AuxXxilium/linux_dsm_epyc7002
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83f45fc360
linux_dsm_epyc7002/drivers
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Daniel Vetter 83f45fc360 drm: Don't grab an fb reference for the idr 
The current refcounting scheme is that the fb lookup idr also holds a
reference. This works out nicely bacause thus far we've always
explicitly cleaned up idr entries for framebuffers:
- Userspace fbs get removed in the rmfb ioctl or when the drm file
  gets closed.
- Kernel fbs (for fbdev emulation) get cleaned up by the driver code
  at module unload time.

But now i915 also reconstructs the bios fbs for a smooth transition.
And that fb is purely transitional and should get removed immmediately
once all crtcs stop using it. Of course if the i915 fbdev code decides
to reuse it as the main fbdev fb then it shouldn't be cleaned up, but
in that case the fbdev code will grab it's own reference.

The problem is now that we also want to register that takeover fb in
the idr, so that userspace can do a smooth transition (animated maybe
even!) itself. But currently we have no one who will clean up the idr
reference once that fb isn't useful any more, and so essentially leak
it.

Fix this by no longer holding a full fb reference for the idr, but
instead just have a weak reference using kref_get_unless_zero. But
that requires us to synchronize and clean up with the idr and fb_lock
in drm_framebuffer_free, so add that. It's a bit ugly that we have to
unconditionally grab the fb_lock, but without that someone might creep
through a race.

This leak was caught by the fb leak check in drm_mode_config_cleanup.
Originally the leak was introduced in

commit 46f297fb83
Author: Jesse Barnes <jbarnes@virtuousgeek.org>
Date:   Fri Mar 7 08:57:48 2014 -0800

    drm/i915: add plane_config fetching infrastructure v2

Cc:  Jesse Barnes <jbarnes@virtuousgeek.org>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=77511
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2014-08-06 10:41:13 +02:00
..
accessibility
acpi ACPI / video: Add use_native_backlight quirk for HP ProBook 4540s 2014-07-16 14:16:30 +02:00
amba
ata libata: introduce ata_host->n_tags to avoid oops on SAS controllers 2014-07-23 10:30:34 -04:00
atm atm: fore200e.c: Cleaning up uninitialized variables 2014-06-02 17:11:03 -07:00
auxdisplay
base Linux 3.16 2014-08-05 09:04:59 +10:00
bcma
block zram: avoid lockdep splat by revalidate_disk 2014-07-23 15:10:54 -07:00
bluetooth Bluetooth: Ignore H5 non-link packets in non-active state 2014-06-23 18:22:48 +02:00
bus bus/arm-cci: add dependency on OF && CPU_V7 2014-06-17 17:09:35 +02:00
cdrom Merge branch 'for-linus' of git://git.kernel.dk/linux-block 2014-06-11 08:41:17 -07:00
char Linux 3.16 2014-08-05 09:04:59 +10:00
clk clk: ti: clk-7xx: Correct ABE DPLL configuration 2014-07-31 08:36:58 -07:00
clocksource clocksource: exynos_mct: Register the timer for stable udelay 2014-07-05 06:40:23 +09:00
connector Char / misc driver patches for 3.16-rc1 2014-06-03 08:06:56 -07:00
cpufreq cpufreq: move policy kobj to policy->cpu at resume 2014-07-17 14:23:22 +02:00
cpuidle cpuidle: mvebu: Fix the name of the states 2014-06-18 21:54:46 +02:00
crypto crypto: caam - fix memleak in caam_jr module 2014-07-10 16:59:13 +08:00
dca
devfreq
dio
dma Update imx-sdma cyclic handling to report residue 2014-07-01 12:23:42 +05:30
edac PCI changes for the v3.16 merge window: 2014-06-02 12:15:19 -07:00
eisa
extcon
firewire IEEE 1394 (FireWire) subsystem fix: MSI don't work on VIA PCIe controllers 2014-07-27 09:42:06 -07:00
firmware efi: fdt: Do not report an error during boot if UEFI is not available 2014-07-10 11:02:48 +01:00
fmc
gpio Pin control fixes for v3.16: 2014-07-23 17:42:37 -07:00
gpu drm: Don't grab an fb reference for the idr 2014-08-06 10:41:13 +02:00
hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid 2014-07-07 13:13:03 -07:00
hsi hsi: omap_ssi_port: use normal module refcounting 2014-06-05 00:59:05 +02:00
hv Drivers: hv: hv_fcopy: fix a race condition for SMP guest 2014-07-17 18:43:10 -07:00
hwmon hwmon: (smsc47m192) Fix temperature limit and vrm write operations 2014-07-24 06:25:25 -07:00
hwspinlock
i2c i2c: sun6i-p2wi: Remove duplicate inclusion of module.h 2014-06-27 14:39:36 +02:00
ide Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/ide 2014-07-21 22:44:24 -07:00
idle
iio iio:bma180: Missing check for frequency fractional part 2014-07-20 17:39:47 +01:00
infiniband Merge branches 'cxgb4' and 'mlx5' into for-next 2014-07-16 23:14:42 -07:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2014-07-23 15:42:53 -07:00
iommu iommu/fsl: Fix the error condition during iommu group 2014-07-07 10:30:02 +02:00
ipack
irqchip irqchip: gic: Fix core ID calculation when topology is read from DT 2014-07-18 13:13:41 +00:00
isdn isdn/bas_gigaset: fix a leak on failure path in gigaset_probe() 2014-07-29 12:18:34 -07:00
leds Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds 2014-06-12 13:08:09 -07:00
lguest
macintosh powerpc/macintosh/smu.c: Fix closing brace followed by if 2014-06-24 12:43:15 +10:00
mailbox
mcb mcb: Add support for shared PCI IRQs 2014-05-27 17:38:11 -07:00
md dm cache: fix race affecting dirty block count 2014-08-01 12:25:22 -04:00
media Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media 2014-07-21 11:44:34 -07:00
memory
memstick drivers/memstick/host/rtsx_pci_ms.c: add cancel_work when remove driver 2014-06-23 16:47:44 -07:00
message mptfusion: fix msgContext in mptctl_hp_hostinfo 2014-05-28 18:14:16 +02:00
mfd mfd: ab8500: Fix dt irq mapping 2014-06-26 13:34:15 +01:00
misc ARM: SoC fixes for 3.16 2014-06-25 12:19:01 -07:00
mmc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2014-06-12 14:27:40 -07:00
mtd Two UBI fastmap-related fixes for v3.16: 2014-07-18 06:23:34 -10:00
net Revert "cdc_subset: deal with a device that needs reset for timeout" 2014-07-30 08:56:23 -07:00
nfc
ntb
nubus kernel/printk: use symbolic defines for console loglevels 2014-06-04 16:54:17 -07:00
of of: Add memory limiting function for flattened devicetrees 2014-07-29 21:26:45 -06:00
oprofile
parisc
parport parport: fix menu breakage 2014-07-25 18:00:23 -07:00
pci PCI: Fix unaligned access in AF transaction pending test 2014-06-17 15:40:13 -06:00
pcmcia pcmcia: Use pci_is_bridge() to simplify code 2014-05-27 14:58:24 -06:00
phy USB fixes for 3.16-rc5 2014-07-12 14:13:10 -07:00
pinctrl pinctrl: st: Fix irqmux handler 2014-07-15 20:55:15 +02:00
platform Merge branch 'for_linus' of git://cavan.codon.org.uk/platform-drivers-x86 2014-06-10 16:58:32 -07:00
pnp ACPI / PNP: Fix acpi_pnp_match() 2014-07-30 00:23:09 +02:00
power ACPI and power management updates for 3.16-rc1 2014-06-04 08:57:16 -07:00
powercap
pps
ps3
ptp ptp: ptp_pch depends on x86_32 2014-06-17 15:43:48 -07:00
pwm pwm: Changes for v3.16-rc1 2014-06-11 14:06:55 -07:00
rapidio rapidio/tsi721_dma: fix failure to obtain transaction descriptor 2014-07-30 17:16:13 -07:00
regulator Merge remote-tracking branches 'regulator/fix/bcm590xx', 'regulator/fix/palmas' and 'regulator/fix/tps65218' into regulator-linus 2014-06-28 14:01:04 +01:00
remoteproc remoteproc: da8xx: don't select CMA on no-MMU 2014-06-17 17:09:36 +02:00
reset ARM: SoC driver changes 2014-06-02 16:35:49 -07:00
rpmsg
rtc drivers/rtc/rtc-puv3.c: remove "&dev->" for typo issue MIME-Version: 1.0 2014-06-20 08:22:39 +08:00
s390 s390/zcrypt: improve device probing for zcrypt adapter cards 2014-07-16 10:48:12 +02:00
sbus
scsi scsi: handle flush errors properly 2014-07-17 21:56:34 +02:00
sfi
sh SH Driver Update for v3.16 2014-06-06 11:44:09 -07:00
sn
soc
spi Merge remote-tracking branches 'spi/fix/pxa2xx', 'spi/fix/qup' and 'spi/fix/sh-sci' into spi-linus 2014-06-28 14:01:23 +01:00
spmi
ssb
staging Linux 3.16 2014-08-05 09:04:59 +10:00
target iscsi-target: fix iscsit_del_np deadlock on unload 2014-06-27 23:23:35 -07:00
tc TC: Handle device_register() errors. 2014-06-26 10:48:23 +01:00
thermal thermal: ti-soc-thermal: ti-bandgap.c: Cleaning up wrong address is checked 2014-07-01 09:52:35 +08:00
tty serial: imx: Fix build breakage 2014-07-11 17:43:13 -07:00
uio Revert "uio: fix vma io range check in mmap" 2014-06-17 16:07:08 -07:00
usb usb: Check if port status is equal to RxDetect 2014-07-17 17:14:01 -07:00
uwb uwb: fix variable set but not used warnings 2014-05-27 15:18:48 -07:00
vfio A handful of VFIO bug fixes for v3.16 2014-06-07 20:12:15 -07:00
vhost vhost-scsi: don't open-code kvfree 2014-06-23 09:22:48 +03:00
video fb: adv7393: add missing semicolon 2014-07-01 13:18:38 +03:00
virt
virtio
vlynq
vme
w1 w1: mxc_w1: Fix incorrect "presence" status 2014-06-19 17:51:46 -07:00
watchdog Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2014-06-21 06:47:01 -10:00
xen Fix BUG when trying to expand the grant table. This seems to occur 2014-07-30 09:00:20 -07:00
zorro
Kconfig
Makefile Char / misc driver patches for 3.16-rc1 2014-06-03 08:06:56 -07:00