slab_common: Do not check for duplicate slab names

SLUB can alias multiple slab kmem_create_requests to one slab cache to save
memory and increase the cache hotness. As a result the name of the slab can be
stale. Only check the name for duplicates if we are in debug mode where we do
not merge multiple caches.

This fixes the following problem reported by Jonathan Brassow:

  The problem with kmem_cache* is this:

  *) Assume CONFIG_SLUB is set
  1) kmem_cache_create(name="foo-a")
  - creates new kmem_cache structure
  2) kmem_cache_create(name="foo-b")
  - If identical cache characteristics, it will be merged with the previously
    created cache associated with "foo-a".  The cache's refcount will be
    incremented and an alias will be created via sysfs_slab_alias().
  3) kmem_cache_destroy(<ptr>)
  - Attempting to destroy cache associated with "foo-a", but instead the
    refcount is simply decremented.  I don't even think the sysfs aliases are
    ever removed...
  4) kmem_cache_create(name="foo-a")
  - This FAILS because kmem_cache_sanity_check colides with the existing
    name ("foo-a") associated with the non-removed cache.

  This is a problem for RAID (specifically dm-raid) because the name used
  for the kmem_cache_create is ("raid%d-%p", level, mddev).  If the cache
  persists for long enough, the memory address of an old mddev will be
  reused for a new mddev - causing an identical formulation of the cache
  name.  Even though kmem_cache_destory had long ago been used to delete
  the old cache, the merging of caches has cause the name and cache of that
  old instance to be preserved and causes a colision (and thus failure) in
  kmem_cache_create().  I see this regularly in my testing.

Reported-by: Jonathan Brassow <jbrassow@redhat.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
ARM: 7842/1: MCPM: don't explode if invoked without being initialized first

Currently mcpm_cpu_power_down() and mcpm_cpu_suspend() trigger BUG()
if mcpm_platform_register() is not called beforehand.  This may occur
for many reasons such as some incomplete device tree passed to the kernel
or the like.

Let's be nicer to users and avoid killing the kernel if that happens by
logging a warning and returning to the caller.  The mcpm_cpu_suspend()
user is already set to deal with this situation, and so is cpu_die()
invoking mcpm_cpu_die().

The problematic case would have been the B.L switcher's usage of
mcpm_cpu_power_down(), however it has to call mcpm_cpu_power_up() first
which is already set to catch an error resulting from a missing
mcpm_platform_register() call.

Signed-off-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
ARM: 7843/1: drop asm/types.h from generic-y

Commit 09096f6 (ARM: 7822/1: add workaround for ambiguous C99 stdint.h
types) introduced an ARM specific 'asm/types.h' to work around some
ambiguities in the definitions of 32 bit types. Hence, we will not be
needing the generic version anymore.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
ARM: 7845/1: sharpsl_param.c: fix invalid memory access for pxa devices

This fixes a regression for kernels after v3.2

After commit 72662e01088394577be4a3f14da94cf87bea2591
ARM: head.S: only include __turn_mmu_on in the initial identity mapping

Zaurus PXA devices call sharpsl_save_param() during fixup and hang on
boot because memcpy refers to physical addresses no longer valid if the
MMU is setup.
Zaurus collie (SA1100) is unaffected (function is called in init_machine).

The code was making assumptions and for PXA the virtual address
should have been used before.

Signed-off-by: Marko Katic <dromede@gmail.com>
Signed-off-by: Andrea Adami <andrea.adami@gmail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
ARM: 7846/1: Update SMP_ON_UP code to detect A9MPCore with 1 CPU devices

The generic code is well equipped to differentiate between
SMP and UP configurations.However, there are some devices which
use Cortex-A9 MP core IP with 1 CPU as configuration. To let
these SOCs to co-exist in a CONFIG_SMP=y build by leveraging
the SMP_ON_UP support, we need to additionally check the
number the cores in Cortex-A9 MPCore configuration. Without
such a check in place, the startup code tries to execute
ALT_SMP() set of instructions which lead to CPU faults.

The issue was spotted on TI's Aegis device and this patch
makes now the device work with omap2plus_defconfig which
enables SMP by default. The change is kept limited to only
Cortex-A9 MPCore detection code.

Note that if any future SoC *does* use 0x0 as the PERIPH_BASE, then
the SCU address check code needs to be #ifdef'd for for the Aegis
platform.

Acked-by: Sricharan R <r.sricharan@ti.com>
Signed-off-by: Vaibhav Bedia <vaibhav.bedia@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
ARM: OMAP2: gpmc-onenand: fix sync mode setup with DT

With DT-based boot, the GPMC OneNAND sync mode setup does not work
correctly. During the async mode setup, sync flags gets incorrectly
set in the onenand_async data and the system crashes during the async
setup. Also, the sync mode never gets set in gpmc_onenand_data->flags, so
even without the crash, the actual sync mode setup would never be called.

The patch fixes this by adjusting the gpmc_onenand_data->flags when the
data is read from the DT. Also while doing this we force the onenand_async
to be always async.

The patch enables to use the following DTS chunk (that should correspond
the arch/arm/mach-omap2/board-rm680.c board file setup) with Nokia N950,
which currently crashes with 3.12-rc1. The crash output can be also
found below.

&gpmc {
	ranges = <0 0 0x04000000 0x20000000>;

	onenand@0,0 {
		#address-cells = <1>;
		#size-cells = <1>;
		reg = <0 0 0x20000000>;

		gpmc,sync-read;
		gpmc,sync-write;
		gpmc,burst-length = <16>;
		gpmc,burst-read;
		gpmc,burst-wrap;
		gpmc,burst-write;
		gpmc,device-width = <2>;
		gpmc,mux-add-data = <2>;
		gpmc,cs-on-ns = <0>;
		gpmc,cs-rd-off-ns = <87>;
		gpmc,cs-wr-off-ns = <87>;
		gpmc,adv-on-ns = <0>;
		gpmc,adv-rd-off-ns = <10>;
		gpmc,adv-wr-off-ns = <10>;
		gpmc,oe-on-ns = <15>;
		gpmc,oe-off-ns = <87>;
		gpmc,we-on-ns = <0>;
		gpmc,we-off-ns = <87>;
		gpmc,rd-cycle-ns = <112>;
		gpmc,wr-cycle-ns = <112>;
		gpmc,access-ns = <81>;
		gpmc,page-burst-access-ns = <15>;
		gpmc,bus-turnaround-ns = <0>;
		gpmc,cycle2cycle-delay-ns = <0>;
		gpmc,wait-monitoring-ns = <0>;
		gpmc,clk-activation-ns = <5>;
		gpmc,wr-data-mux-bus-ns = <30>;
		gpmc,wr-access-ns = <81>;
		gpmc,sync-clk-ps = <15000>;
	};
};

[    1.467559] GPMC CS0: cs_on     :   0 ticks,   0 ns (was   0 ticks)   0 ns
[    1.474822] GPMC CS0: cs_rd_off :   1 ticks,   5 ns (was  24 ticks)   5 ns
[    1.482116] GPMC CS0: cs_wr_off :  14 ticks,  71 ns (was  24 ticks)  71 ns
[    1.489349] GPMC CS0: adv_on    :   0 ticks,   0 ns (was   0 ticks)   0 ns
[    1.496582] GPMC CS0: adv_rd_off:   3 ticks,  15 ns (was   3 ticks)  15 ns
[    1.503845] GPMC CS0: adv_wr_off:   3 ticks,  15 ns (was   3 ticks)  15 ns
[    1.511077] GPMC CS0: oe_on     :   3 ticks,  15 ns (was   4 ticks)  15 ns
[    1.518310] GPMC CS0: oe_off    :   1 ticks,   5 ns (was  24 ticks)   5 ns
[    1.525543] GPMC CS0: we_on     :   0 ticks,   0 ns (was   0 ticks)   0 ns
[    1.532806] GPMC CS0: we_off    :   8 ticks,  40 ns (was  24 ticks)  40 ns
[    1.540039] GPMC CS0: rd_cycle  :   4 ticks,  20 ns (was  29 ticks)  20 ns
[    1.547302] GPMC CS0: wr_cycle  :   4 ticks,  20 ns (was  29 ticks)  20 ns
[    1.554504] GPMC CS0: access    :   0 ticks,   0 ns (was  23 ticks)   0 ns
[    1.561767] GPMC CS0: page_burst_access:   0 ticks,   0 ns (was   3 ticks)   0 ns
[    1.569641] GPMC CS0: bus_turnaround:   0 ticks,   0 ns (was   0 ticks)   0 ns
[    1.577270] GPMC CS0: cycle2cycle_delay:   0 ticks,   0 ns (was   0 ticks)   0 ns
[    1.585144] GPMC CS0: wait_monitoring:   0 ticks,   0 ns (was   0 ticks)   0 ns
[    1.592834] GPMC CS0: clk_activation:   0 ticks,   0 ns (was   0 ticks)   0 ns
[    1.600463] GPMC CS0: wr_data_mux_bus:   5 ticks,  25 ns (was   8 ticks)  25 ns
[    1.608154] GPMC CS0: wr_access :   0 ticks,   0 ns (was  23 ticks)   0 ns
[    1.615386] GPMC CS0 CLK period is 5 ns (div 1)
[    1.625122] Unhandled fault: external abort on non-linefetch (0x1008) at 0xf009e442
[    1.633178] Internal error: : 1008 [#1] ARM
[    1.637573] Modules linked in:
[    1.640777] CPU: 0 PID: 1 Comm: swapper Not tainted 3.12.0-rc1-n9xx-los.git-5318619-00006-g4baa700-dirty #26
[    1.651123] task: ef04c000 ti: ef050000 task.ti: ef050000
[    1.656799] PC is at gpmc_onenand_setup+0x98/0x1e0
[    1.661865] LR is at gpmc_cs_set_timings+0x494/0x5a4
[    1.667083] pc : [<c002e040>]    lr : [<c001f384>]    psr: 60000113
[    1.667083] sp : ef051d10  ip : ef051ce0  fp : ef051d94
[    1.679138] r10: c0caaf60  r9 : ef050000  r8 : ef18b32c
[    1.684631] r7 : f0080000  r6 : c0caaf60  r5 : 00000000  r4 : f009e400
[    1.691497] r3 : f009e442  r2 : 80050000  r1 : 00000014  r0 : 00000000
[    1.698333] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment kernel
[    1.706024] Control: 10c5387d  Table: af290019  DAC: 00000015
[    1.712066] Process swapper (pid: 1, stack limit = 0xef050240)
[    1.718200] Stack: (0xef051d10 to 0xef052000)
[    1.722778] 1d00:                                     00004000 00001402 00000000 00000005
[    1.731384] 1d20: 00000047 00000000 0000000f 0000000f 00000000 00000028 0000000f 00000005
[    1.739990] 1d40: 00000000 00000000 00000014 00000014 00000000 00000000 00000000 00000000
[    1.748596] 1d60: 00000000 00000019 00000000 00000000 ef18b000 ef099c50 c0c8cb30 00000000
[    1.757171] 1d80: c0488074 c048f868 ef051dcc ef051d98 c024447c c002dfb4 00000000 c048f868
[    1.765777] 1da0: 00000000 00000000 c010e4a4 c0dbbb7c c0c8cb40 00000000 c0ca2500 c0488074
[    1.774383] 1dc0: ef051ddc ef051dd0 c01fd508 c0244370 ef051dfc ef051de0 c01fc204 c01fd4f4
[    1.782989] 1de0: c0c8cb40 c0ca2500 c0c8cb74 00000000 ef051e1c ef051e00 c01fc3b0 c01fc104
[    1.791595] 1e00: ef0983bc 00000000 c0ca2500 c01fc31c ef051e44 ef051e20 c01fa794 c01fc328
[    1.800201] 1e20: ef03634c ef0983b0 ef27d534 c0ca2500 ef27d500 c0c9a2f8 ef051e54 ef051e48
[    1.808807] 1e40: c01fbcfc c01fa744 ef051e84 ef051e58 c01fb838 c01fbce4 c0411df8 c0caa040
[    1.817413] 1e60: ef051e84 c0ca2500 00000006 c0caa040 00000066 c0488074 ef051e9c ef051e88
[    1.825988] 1e80: c01fca30 c01fb768 c04975b8 00000006 ef051eac ef051ea0 c01fd728 c01fc9bc
[    1.834594] 1ea0: ef051ebc ef051eb0 c048808c c01fd6e4 ef051f4c ef051ec0 c0008888 c0488080
[    1.843200] 1ec0: 0000006f c046bae8 00000000 00000000 ef051efc ef051ee0 ef051f04 ef051ee8
[    1.851806] 1ee0: c046d400 c0181218 c046d410 c18da8d5 c036a8e4 00000066 ef051f4c ef051f08
[    1.860412] 1f00: c004b9a8 c046d41c c048f840 00000006 00000006 c046b488 00000000 c043ec08
[    1.869018] 1f20: ef051f4c c04975b8 00000006 c0caa040 00000066 c046d410 c048f85c c048f868
[    1.877593] 1f40: ef051f94 ef051f50 c046db8c c00087a0 00000006 00000006 c046d410 ffffffff
[    1.886199] 1f60: ffffffff ffffffff ffffffff 00000000 c0348fd0 00000000 00000000 00000000
[    1.894805] 1f80: 00000000 00000000 ef051fac ef051f98 c0348fe0 c046daa8 00000000 00000000
[    1.903411] 1fa0: 00000000 ef051fb0 c000e7f8 c0348fdc 00000000 00000000 00000000 00000000
[    1.912017] 1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[    1.920623] 1fe0: 00000000 00000000 00000000 00000000 00000013 00000000 ffffffff ffffffff
[    1.929199] Backtrace:
[    1.931793] [<c002dfa8>] (gpmc_onenand_setup+0x0/0x1e0) from [<c024447c>] (omap2_onenand_probe+0x118/0x49c)
[    1.942047] [<c0244364>] (omap2_onenand_probe+0x0/0x49c) from [<c01fd508>] (platform_drv_probe+0x20/0x24)
[    1.952117]  r8:c0488074 r7:c0ca2500 r6:00000000 r5:c0c8cb40 r4:c0dbbb7c
[    1.959197] [<c01fd4e8>] (platform_drv_probe+0x0/0x24) from [<c01fc204>] (driver_probe_device+0x10c/0x224)
[    1.969360] [<c01fc0f8>] (driver_probe_device+0x0/0x224) from [<c01fc3b0>] (__driver_attach+0x94/0x98)
[    1.979125]  r7:00000000 r6:c0c8cb74 r5:c0ca2500 r4:c0c8cb40
[    1.985107] [<c01fc31c>] (__driver_attach+0x0/0x98) from [<c01fa794>] (bus_for_each_dev+0x5c/0x90)
[    1.994506]  r6:c01fc31c r5:c0ca2500 r4:00000000 r3:ef0983bc
[    2.000488] [<c01fa738>] (bus_for_each_dev+0x0/0x90) from [<c01fbcfc>] (driver_attach+0x24/0x28)
[    2.009735]  r6:c0c9a2f8 r5:ef27d500 r4:c0ca2500
[    2.014587] [<c01fbcd8>] (driver_attach+0x0/0x28) from [<c01fb838>] (bus_add_driver+0xdc/0x260)
[    2.023742] [<c01fb75c>] (bus_add_driver+0x0/0x260) from [<c01fca30>] (driver_register+0x80/0xfc)
[    2.033081]  r8:c0488074 r7:00000066 r6:c0caa040 r5:00000006 r4:c0ca2500
[    2.040161] [<c01fc9b0>] (driver_register+0x0/0xfc) from [<c01fd728>] (__platform_driver_register+0x50/0x64)
[    2.050476]  r5:00000006 r4:c04975b8
[    2.054260] [<c01fd6d8>] (__platform_driver_register+0x0/0x64) from [<c048808c>] (omap2_onenand_driver_init+0x18/0x20)
[    2.065490] [<c0488074>] (omap2_onenand_driver_init+0x0/0x20) from [<c0008888>] (do_one_initcall+0xf4/0x150)
[    2.075836] [<c0008794>] (do_one_initcall+0x0/0x150) from [<c046db8c>] (kernel_init_freeable+0xf0/0x1b4)
[    2.085815] [<c046da9c>] (kernel_init_freeable+0x0/0x1b4) from [<c0348fe0>] (kernel_init+0x10/0xec)
[    2.095336] [<c0348fd0>] (kernel_init+0x0/0xec) from [<c000e7f8>] (ret_from_fork+0x14/0x3c)
[    2.104125]  r4:00000000 r3:00000000
[    2.107879] Code: ebffc3ae e2505000 ba00002e e2843042 (e1d320b0)
[    2.114318] ---[ end trace b8ee3e3e5e002451 ]---

Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Tony Lindgren <tony@atomide.com>
ARM: OMAP3: Fix hardware detection for omap3630 when booted with device tree

SoC family definitions at the moment are reactive to board needs
as a result, beagle-xm would matchup with ti,omap3 which invokes
omap3430_init_early instead of omap3630_init_early. Obviously, this is
the wrong behavior.

With clock node dts conversion, we get the following warnings before
system hangs as a result and 3630 based platforms fails to boot
(uart4 clocks are only present in OMAP3630 and not present in
OMAP3430):

...
omap_hwmod: uart4: cannot clk_get main_clk uart4_fck
omap_hwmod: uart4: cannot _init_clocks

WARNING: CPU: 0 PID: 1 at arch/arm/mach-omap2/omap_hwmod.c:2434
_init+0x6c/0x80()
omap_hwmod: uart4: couldn't init clocks
...

WARNING: CPU: 0 PID: 1 at arch/arm/mach-omap2/omap_hwmod.c:2126
_enable+0x254/0x280()
omap_hwmod: timer12: enabled state can only be entered from
initialized, idle, or disabled state
...

WARNING: CPU: 0 PID: 46 at arch/arm/mach-omap2/omap_hwmod.c:2224
_idle+0xd4/0xf8()
omap_hwmod: timer12: idle state can only be entered from enabled state

WARNING: CPU: 0 PID: 1 at arch/arm/mach-omap2/omap_hwmod.c:2126
_enable+0x254/0x280()
omap_hwmod: uart4: enabled state can only be entered from
initialized, idle, or disabled state

So, add specific compatiblity for 3630 to allow match for Beagle-XM
platform.

Signed-off-by: Nishanth Menon <nm@ti.com>
[tony@atomide.com: left out ti,omap343x, updated comments]
Signed-off-by: Tony Lindgren <tony@atomide.com>
ARM: dts: Fix pinctrl mask for omap3

The wake-up interrupt bit is available on omap3/4/5 processors
unlike what we claim. Without fixing it we cannot use it on
omap3 and the system configured for wake-up events will just
hang on wake-up.

Cc: Grygorii Strashko <grygorii.strashko@ti.com>
Cc: Benoît Cousson <bcousson@baylibre.com>
Cc: devicetree@vger.kernel.org
Signed-off-by: Tony Lindgren <tony@atomide.com>
ARM: mach-omap2: board-generic: fix undefined symbol

Since dra7 reuses the  function 'omap5_realtime_timer_init' in
arch/arm/mach-omap2/board-generic.c as timer init function, it has to be
built for this SoC as well.

Signed-off-by: Simon Barth <Simon.Pe.Barth@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
ARM: OMAP2: RX-51: Add missing max_current to rx51_lp5523_led_config

File drivers/leds/leds-lp55xx-common.c refuse to change led_current sysfs
attribute if value is higher than max_current specified in board file. By default
global C variables are zero, so changing always failed. This patch adding missing
max_current and setting it to max safe value 100 (10 mA).

It is unclear which commit exactly caused this regression as the lp5523
driver was broken and was hiding the platform data breakage. Now
the driver is fixed so this should be fixed as well.

Signed-off-by: Pali Rohár <pali.rohar@gmail.com>
Signed-off-by: Joerg Reisenweber <joerg@openmoko.org>
[tony@atomide.com: updated comments to describe regression]
Signed-off-by: Tony Lindgren <tony@atomide.com>
MAINTAINERS / Documentation: Update Rafael's e-mail address

The e-mail address rjw@sisk.pl that I have been using for quite some
time is going to expire at one point, so replace it with a new one,
rjw@rjwysocki.net, everywhere in MAINTAINERS and Documentation/ABI.

Signed-off-by: Rafael J. Wysocki <rjw@rjwysocki.net>
MAINTAINERS / ACPI: Update links and git tree information

Update the ACPI subsystem's git tree and Web links in the
MAINTAINERS file.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
rcar-hpbdma: remove shdma_free_irq() calls

Commit c1c63a14f4f2419d093acd7164eccdff315baa86 (DMA: shdma: switch to managed
resource allocation) got rid of shdma_free_irq() but  unfortunately got merged
later than commit c4f6c41ba790bbbfcebb4c47a709ac8ff1fe1af9 (dma: add driver for
R-Car HPB-DMAC), so that the HPB-DMAC driver retained the calls and got broken:

drivers/dma/sh/rcar-hpbdma.c: In function `hpb_dmae_alloc_chan_resources':
drivers/dma/sh/rcar-hpbdma.c:435: error: implicit declaration of function
`shdma_free_irq'

Fix this compilation error by removing the remaining shdma_free_irq() calls.

Reported-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Tested-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
rcar-hpbdma: add parameter to set_slave() method

Commit 4981c4dc194efb18f0e9a02f1b43e926f2f0d2bb (DMA: shdma: switch DT mode to
use configuration data from a match table) added a new parameter to set_slave()
method but unfortunately got merged later than commit c4f6c41ba790bbbfcebb4c47a
(dma: add driver for R-Car HPB-DMAC), so that the HPB-DMAC driver retained the
old prototype which caused this warning:

drivers/dma/sh/rcar-hpbdma.c:485: warning: initialization from incompatible
pointer type

The newly added parameter  is used to override DMA slave address from 'struct
hpb_dmae_slave_config', so we have to add the 'slave_addr' field to 'struct
hpb_dmae_chan', conditionally assign it in set_slave() method, and return in
slave_addr() method.

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Tested-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
dma: edma.c: remove edma_desc leakage

Free memory allocated to edma_desc when failing to allocate slot.

Signed-off-by: Geyslan G. Bem <geyslan@gmail.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
MAINTAINERS / ACPI: Update links to the Linux-ACPI project web page

The Linux-ACPI project web page is now hosted by 01.org, so update
MAINTAINERS to reflect that.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
ACPI / PM / Documentation: Replace outdated project links and addresses

Some links to projects web pages and e-mail addresses in ACPI/PM
documentation and Kconfig are outdated, so update them.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
ACPI / hotplug / PCI: Fix error code path in acpiphp_enumerate_slots()

One of the error code paths in acpiphp_enumerate_slots() is missing
a pci_dev_put(bridge->pci_dev) call, so add it.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
ACPI / hotplug / PCI: Drop WARN_ON() from acpiphp_enumerate_slots()

The WARN_ON() in acpiphp_enumerate_slots() triggers unnecessarily for
devices whose bridges are going to be handled by native PCIe hotplug
(pciehp) and the simplest way to prevent that from happening is to
drop the WARN_ON().

References: https://bugzilla.kernel.org/show_bug.cgi?id=62831
Reported-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Merge branch 'acpi-pci-hotplug'

* acpi-pci-hotplug:
  ACPI / hotplug / PCI: Drop WARN_ON() from acpiphp_enumerate_slots()
  ACPI / hotplug / PCI: Fix error code path in acpiphp_enumerate_slots()