linux-stable.git/include, branch v4.7.5

asm-generic: make copy_from_user() zero the destination properly

2016-09-24T08:09:40+00:00

commit 2545e5da080b4839dd859e3b09343a884f6ab0e3 upstream.

... in all cases, including the failing access_ok()

Note that some architectures using asm-generic/uaccess.h have
__copy_from_user() not zeroing the tail on failure halfway
through.  This variant works either way.

Signed-off-by: Al Viro 
Signed-off-by: Greg Kroah-Hartman

asm-generic: make get_user() clear the destination on errors

2016-09-24T08:09:39+00:00

commit 9ad18b75c2f6e4a78ce204e79f37781f8815c0fa upstream.

both for access_ok() failures and for faults halfway through

Signed-off-by: Al Viro 
Signed-off-by: Greg Kroah-Hartman

fix iov_iter_fault_in_readable()

2016-09-24T08:09:38+00:00

commit d4690f1e1cdabb4d61207b6787b1605a0dc0aeab upstream.

... by turning it into what used to be multipages counterpart

Signed-off-by: Al Viro 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

genirq: Provide irq_gc_{lock_irqsave,unlock_irqrestore}() helpers

2016-09-24T08:09:38+00:00

commit ebf9ff753c041b296241990aef76163bbb2cc9c8 upstream.

Some irqchip drivers need to take the generic chip lock outside of the
irq context.

Provide the irq_gc_{lock_irqsave,unlock_irqrestore}() helpers to allow
one to disable irqs while entering a critical section protected by
gc->lock.

Note that we do not provide optimized version of these helpers for !SMP,
because they are not called from the hot-path.

[ tglx: Added a comment when these helpers should be [not] used ]

Signed-off-by: Boris Brezillon 
Cc: Jason Cooper 
Cc: Marc Zyngier 
Cc: Nicolas Ferre 
Cc: Alexandre Belloni 
Link: http://lkml.kernel.org/r/1473775109-4192-1-git-send-email-boris.brezillon@free-electrons.com
Signed-off-by: Thomas Gleixner 
Signed-off-by: Greg Kroah-Hartman

efi/libstub: Introduce ExitBootServices helper

2016-09-24T08:09:37+00:00

commit fc07716ba803483be91bc4b2344f9c84985e6f07 upstream.

The spec allows ExitBootServices to fail with EFI_INVALID_PARAMETER if a
race condition has occurred where the EFI has updated the memory map after
the stub grabbed a reference to the map.  The spec defines a retry
proceedure with specific requirements to handle this scenario.

This scenario was previously observed on x86 - commit d3768d885c6c ("x86,
efi: retry ExitBootServices() on failure") but the current fix is not spec
compliant and the scenario is now observed on the Qualcomm Technologies
QDF2432 via the FDT stub which does not handle the error and thus causes
boot failures.  The user will notice the boot failure as the kernel is not
executed and the system may drop back to a UEFI shell, but will be
unresponsive to input and the system will require a power cycle to recover.

Add a helper to the stub library that correctly adheres to the spec in the
case of EFI_INVALID_PARAMETER from ExitBootServices and can be universally
used across all stub implementations.

Signed-off-by: Jeffrey Hugo 
Cc: Ard Biesheuvel 
Cc: Mark Rutland 
Cc: Leif Lindholm 
Cc: Ingo Molnar 
Signed-off-by: Matt Fleming 
Signed-off-by: Greg Kroah-Hartman

efi/libstub: Allocate headspace in efi_get_memory_map()

2016-09-24T08:09:36+00:00

commit dadb57abc37499f565b23933dbf49b435c3ba8af upstream.

efi_get_memory_map() allocates a buffer to store the memory map that it
retrieves.  This buffer may need to be reused by the client after
ExitBootServices() is called, at which point allocations are not longer
permitted.  To support this usecase, provide the allocated buffer size back
to the client, and allocate some additional headroom to account for any
reasonable growth in the map that is likely to happen between the call to
efi_get_memory_map() and the client reusing the buffer.

Signed-off-by: Jeffrey Hugo 
Cc: Ard Biesheuvel 
Cc: Mark Rutland 
Cc: Leif Lindholm 
Cc: Ingo Molnar 
Signed-off-by: Matt Fleming 
Signed-off-by: Greg Kroah-Hartman

efi: Make for_each_efi_memory_desc_in_map() cope with running on Xen

2016-09-24T08:09:36+00:00

commit d4c4fed08f31f3746000c46cb1b20bed2959547a upstream.

While commit 55f1ea15216 ("efi: Fix for_each_efi_memory_desc_in_map()
for empty memmaps") made an attempt to deal with empty memory maps, it
didn't address the case where the map field never gets set, as is
apparently the case when running under Xen.

Reported-by: 
Tested-by: 
Cc: Vitaly Kuznetsov 
Cc: Jiri Slaby 
Cc: Mark Rutland 
Signed-off-by: Jan Beulich 
[ Guard the loop with a NULL check instead of pointer underflow ]
Signed-off-by: Matt Fleming 
Signed-off-by: Greg Kroah-Hartman

iio: adc: ti_am335x_adc: Increase timeout value waiting for ADC sample

2016-09-24T08:09:30+00:00

commit 7175cce1c3f1d8c8840d2004f78f96a3904249b5 upstream.

Now that open delay and sample delay for each channel is configurable
via DT, the default IDLE_TIMEOUT value is not enough as this is
calculated based on hardcoded macros. This results in driver returning
EBUSY sometimes. Fix this by increasing the timeout
value based on maximum value possible to open delay and sample delays
for each channel.

Fixes: 5dc11e810676e ("iio: adc: ti_am335x_adc: make sample delay, open delay, averaging DT parameters")
Signed-off-by: Vignesh R 
Acked-by: Lee Jones 
Signed-off-by: Jonathan Cameron 
Signed-off-by: Greg Kroah-Hartman

iio: sw-trigger: Fix config group initialization

2016-09-24T08:09:29+00:00

commit b2f0c09664b72b2f8c581383a9337ac3092e42c8 upstream.

Use the IS_ENABLED() helper macro to ensure that the configfs group is
initialized either when configfs is built-in or when configfs is built as a
module. Otherwise software trigger creation will result in undefined
behaviour when configfs is built as a mdoule since the configfs group for
the trigger is not properly initialized.

Fixes: b662f809d410 ("iio: core: Introduce IIO software triggers")
Signed-off-by: Lars-Peter Clausen 
Acked-by: Daniel Baluta 
Signed-off-by: Jonathan Cameron 
Signed-off-by: Greg Kroah-Hartman

mm: introduce get_task_exe_file

2016-09-24T08:09:28+00:00

commit cd81a9170e69e018bbaba547c1fd85a585f5697a upstream.

For more convenient access if one has a pointer to the task.

As a minor nit take advantage of the fact that only task lock + rcu are
needed to safely grab ->exe_file. This saves mm refcount dance.

Use the helper in proc_exe_link.

Signed-off-by: Mateusz Guzik 
Acked-by: Konstantin Khlebnikov 
Acked-by: Richard Guy Briggs 
Signed-off-by: Paul Moore 
Signed-off-by: Greg Kroah-Hartman