nf: IDLETIMER: Fix possible use before initialization in idletimer_resume

idletimer_resume() assumes that the PM_SUSPEND_PREPARE notifier is sent
before PM_POST_PREPARE so that timer->last_suspend_time is initialized.
However, it is posible for PM_POST_PREPARE to be sent first if there is an
error returned from another driver's PM_SUSPEND_PREPARE notifier.

Add a flag indicating whether the current value of timer->last_suspend is
valid.

Detected with CONFIG_SLUB_DEBUG & CONFIG_DEBUG_SPINLOCK in arm64. The
timestamp lock is held for more than a minute while
set_normalized_timespec() proceses the poisoned timer->last_suspend_time
argument.

Signed-off-by: Patrick Daly <pdaly@codeaurora.org>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
msm: vidc: Initialize kernel space stack variables

This change initializes kernel space stack variables
that are passed between kernel space and user space
using ioctls.
Non initialization of these variables may lead to
leakage of memory values from the kernel stack to
user space.

Signed-off-by: Deepak Verma <dverma@codeaurora.org>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
zram: avoid kunmap_atomic() of a NULL pointer

zram could kunmap_atomic() a NULL pointer in a rare situation: a zram
page becomes a full-zeroed page after a partial write io.  The current
code doesn't handle this case and performs kunmap_atomic() on a NULL
pointer, which panics the kernel.

This patch fixes this issue.

Signed-off-by: Weijie Yang <weijie.yang@samsung.com>
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Dan Streetman <ddstreet@ieee.org>
Cc: Nitin Gupta <ngupta@vflare.org>
Cc: Weijie Yang <weijie.yang.kh@gmail.com>
Acked-by: Jerome Marchand <jmarchan@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>
cpufreq: upstream fixes