Better document a note on this header.

While here, better format dvb_ringbuffer_pkt_read_user()
to adjust it to CodingStyle.
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>

Fix all remaining media warnings with ReST that are fixable
without changing at the Sphinx code.
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>

The conversion from DocBook required some fixes:

- Now, the C files with the exported symbols also need to be
  added. So, all headers need to be included twice: one to
  get the structs/enums/.. and another one for the functions;

- Notes should use the ReST tag, as kernel-doc doesn't
  recognizes it anymore;

- Identation needs to be fixed, as ReST uses it to identify
  when a format "tag" ends.

- Fix the cross-references at the media controller description.
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>

Move the contents of the media section at
DocBooks/DocBook/device-drivers.tmpl to a new ReST book.

For now, the contents is kept as-is. Next patches will fix
the warnings and add cross-references that were removed due to
the conversion.
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>

Don't free the object until the file handle has been closed.  Fixes
use-after-free bug which occurs when I disconnect my DVB-S received
while VDR is running.

This is a crash dump of such a use-after-free:

    general protection fault: 0000 [#1] SMP
    CPU: 0 PID: 2541 Comm: CI adapter on d Not tainted 4.7.0-rc1-hosting+ #49
    Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
    task: ffff880027d7ce00 ti: ffff88003d8f8000 task.ti: ffff88003d8f8000
    RIP: 0010:[<ffffffff812f3d1f>]  [<ffffffff812f3d1f>] dvb_ca_en50221_io_read_condition.isra.7+0x6f/0x150
    RSP: 0018:ffff88003d8fba98  EFLAGS: 00010206
    RAX: 0000000059534255 RBX: 000000753d470f90 RCX: ffff88003c74d181
    RDX: 00000001bea04ba9 RSI: ffff88003d8fbaf4 RDI: 3a3030a56d763fc0
    RBP: ffff88003d8fbae0 R08: ffff88003c74d180 R09: 0000000000000000
    R10: 0000000000000001 R11: 0000000000000000 R12: ffff88003c480e00
    R13: 00000000ffffffff R14: 0000000059534255 R15: 0000000000000000
    FS:  00007fb4209b4700(0000) GS:ffff88003fc00000(0000) knlGS:0000000000000000
    CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 00007f06445f4078 CR3: 000000003c55b000 CR4: 00000000000006b0
    Stack:
     ffff88003d8fbaf4 000000003c2170c0 0000000000004000 0000000000000000
     ffff88003c480e00 ffff88003d8fbc80 ffff88003c74d180 ffff88003d8fbb8c
     0000000000000000 ffff88003d8fbb10 ffffffff812f3e37 ffff88003d8fbb00
    Call Trace:
     [<ffffffff812f3e37>] dvb_ca_en50221_io_poll+0x37/0xa0
     [<ffffffff8113109b>] do_sys_poll+0x2db/0x520

This is a backtrace of the kernel attempting to lock a freed mutex:

    #0  0xffffffff81083d40 in rep_nop () at ./arch/x86/include/asm/processor.h:569
    #1  cpu_relax () at ./arch/x86/include/asm/processor.h:574
    #2  virt_spin_lock (lock=<optimized out>) at ./arch/x86/include/asm/qspinlock.h:57
    #3  native_queued_spin_lock_slowpath (lock=0xffff88003c480e90, val=761492029) at kernel/locking/qspinlock.c:304
    #4  0xffffffff810d1a06 in pv_queued_spin_lock_slowpath (val=<optimized out>, lock=<optimized out>) at ./arch/x86/include/asm/paravirt.h:669
    #5  queued_spin_lock_slowpath (val=<optimized out>, lock=<optimized out>) at ./arch/x86/include/asm/qspinlock.h:28
    #6  queued_spin_lock (lock=<optimized out>) at include/asm-generic/qspinlock.h:107
    #7  __mutex_lock_common (use_ww_ctx=<optimized out>, ww_ctx=<optimized out>, ip=<optimized out>, nest_lock=<optimized out>, subclass=<optimized out>,
        state=<optimized out>, lock=<optimized out>) at kernel/locking/mutex.c:526
    #8  mutex_lock_interruptible_nested (lock=0xffff88003c480e88, subclass=<optimized out>) at kernel/locking/mutex.c:647
    #9  0xffffffff812f49fe in dvb_ca_en50221_io_do_ioctl (file=<optimized out>, cmd=761492029, parg=0x1 <irq_stack_union+1>)
        at drivers/media/dvb-core/dvb_ca_en50221.c:1210
    #10 0xffffffff812ee660 in dvb_usercopy (file=<optimized out>, cmd=761492029, arg=<optimized out>, func=<optimized out>) at drivers/media/dvb-core/dvbdev.c:883
    #11 0xffffffff812f3410 in dvb_ca_en50221_io_ioctl (file=<optimized out>, cmd=<optimized out>, arg=<optimized out>) at drivers/media/dvb-core/dvb_ca_en50221.c:1284
    #12 0xffffffff8112eddd in vfs_ioctl (arg=<optimized out>, cmd=<optimized out>, filp=<optimized out>) at fs/ioctl.c:43
    #13 do_vfs_ioctl (filp=0xffff88003c480e90, fd=<optimized out>, cmd=<optimized out>, arg=<optimized out>) at fs/ioctl.c:674
    #14 0xffffffff8112f30c in SYSC_ioctl (arg=<optimized out>, cmd=<optimized out>, fd=<optimized out>) at fs/ioctl.c:689
    #15 SyS_ioctl (fd=6, cmd=2148298626, arg=140734533693696) at fs/ioctl.c:680
    #16 0xffffffff8103feb2 in entry_SYSCALL_64 () at arch/x86/entry/entry_64.S:207
Signed-off-by: NMax Kellermann <max@duempel.org>
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>

The wait_event() call in dvb_unregister_frontend() waits synchronously
for other tasks to free a file descriptor, but it does that while
holding several mutexes.  That alone is a bad idea, but if one user
process happens to keep a (defunct) file descriptor open indefinitely,
the kernel will correctly detect a hung task:

    INFO: task kworker/0:1:314 blocked for more than 30 seconds.
          Not tainted 4.7.0-rc1-hosting+ #50
    "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
    kworker/0:1     D ffff88003daf7a50     0   314      2 0x00000000
    Workqueue: usb_hub_wq hub_event
     ffff88003daf7a50 0000000000000296 ffff88003daf7a30 ffff88003fc13f98
     ffff88003dadce00 ffff88003daf8000 ffff88003e3fc010 ffff88003d48d4f8
     ffff88003e3b5030 ffff88003e3f8898 ffff88003daf7a68 ffffffff810cf860
    Call Trace:
     [<ffffffff810cf860>] schedule+0x30/0x80
     [<ffffffff812f88d3>] dvb_unregister_frontend+0x93/0xc0
     [<ffffffff8107a000>] ? __wake_up_common+0x80/0x80
     [<ffffffff813019c7>] dvb_usb_adapter_frontend_exit+0x37/0x70
     [<ffffffff81300614>] dvb_usb_exit+0x34/0xb0
     [<ffffffff81300d4a>] dvb_usb_device_exit+0x3a/0x50
     [<ffffffff81302dc2>] pctv452e_usb_disconnect+0x52/0x60
     [<ffffffff81295a07>] usb_unbind_interface+0x67/0x1e0
     [<ffffffff810609f3>] ? __blocking_notifier_call_chain+0x53/0x70
     [<ffffffff8127ba67>] __device_release_driver+0x77/0x110
     [<ffffffff8127c2d3>] device_release_driver+0x23/0x30
     [<ffffffff8127ab5d>] bus_remove_device+0x10d/0x150
     [<ffffffff8127879b>] device_del+0x13b/0x260
     [<ffffffff81299dea>] ? usb_remove_ep_devs+0x1a/0x30
     [<ffffffff8129468e>] usb_disable_device+0x9e/0x1e0
     [<ffffffff8128bb09>] usb_disconnect+0x89/0x260
     [<ffffffff8128db8d>] hub_event+0x30d/0xfc0
     [<ffffffff81059475>] process_one_work+0x1c5/0x4a0
     [<ffffffff8105940c>] ? process_one_work+0x15c/0x4a0
     [<ffffffff81059799>] worker_thread+0x49/0x480
     [<ffffffff81059750>] ? process_one_work+0x4a0/0x4a0
     [<ffffffff81059750>] ? process_one_work+0x4a0/0x4a0
     [<ffffffff8105f65e>] kthread+0xee/0x110
     [<ffffffff810400bf>] ret_from_fork+0x1f/0x40
     [<ffffffff8105f570>] ? __kthread_unpark+0x70/0x70
    5 locks held by kworker/0:1/314:
     #0:  ("usb_hub_wq"){......}, at: [<ffffffff8105940c>] process_one_work+0x15c/0x4a0
     #1:  ((&hub->events)){......}, at: [<ffffffff8105940c>] process_one_work+0x15c/0x4a0
     #2:  (&dev->mutex){......}, at: [<ffffffff8128d8cb>] hub_event+0x4b/0xfc0
     #3:  (&dev->mutex){......}, at: [<ffffffff8128bad2>] usb_disconnect+0x52/0x260
     #4:  (&dev->mutex){......}, at: [<ffffffff8127c2cb>] device_release_driver+0x1b/0x30

This patch removes the blocking wait, and postpones the kfree() call
until all file handles have been closed by using struct kref.
Signed-off-by: NMax Kellermann <max@duempel.org>
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>

Implement memory barriers according to Documentation/circular-buffers.txt:
- use smp_store_release() to update ringbuffer read/write pointers
- use smp_load_acquire() to load write pointer on reader side
- use ACCESS_ONCE() to load read pointer on writer side

This fixes data stream corruptions observed e.g. on an ARM Cortex-A9
quad core system with different types (PCI, USB) of DVB tuners.
Signed-off-by: NSoeren Moch <smoch@web.de>
Cc: stable@vger.kernel.org # 3.14+
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>

The dvb demuxer code uses a 'struct timespec' to pass a timeout
as absolute time. This will cause problems on 32-bit architectures
in 2038 when time_t overflows, and it is racy with a concurrent
settimeofday() call.

This patch changes the code to use ktime_get() instead, using
the monotonic time base to avoid both the race and the overflow.
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>

Prepare for postponing the call until all file handles have been
closed.

[mchehab@osg.samsung.com: make checkpatch happy]
Signed-off-by: NMax Kellermann <max@duempel.org>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

Instead of always return -ENOMEM, return the real error that should
come from media_create_pad_link().
Signed-off-by: NMax Kellermann <max@duempel.org>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

Another version of Elgato EyeTV Sat USB DVB-S2 adapter needs just
a USB ID addition.
Signed-off-by: NChristian Knippel <namerp@gmail.com>
Reported-by: NOlli Salonen <olli.salonen@iki.fi>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

Right now, dw2102 assumes that the USB IDs will be either at
an external header or defined internally. That doesn't sound
right.

So, let's move the definitions to just one place.
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

The test for the return code was mistakenly inverted. This caused DVB
devices with CA module to fail on modprobe.

Tested with TechnoTrend CT2-4650 CI USB tuner.
Signed-off-by: NOlli Salonen <olli.salonen@iki.fi>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

Signed-off-by: NPhilippe Valembois <lephilousophe@users.sourceforge.net>
Reviewed-by: NAntti Palosaari <crope@iki.fi>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

Change dvb frontend to check if tuner is free when device opened in RW
mode.

Call to enable_source handler either returns with an active pipeline to
tuner or error if tuner is busy.

Tuner is released when frontend is released calling the disable_source
handler.
Signed-off-by: NShuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

GET_FRONTEND and G_PROPERTY can be called anytime, even when the
tuner/demod is not fully locked. However, several parameters
returned by those calls are available only after the demod get
VITERBI lock.

While several drivers do the right thing by checking the status before
returning the parameter, some drivers simply blindly update the
DTV properties cache without checking if the registers at the
hardware contain valid values.

Due to that, programs that call G_PROPERTY (or GET_FRONTEND)
before having a tuner lock may interfere at the zigzag logic,
as the DVB kthread calls the set_frontend() callback several
times, to fine tune the frequency and to identify if the signal
is inverted or not.

While the drivers should be fixed to report the right status,
we should prevent that such bugs would actually interfere at the
device operation.

So, let's use a separate var for userspace calls to get frontend.

As we copy the content of the cache, this should not cause any
troubles.
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

Instead of using the DTV properties cache directly, pass the get
frontend data as an argument. For now, everything should remain
the same, but the next patch will prevent get_frontend to
affect the global cache.

This is needed because several drivers don't care enough to only
change the properties if locked. Due to that, calling
G_PROPERTY before locking on those drivers will make them to
never lock. Ok, those drivers are crap and should never be
merged like that, but the core should not rely that the drivers
would be doing the right thing.
Reviewed-by: NMichael Ira Krufky <mkrufky@linuxtv.org>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

Instead of implicitly using the DTV cache properties at
dtv_get_frontend(), pass it as an additional argument.

This patch prepares to use a separate cache for G_PROPERTY,
in order to avoid it to mangle with the DVB thread
zigzag logic.
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

When debugging troubles with DTV properties get/set, it is
important to be able to see not only the properties from get, but
also the ones from set. So, improve the dumps to allow reporting
both.
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

Wall time obtained from ktime_get_real is susceptible to sudden jumps due to
user setting the time or due to NTP.  Boot time is constantly increasing time
better suited for comparing two timestamps.

[mchehab@osg.samsung.com: fix trivial merge conflicts]
Signed-off-by: NAbhilash Jindal <klock.android@gmail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

The space is missing after ',', and this will be introduce much
noise when checking new patch around them.
Signed-off-by: NXiubo Li <lixiubo@cmss.chinamobile.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

Since the number of elements equals to 1, so just use kzalloc to
simplify the code and make it more readable.
Signed-off-by: NXiubo Li <lixiubo@cmss.chinamobile.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

The parentheses are not required after return, and just remove it.
Signed-off-by: NXiubo Li <lixiubo@cmss.chinamobile.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

Add a new product id to dvb-usb-dvbsky for new version of TechnoTrend CT2-4650 CI
Signed-off-by: NTorbjörn Jansson <torbjorn.jansson@mbox200.swipnet.se>
Reviewed-by: NOlli Salonen <olli.salonen@iki.fi>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

The output of a tuner is not only IF frequencies. They may also
output audio on some of its pins, and may even be a zero-IF tuner,
with outputs a baseband. So, rename the PAD name to make it
clearer and add a proper documentation about that at tuner.h.

No functional changes.
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

Also Add Terratec Cinergy S2 usb id's
Signed-off-by: NBenjamin Larsson <benjamin@southpole.se>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

MyGica/Geniatech S2870 is very similar to the S870 but with dual tuner. The card is recognised as Geniatech STK8096-PVR.

[mchehab@osg.samsung.com: Fix some checkpatch.pl issues]
Signed-off-by: NNicolas Sugino <nsugino@3way.com.ar>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

Soon my dibcom.fr/parrot.com-address won't respond anymore.
Thus I'm replacing it. And, while being at it,
let's adapt some other (old) email-addresses as well.
Signed-off-by: NPatrick Boettcher <patrick.boettcher@posteo.de>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

While mxl111sf may have multiple frontends, it has just one
tuner. Reflect that on the media graph.
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

Devices like mxl111sf-based WinTV Aero-m have multiple
frontends, all linked on the same demod. Currently, the
dvb_create_graph() function is not smart enough to create
multiple links. Fix it.
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

Several pure digital TV devices have a frontend with the tuner
integrated on it. Add the RF connector when dvb_create_media_graph()
is called on such devices.

Tested with siano and dvb_usb_mxl111sf drivers.
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

Those functions are used only if CONFIG_MEDIA_CONTROLLER_DVB.
Without that, if !CONFIG_MEDIA_CONTROLLER_DVB, it would produce
two warnings:

drivers/media/dvb-core/dvbdev.c:219:12: warning: 'dvb_create_tsout_entity' defined but not used [-Wunused-function]
 static int dvb_create_tsout_entity(struct dvb_device *dvbdev,
            ^
drivers/media/dvb-core/dvbdev.c:264:12: warning: 'dvb_create_media_entity' defined but not used [-Wunused-function]
 static int dvb_create_media_entity(struct dvb_device *dvbdev,
            ^
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

The Media Controller next gen patchset added several new fields
to be used with it. Document them.
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

With the MC next gen rework, what's left for media_entity_init()
is to just initialize the PADs. However, certain devices, like
a FLASH led/light doesn't have any input or output PAD.

So, there's no reason why calling media_entity_init() would be
mandatory. Also, despite its name, what this function actually
does is to initialize the PADs data. So, rename it to
media_entity_pads_init() in order to reflect that.

The media entity actual init happens during entity register,
at media_device_register_entity(). We should move init of
num_links and num_backlinks to it.
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

We should not be creating device nodes at IRQ contexts. So,
the only flags we'll be using will be GFP_KERNEL. Let's
remove the gfp_flags, in order to make the interface simpler.

If we ever need it, it would be easy to revert those changes.

While here, remove an extra blank line.
Suggested-by: NSakari Ailus <sakari.ailus@iki.fi>
Acked-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

Indirect links are those whose interface indirectly controls
other functions.

There are two interfaces that have indirect controls at the DVB
side:
- the network interface, which also controls the demux;
- the DVR interface which also controls the demux.

One could argue that the frontend control to the tuner is indirect.
Well, that's debatable. There's no way to create subdev interfaces
for tuner and demod, as those devices are tightly coupled. So, it
was decided that just one interface is the best to control both
entities, and there's no plan (or easy way) to decouple both. So,
the DVB frontend interface should link to both entities.
Acked-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

Cleanup the code a little bit by moving the routine that creates
links between DVR and demux to the I/O entitis into a separate
function.

While here, fix the code to use strncmp() instead of strcmp().
Acked-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

Rename the userspace types from MEDIA_ENT_T_ to MEDIA_ENT_F_
and add the backward compatibility bits.

The changes at the .c files was generated by the following
coccinelle script:

@@
@@
-MEDIA_ENT_T_UNKNOWN
+MEDIA_ENT_F_UNKNOWN
@@
@@
-MEDIA_ENT_T_DVB_BASE
+MEDIA_ENT_F_DVB_BASE
@@
@@
-MEDIA_ENT_T_V4L2_BASE
+MEDIA_ENT_F_V4L2_BASE
@@
@@
-MEDIA_ENT_T_V4L2_SUBDEV_BASE
+MEDIA_ENT_F_V4L2_SUBDEV_BASE
@@
@@
-MEDIA_ENT_T_CONNECTOR_BASE
+MEDIA_ENT_F_CONNECTOR_BASE
@@
@@
-MEDIA_ENT_T_V4L2_VIDEO
+MEDIA_ENT_F_IO_V4L
@@
@@
-MEDIA_ENT_T_V4L2_VBI
+MEDIA_ENT_F_IO_VBI
@@
@@
-MEDIA_ENT_T_V4L2_SWRADIO
+MEDIA_ENT_F_IO_SWRADIO
@@
@@
-MEDIA_ENT_T_V4L2_SUBDEV_UNKNOWN
+MEDIA_ENT_F_V4L2_SUBDEV_UNKNOWN
@@
@@
-MEDIA_ENT_T_CONN_RF
+MEDIA_ENT_F_CONN_RF
@@
@@
-MEDIA_ENT_T_CONN_SVIDEO
+MEDIA_ENT_F_CONN_SVIDEO
@@
@@
-MEDIA_ENT_T_CONN_COMPOSITE
+MEDIA_ENT_F_CONN_COMPOSITE
@@
@@
-MEDIA_ENT_T_CONN_TEST
+MEDIA_ENT_F_CONN_TEST
@@
@@
-MEDIA_ENT_T_V4L2_SUBDEV_SENSOR
+MEDIA_ENT_F_CAM_SENSOR
@@
@@
-MEDIA_ENT_T_V4L2_SUBDEV_FLASH
+MEDIA_ENT_F_FLASH
@@
@@
-MEDIA_ENT_T_V4L2_SUBDEV_LENS
+MEDIA_ENT_F_LENS
@@
@@
-MEDIA_ENT_T_V4L2_SUBDEV_DECODER
+MEDIA_ENT_F_ATV_DECODER
@@
@@
-MEDIA_ENT_T_V4L2_SUBDEV_TUNER
+MEDIA_ENT_F_TUNER
@@
@@
-MEDIA_ENT_T_DVB_DEMOD
+MEDIA_ENT_F_DTV_DEMOD
@@
@@
-MEDIA_ENT_T_DVB_DEMUX
+MEDIA_ENT_F_TS_DEMUX
@@
@@
-MEDIA_ENT_T_DVB_TSOUT
+MEDIA_ENT_F_IO_DTV
@@
@@
-MEDIA_ENT_T_DVB_CA
+MEDIA_ENT_F_DTV_CA
@@
@@
-MEDIA_ENT_T_DVB_NET_DECAP
+MEDIA_ENT_F_DTV_NET_DECAP
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

Entities should have one or more functions. Calling it as a
type proofed to not be correct, as an entity could eventually
have more than one type.

So, rename the field as function.

Please notice that this patch doesn't extend support for
multiple function entities. Such change will happen when
we have real case drivers using it.

No functional changes.
Acked-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

If media controller is enabled and mdev is filled, it should
ensure that the media graph will be properly initialized.

Enforce that.
Acked-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>