrect update of BCMA_CORE_PCI_MDIO_DATA 2020-01-27 14:51:09 +01:00
block xen/blkfront: fix memory allocation flags in blkfront_setup_indirect() 2020-04-17 10:48:53 +02:00
bluetooth Bluetooth: btusb: fix PM leak in error case of setup 2020-01-09 10:19:04 +01:00
bus bus: sunxi-rsb: Return correct data when mixing 16-bit and 8-bit reads 2020-04-17 10:48:37 +02:00
cdrom cdrom: respect device capabilities during opening action 2020-01-04 19:13:12 +01:00
char ipmi: fix hung processes in __get_guid() 2020-04-17 10:48:53 +02:00
clk clk: ingenic/jz4770: Exit with error if CGU init failed 2020-04-17 10:48:52 +02:00
clocksource clocksource/drivers/bcm2835_timer: Fix memory leak of timer 2020-02-24 08:34:37 +01:00
connector
cpufreq cpufreq: powernv: Fix use-after-free 2020-04-17 10:48:52 +02:00
cpuidle cpuidle: Do not unset the driver if it is there already 2019-12-17 20:35:00 +01:00
crypto crypto: ccree - only try to map auth tag if needed 2020-04-17 10:48:54 +02:00
dax
dca
devfreq Revert "PM / devfreq: Modify the device name as devfreq(X) for sysfs" 2020-03-05 16:42:18 +01:00
dio
dma dmaengine: coh901318: Fix a double lock bug in dma_tc_handle() 2020-03-11 14:15:12 +01:00
dma-buf dma-buf: Fix memory leak in sync_file_merge() 2019-12-21 10:57:38 +01:00
edac EDAC/amd64: Set grain per DIMM 2020-03-11 14:14:45 +01:00
eisa
extcon extcon: axp288: Add wakeup support 2020-04-13 10:45:03 +02:00
firewire net: add annotations on hh->hh_len lockless accesses 2020-01-09 10:19:09 +01:00
firmware efi/x86: Ignore the memory attributes table on i386 2020-04-17 10:48:41 +02:00
fmc
fpga
fsi fsi: sbefifo: Don't fail operations when in SBE IPL state 2020-01-27 14:51:00 +01:00
gnss
gpio gpiolib: acpi: Add quirk to ignore EC wakeups on HP x2 10 CHT + AXP288 model 2020-04-02 15:28:23 +02:00
gpu etnaviv: perfmon: fix total and idle HI cyleces readout 2020-04-17 10:48:55 +02:00
hid HID: google: add moonball USB id 2020-03-20 11:55:59 +01:00
hsi
hv hv_balloon: Balloon up according to request page number 2020-02-11 04:34:01 -08:00
hwmon hwmon: (adt7462) Fix an error return in ADT7462_REG_VOLT() 2020-03-11 14:15:12 +01:00
hwspinlock
hwtracing intel_th: pci: Add Elkhart Lake CPU support 2020-03-25 08:06:11 +01:00
i2c i2c: st: fix missing struct parameter description 2020-04-17 10:48:38 +02:00
ide ide: serverworks: potential overflow in svwks_set_pio_mode() 2020-02-24 08:34:49 +01:00
idle
iio iio: light: vcnl4000: update sampling periods for vcnl4200 2020-03-25 08:06:13 +01:00
infiniband IB/mlx5: Replace tunnel mpls capability bits for tunnel_offloads 2020-04-17 10:48:43 +02:00
input Input: i8042 - add Acer Aspire 5738z to nomux list 2020-04-17 10:48:52 +02:00
iommu iommu/vt-d: Ignore devices with out-of-spec domain number 2020-03-18 07:14:24 +01:00
ipack
irqchip irqchip/versatile-fpga: Apply clear-mask earlier 2020-04-17 10:48:46 +02:00
isdn staging: gigaset: add endpoint-type sanity check 2019-12-17 20:34:33 +01:00
leds leds: pca963x: Fix open-drain initialization 2020-02-24 08:34:35 +01:00
lightnvm lightnvm: pblk: fix lock order in pblk_rb_tear_down_check 2020-01-27 14:50:45 +01:00
macintosh macintosh: windfarm: fix MODINFO regression 2020-03-18 07:14:21 +01:00
mailbox mailbox: qcom-apcs: fix max_register value 2020-01-27 14:51:14 +01:00
mcb
md dm zoned: remove duplicate nr_rnd_zones increase in dmz_init_zone() 2020-04-17 10:48:54 +02:00
media media: ti-vpe: cal: fix disable_irqs to only the intended target 2020-04-17 10:48:45 +02:00
memory memory: tegra: Don't invoke Tegra30+ specific memory timing setup on Tegra20 2020-01-27 14:50:13 +01:00
memstick
message scsi: mptfusion: Fix double fetch bug in ioctl 2020-01-23 08:21:28 +01:00
mfd mfd: dln2: Fix sanity checking for endpoints 2020-04-17 10:48:55 +02:00
misc misc: echo: Remove unnecessary parentheses and simplify check for zero 2020-04-17 10:48:55 +02:00
mmc mmc: sdhci-tegra: Fix busy detection by enabling MMC_CAP_NEED_RSP_BUSY 2020-04-02 15:28:10 +02:00
mtd mtd: spinand: Do not erase the block before writing a bad block marker 2020-04-17 10:48:48 +02:00
mux
net net: dsa: mt7530: fix tagged frames pass-through in VLAN-unaware mode 2020-04-21 09:03:05 +02:00
nfc NFC: fdp: Fix a signedness bug in fdp_nci_send_patch() 2020-04-02 15:28:12 +02:00
ntb ntb_hw_switchtec: potential shift wrapping bug in switchtec_ntb_init_sndev() 2020-01-27 14:50:55 +01:00
nubus
nvdimm libnvdimm/btt: fix variable 'rc' set but not used 2020-01-04 19:13:00 +01:00
nvme nvme: Treat discovery subsystems as unique subsystems 2020-04-17 10:48:45 +02:00
nvmem nvmem: imx-ocotp: Change TIMING calculation to u-boot algorithm 2020-01-27 14:50:58 +01:00
of drivers/of/of_mdio.c:fix of_mdiobus_register() 2020-04-02 15:28:14 +02:00
opp OPP: Fix missing debugfs supply directory for OPPs 2020-01-27 14:50:04 +01:00
oprofile
parisc
parport parport: load lowlevel driver if ports not found 2019-12-31 16:36:01 +01:00
pci PCI: endpoint: Fix for concurrent memory allocation in OB address region 2020-04-17 10:48:46 +02:00
pcmcia
perf drivers/perf: arm_pmu_acpi: Fix incorrect checking of gicc pointer 2020-03-25 08:06:07 +01:00
phy phy: mapphone-mdm6600: Fix write timeouts with shorter GPIO toggle interval 2020-03-11 14:15:10 +01:00
pinctrl pinctrl: core: Remove extra kref_get which blocks hogs being freed 2020-03-18 07:14:23 +01:00
platform platform/x86: pmc_atom: Add Lex 2I385SW to critclk_systems DMI table 2020-04-02 15:28:23 +02:00
pnp
power power: supply: axp288_charger: Add special handling for HP Pavilion x2 10 2020-04-13 10:45:04 +02:00
powercap
pps
ps3
ptp ptp: free ptp device pin descriptors properly 2020-01-23 08:21:35 +01:00
pwm pwm: pca9685: Fix PWM/GPIO inter-operation 2020-04-21 09:03:06 +02:00
rapidio drivers/rapidio/rio_cm.c: fix potential oops in riocm_ch_listen() 2020-01-27 14:50:31 +01:00
ras
regulator regulator: rk808: Lower log level on optional GPIOs being not available 2020-02-24 08:34:40 +01:00
remoteproc remoteproc: Initialize rproc_class before use 2020-02-24 08:34:50 +01:00
reset reset: uniphier: Add SCSSI reset control for each channel 2020-02-24 08:34:44 +01:00
rpmsg rpmsg: glink: Remove chunk size word align warning 2020-04-13 10:45:16 +02:00
rtc rtc: omap: Use define directive for PIN_CONFIG_ACTIVE_HIGH 2020-04-17 10:48:51 +02:00
s390 scsi: zfcp: fix missing erp_lock in port recovery trigger for point-to-point 2020-04-17 10:48:50 +02:00
sbus
scsi scsi: ufs: Fix ufshcd_hold() caused scheduling while atomic 2020-04-21 09:03:06 +02:00
sfi
sh
siox
slimbus slimbus: ngd: Fix build error on x86 2019-12-13 08:51:54 +01:00
sn
soc soc/tegra: fuse: Fix build with Tegra194 configuration 2020-03-05 16:42:13 +01:00
soundwire soundwire: intel: fix PDI/stream mapping for Bulk 2019-12-31 16:35:55 +01:00
spi spi/zynqmp: remove entry that causes a cs glitch 2020-03-25 08:06:06 +01:00
spmi
ssb
staging erofs: correct the remaining shrink objects 2020-04-17 10:48:49 +02:00
target scsi: Revert "target: iscsi: Wait for all commands to finish before freeing a session" 2020-02-28 16:38:58 +01:00
tc
tee tee: optee: Fix compilation issue with nommu 2020-02-05 14:43:50 +00:00
thermal thermal: brcmstb_thermal: Do not use DT coefficients 2020-03-05 16:42:22 +01:00
thunderbolt thunderbolt: Prevent crash if non-active NVMem file is read 2020-02-28 16:38:44 +01:00
tty vt: vt_ioctl: fix use-after-free in vt_in_use() 2020-04-02 15:28:23 +02:00
uio uio: fix a sleep-in-atomic-context bug in uio_dmem_genirq_irqcontrol() 2020-02-24 08:34:37 +01:00
usb usb: gadget: composite: Inform controller driver of self-powered 2020-04-17 10:48:44 +02:00
uwb
vfio vfio/mdev: Fix aborting mdev child device removal if one fails 2020-01-27 14:50:46 +01:00
vhost vhost: Check docket sk_family instead of call getname 2020-03-05 16:42:18 +01:00
video fbcon: fix null-ptr-deref in fbcon_switch 2020-04-13 10:45:14 +02:00
virt
virtio virtio_balloon: prevent pfn array overflow 2020-02-24 08:34:54 +01:00
visorbus visorbus: fix uninitialized variable access 2020-02-24 08:34:47 +01:00
vlynq
vme vme: bridges: reduce stack usage 2020-02-24 08:34:47 +01:00
w1 w1: IAD Register is yet readable trough iad sys file. Fix snprintf (%u for unsigned, count for max size). 2019-12-01 09:16:22 +01:00
watchdog watchdog: da9062: do not ping the hw during stop() 2020-03-11 14:14:53 +01:00
xen xenbus: req->err should be updated before req->state 2020-03-25 08:06:08 +01:00
zorro
Kconfig
Makefile