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Elias Vanderstuyft 33b96d9349 Input: document and check on implicitly defined FF_MAX_EFFECTS 
There is an undocumented upper bound for the total number of ff effects:
    FF_GAIN (= 96).
This can be found as follows:
- user: write(EV_FF, effect_id, iterations)
    calls kernel: ff->playback(effect_id, ...): starts effect "effect_id"
- user: write(EV_FF, FF_GAIN, gain)
    calls kernel: ff->set_gain(gain, ...): sets gain

A collision occurs when effect_id equals FF_GAIN.
According to input_ff_event(),
FF_GAIN is the smallest value where a collision occurs.
Therefore the greatest safe value for effect_id is FF_GAIN - 1,
and thus the total number of effects should never exceed FF_GAIN.

Define FF_MAX_EFFECTS as FF_GAIN and check on this limit in ff-core.

Signed-off-by: Elias Vanderstuyft <elias.vds@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
2015-10-16 15:32:16 -07:00
..
accessibility printk: move braille console support into separate braille.[ch] files 2013-07-31 14:41:03 -07:00
acpi Merge branch 'acpi-ec' 2015-10-01 22:30:35 +02:00
amba
android mm: mark most vm_operations_struct const 2015-09-10 13:29:01 -07:00
ata Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2015-09-03 16:55:55 -07:00
atm solos-pci: Increase headroom on received packets 2015-09-17 21:29:07 -07:00
auxdisplay
base Merge branches 'pm-cpuidle', 'pm-opp' and 'pm-tools' 2015-10-01 22:30:47 +02:00
bcma
block blk-mq: fix racy updates of rq->errors 2015-10-01 10:10:55 +02:00
bluetooth Bluetooth: hci_bcm: Fix crash on suspend 2015-08-28 21:09:14 +02:00
bus regmap: Changes for v4.3 2015-09-08 16:48:55 -07:00
cdrom block,scsi: fixup blk_get_request dead queue scenarios 2014-08-28 10:03:46 -06:00
char Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2015-09-26 21:05:23 -04:00
clk A few driver fixes for tegra, rockchip, and st SoCs and a two-liner 2015-09-19 20:17:40 -07:00
clocksource clocksource/drivers/keystone: Fix bad NO_IRQ usage 2015-09-29 14:33:51 +02:00
connector kconfig: use bool instead of boolean for type definition attributes 2015-01-07 13:08:04 +01:00
cpufreq cpufreq: acpi-cpufreq: Use cpufreq_cpu_get_raw() in ->get() 2015-09-16 02:17:49 +02:00
cpuidle Additional power management and ACPI material for v4.3-rc1 2015-09-11 19:11:06 -07:00
crypto Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 2015-09-26 21:05:23 -04:00
dca dca: convert to idr_alloc() 2013-02-27 19:10:15 -08:00
devfreq PM / devfreq: Fix incorrect type issue. 2015-09-11 14:23:30 +09:00
dio m68k: don't export static inline functions 2009-12-06 11:18:28 +01:00
dma dmaengine fixes for 4.3-rc4 2015-10-02 14:46:15 -04:00
dma-buf dma-buf: Minor coding style fixes 2015-05-21 11:29:59 +05:30
edac edac updates for v4.3-rc1 2015-09-11 16:21:12 -07:00
eisa Revert "EISA: Initialize device before its resources" 2014-01-17 14:57:29 -07:00
extcon extcon: Fix attached value returned by is_extcon_changed 2015-09-21 15:07:19 +09:00
firewire scsi: Do not set cmd_per_lun to 1 in the host template 2015-05-31 18:06:28 -07:00
firmware arm64/efi: Fix boot crash by not padding between EFI_MEMORY_RUNTIME regions 2015-10-01 12:51:28 +02:00
fmc
gpio Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-09-18 08:11:42 -07:00
gpu drm/dp/mst: add some defines for logical/physical ports 2015-10-02 15:34:42 +10:00
hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2015-09-04 12:02:11 -07:00
hsi mm: mark most vm_operations_struct const 2015-09-10 13:29:01 -07:00
hv Drivers: hv: vmbus: fix init_vp_index() for reloading hv_netvsc 2015-09-20 22:44:51 -07:00
hwmon hwmon: (pwm-fan) Fix module autoload for OF platform driver 2015-09-20 17:50:19 -07:00
hwspinlock hwspinlock: qcom: Correct msb in regmap_field 2015-07-01 16:15:05 +03:00
hwtracing/coresight coresight-etm4x: Support context-ID tracing when PID namespace is enabled 2015-08-05 13:30:15 -07:00
i2c Merge branch 'i2c/for-4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux 2015-09-08 16:16:26 -07:00
ide Minor merge needed, due to function move. 2015-07-01 10:49:25 -07:00
idle intel_idle: Skylake Client Support - updated 2015-09-10 14:03:44 -04:00
iio This is the bulk of GPIO changes for the v4.3 kernel cycle: 2015-09-04 10:07:45 -07:00
infiniband Changes for 4.3-rc4 2015-10-01 16:38:52 -04:00
input Input: document and check on implicitly defined FF_MAX_EFFECTS 2015-10-16 15:32:16 -07:00
iommu Merge git://git.infradead.org/intel-iommu 2015-10-02 07:59:29 -04:00
ipack ipoctal: clear break interrupt as soon as it occurs 2014-09-23 23:26:42 -07:00
irqchip Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-10-04 11:40:09 +01:00
isdn libnvdimm for 4.3: 2015-09-08 14:35:59 -07:00
leds leds:lp55xx: Correct Kconfig dependency for f/w user helper 2015-09-17 10:02:20 +02:00
lguest Merge branch 'x86-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-06-22 17:59:09 -07:00
macintosh powerpc updates for 4.3 2015-09-03 16:41:38 -07:00
mailbox Merge branch 'mailbox-for-next' of git://git.linaro.org/landing-teams/working/fujitsu/integration 2015-09-05 18:11:04 -07:00
mcb mcb: request_mem_region() returns NULL on error 2015-04-03 16:15:30 +02:00
md Assorted fixes for md in 4.3-rc 2015-10-04 11:47:28 +01:00
media media updates for v4.3-rc1 2015-09-11 16:42:39 -07:00
memory IOMMU Updates for Linux v4.3 2015-09-08 17:22:35 -07:00
memstick memstick: remove deprecated use of pci api 2015-06-30 19:44:57 -07:00
message mptfusion: prevent some memory corruption 2015-08-26 07:11:45 -07:00
mfd genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
misc Char/Misc driver fixes for 4.3-rc3 2015-09-26 20:53:15 -04:00
mmc mmc: core: fix dead loop of mmc_retune 2015-09-30 14:54:22 +02:00
mtd UBI: return ENOSPC if no enough space available 2015-09-29 12:47:05 +02:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-10-01 21:55:35 -04:00
nfc This is the bulk of GPIO changes for the v4.3 kernel cycle: 2015-09-04 10:07:45 -07:00
ntb NTB: Fix range check on memory window index 2015-09-07 15:27:12 -04:00
nubus nubus: Remove superfluous interrupt disable/restore 2014-10-27 11:03:19 +01:00
nvdimm pmem: add proper fencing to pmem_rw_page() 2015-09-17 11:49:28 -04:00
nvmem
of Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-09-26 06:01:33 -04:00
oprofile Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-04-26 17:22:07 -07:00
parisc PCI: Revert "PCI: Call pci_read_bridge_bases() from core instead of arch code" 2015-09-15 13:18:04 -05:00
parport parport: Revert "parport: fix memory leak" 2015-07-25 12:48:05 -07:00
pci Merge branches 'pm-pci' and 'acpi-pci' 2015-10-01 22:30:12 +02:00
pcmcia pcmcia: soc_common: remove skt_dev_info's clk pointer 2015-09-03 16:01:03 +01:00
perf
phy This is the bulk of GPIO changes for the v4.3 kernel cycle: 2015-09-04 10:07:45 -07:00
pinctrl Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-09-18 08:11:42 -07:00
platform platform-drivers-x86 for 4.3-2 2015-09-17 21:41:02 -07:00
pnp cleanup IORESOURCE_CACHEABLE vs ioremap() 2015-08-10 23:07:06 -04:00
power power supply and reset fixes for the v4.3 series 2015-09-17 12:25:42 -07:00
powercap powercap / RAPL: disable the 2nd power limit properly 2015-08-29 01:46:40 +02:00
pps pps: clients: drop owner assignment from platform_drivers 2014-10-20 16:21:28 +02:00
ps3 ps3: Fix trivial typos in comment and debug message 2015-03-26 15:23:17 +11:00
ptp ptp: remove 32 bit get/set methods. 2015-03-31 12:01:19 -04:00
pwm pwm: Changes for v4.3-rc1 2015-09-09 10:55:32 -07:00
rapidio Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2015-06-23 14:08:54 -07:00
ras x86/ras: Move AMD MCE injector to arch/x86/ras/ 2015-08-13 10:12:54 +02:00
regulator Merge remote-tracking branches 'regulator/fix/anatop', 'regulator/fix/gpio', 'regulator/fix/pbias', 'regulator/fix/tpx65218' and 'regulator/fix/vexpress' into regulator-linus 2015-09-21 14:16:09 -07:00
remoteproc remoteproc: fix !CONFIG_OF build breakage 2015-06-18 11:44:41 +03:00
reset reset: ath79: Fix missing spin_lock_init 2015-09-01 14:48:40 +02:00
rpmsg virtio_rpmsg: set DRIVER_OK before using device 2015-03-13 15:55:42 +10:30
rtc rtc: abx80x: fix RTC write bit 2015-09-05 19:37:31 +02:00
s390 virtio: fixes on top of 4.3-rc1 2015-09-18 09:28:20 -07:00
sbus drivers/sbus/char/envctrl.c: ignore orderly_poweroff return value 2015-04-15 16:35:23 -07:00
scsi blk-mq: fix racy updates of rq->errors 2015-10-01 10:10:55 +02:00
sfi SFI: fix compiler warnings 2014-12-03 18:49:20 -05:00
sh SH Drivers Updates for v4.3 2015-09-21 12:02:27 -07:00
sn Drivers: misc: remove __dev* attributes. 2013-01-03 15:57:16 -08:00
soc genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
spi Merge remote-tracking branches 'spi/fix/spidev' and 'spi/fix/xtfpga' into spi-linus 2015-09-22 09:48:41 -07:00
spmi genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
ssb SSB: Fix handling of ssb_pmu_get_alp_clock() 2015-06-09 16:38:06 +02:00
staging Staging driver fixes for 4.3-rc3 2015-09-26 20:56:50 -04:00
target iscsi-target: Avoid OFMarker + IFMarker negotiation 2015-09-24 23:24:46 -07:00
tc TC: Error handling clean-ups 2014-11-24 07:45:25 +01:00
thermal thermal: avoid division by zero in power allocator 2015-10-01 21:42:35 -04:00
thunderbolt thunderbolt: Allow loading of module on recent Apple MacBooks with thunderbolt 2 controller 2015-09-20 15:20:11 -07:00
tty tty: serial: Add missing module license for 8250_base.ko 2015-09-22 09:09:15 -07:00
uio
usb USB: whiteheat: fix potential null-deref at probe 2015-09-23 12:15:19 -07:00
uwb
vfio
vhost virtio: fixes on top of 4.3-rc1 2015-09-18 09:28:20 -07:00
video Merge branch 'akpm' (patches from Andrew) 2015-09-10 18:19:42 -07:00
virt drivers: clean-up prom.h implicit includes 2013-10-09 20:04:04 -05:00
virtio virtio_balloon: do not change memory amount visible via /proc/meminfo 2015-09-08 13:32:11 +03:00
vlynq
vme vme: tsi148: depend on HAS_DMA for Kconfig 2015-06-12 17:31:05 -07:00
w1 Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2015-09-01 18:46:42 -07:00
watchdog watchdog: iTCO: Fix dependencies on I2C 2015-09-28 10:56:10 +02:00
xen Merge branch 'akpm' (patches from Andrew) 2015-09-10 18:19:42 -07:00
zorro
Kconfig Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm 2015-09-03 16:27:01 -07:00
Makefile This is the bulk of pin control changes for the v4.3 development 2015-09-04 10:22:09 -07:00