staging:iio:ad5933: Fix NULL pointer deref when enabling buffer

In older versions of the IIO framework it was possible to pass a
completely different set of channels to iio_buffer_register() as the one
that is assigned to the IIO device. Commit 959d2952d124 ("staging:iio: make
iio_sw_buffer_preenable much more general.") introduced a restriction that
requires that the set of channels that is passed to iio_buffer_register() is
a subset of the channels assigned to the IIO device as the IIO core will use
the list of channels that is assigned to the device to lookup a channel by
scan index in iio_compute_scan_bytes(). If it can not find the channel the
function will crash. This patch fixes the issue by making sure that the same
set of channels is assigned to the IIO device and passed to
iio_buffer_register().

Fixes the follow NULL pointer derefernce kernel crash:
	Unable to handle kernel NULL pointer dereference at virtual address 00000016
	pgd = d53d0000
	[00000016] *pgd=1534e831, *pte=00000000, *ppte=00000000
	Internal error: Oops: 17 [#1] PREEMPT SMP ARM
	Modules linked in:
	CPU: 1 PID: 1626 Comm: bash Not tainted 3.15.0-19969-g2a180eb-dirty #9545
	task: d6c124c0 ti: d539a000 task.ti: d539a000
	PC is at iio_compute_scan_bytes+0x34/0xa8
	LR is at iio_compute_scan_bytes+0x34/0xa8
	pc : [<c03052e4>]    lr : [<c03052e4>]    psr: 60070013
	sp : d539beb8  ip : 00000001  fp : 00000000
	r10: 00000002  r9 : 00000000  r8 : 00000001
	r7 : 00000000  r6 : d6dc8800  r5 : d7571000  r4 : 00000002
	r3 : d7571000  r2 : 00000044  r1 : 00000001  r0 : 00000000
	Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
	Control: 18c5387d  Table: 153d004a  DAC: 00000015
	Process bash (pid: 1626, stack limit = 0xd539a240)
	Stack: (0xd539beb8 to 0xd539c000)
	bea0:                                                       c02fc0e4 d7571000
	bec0: d76c1640 d6dc8800 d757117c 00000000 d757112c c0305b04 d76c1690 d76c1640
	bee0: d7571188 00000002 00000000 d7571000 d539a000 00000000 000dd1c8 c0305d54
	bf00: d7571010 0160b868 00000002 c69d3900 d7573278 d7573308 c69d3900 c01ece90
	bf20: 00000002 c0103fac c0103f6c d539bf88 00000002 c69d3b00 c69d3b0c c0103468
	bf40: 00000000 00000000 d7694a00 00000002 000af408 d539bf88 c000dd84 c00b2f94
	bf60: d7694a00 000af408 00000002 d7694a00 d7694a00 00000002 000af408 c000dd84
	bf80: 00000000 c00b32d0 00000000 00000000 00000002 b6f1aa78 00000002 000af408
	bfa0: 00000004 c000dc00 b6f1aa78 00000002 00000001 000af408 00000002 00000000
	bfc0: b6f1aa78 00000002 000af408 00000004 be806a4c 000a6094 00000000 000dd1c8
	bfe0: 00000000 be8069cc b6e8ab77 b6ec125c 40070010 00000001 22940489 154a5007
	[<c03052e4>] (iio_compute_scan_bytes) from [<c0305b04>] (__iio_update_buffers+0x248/0x438)
	[<c0305b04>] (__iio_update_buffers) from [<c0305d54>] (iio_buffer_store_enable+0x60/0x7c)
	[<c0305d54>] (iio_buffer_store_enable) from [<c01ece90>] (dev_attr_store+0x18/0x24)
	[<c01ece90>] (dev_attr_store) from [<c0103fac>] (sysfs_kf_write+0x40/0x4c)
	[<c0103fac>] (sysfs_kf_write) from [<c0103468>] (kernfs_fop_write+0x110/0x154)
	[<c0103468>] (kernfs_fop_write) from [<c00b2f94>] (vfs_write+0xd0/0x160)
	[<c00b2f94>] (vfs_write) from [<c00b32d0>] (SyS_write+0x40/0x78)
	[<c00b32d0>] (SyS_write) from [<c000dc00>] (ret_fast_syscall+0x0/0x30)
	Code: ea00000e e1a01008 e1a00005 ebfff6fc (e5d0a016)

Fixes: 959d2952d124 ("staging:iio: make iio_sw_buffer_preenable much more general.")
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Cc: Stable@vger.kernel.org
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
staging:iio:ad5933: Drop "raw" from channel names

"raw" is the name of a channel property, but should not be part of the
channel name itself.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
iio: st_sensors: Fix buffer copy

Use byte_for_channel as iterator to properly initialize the buffer.

Signed-off-by: Robin van der Gracht <robin@protonic.nl>
Acked-by: Denis Ciocca <denis.ciocca@st.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Cc: <Stable@vger.kernel.org>
iio: adc: mxs-lradc: Disable the clock on probe failure

We should disable lradc->clk in the case of errors in the probe function.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Cc: <Stable@vger.kernel.org>
staging: comedi: (regression) channel list must be set for COMEDI_CMD ioctl

`do_cmd_ioctl()`, the handler for the `COMEDI_CMD` ioctl can incorrectly
call the Comedi subdevice's `do_cmd()` handler with a NULL channel list
pointer.  This is a regression as the `do_cmd()` handler has never been
expected to deal with that, leading to a kernel OOPS when it tries to
dereference it.

A NULL channel list pointer is allowed for the `COMEDI_CMDTEST` ioctl,
handled by `do_cmdtest_ioctl()` and the subdevice's `do_cmdtest()`
handler, but not for the `COMEDI_CMD` ioctl and its handlers.

Both `do_cmd_ioctl()` and `do_cmdtest_ioctl()` call
`__comedi_get_user_chanlist()` to copy the channel list from user memory
into dynamically allocated kernel memory and check it for consistency.
That function currently returns 0 if the `user_chanlist` parameter
(pointing to the channel list in user memory) is NULL.  That's fine for
`do_cmdtest_ioctl()`, but `do_cmd_ioctl()` incorrectly assumes the
kernel copy of the channel list has been set-up correctly.

Fix it by not allowing the `user_chanlist` parameter to be NULL in
`__comedi_get_user_chanlist()`, and only calling it from
`do_cmdtest_ioctl()` if the parameter is non-NULL.

Thanks to Bernd Porr for reporting the bug via an initial patch sent
privately.

Fixes: c6cd0eefb27b ("staging: comedi: comedi_fops: introduce __comedi_get_user_chanlist()")
Reported-by: Bernd Porr <mail@berndporr.me.uk>
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Bernd Porr <mail@berndporr.me.uk>
Cc: <stable@vger.kernel.org> # 3.15.y 3.16.y 3.17.y
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/staging/comedi/Kconfig: Let COMEDI_II_PCI20KC depend on HAS_IOMEM

COMEDI_II_PCI20KC needs HAS_IOMEM, so depend on it. The related error (
with allmodconfig under um):

    CC [M]  drivers/staging/comedi/drivers/ii_pci20kc.o
  drivers/staging/comedi/drivers/ii_pci20kc.c: In function ‘ii20k_attach’:
  drivers/staging/comedi/drivers/ii_pci20kc.c:442:2: error: implicit declaration of function ‘ioremap’ [-Werror=implicit-function-declaration]
    dev->mmio = ioremap(membase, II20K_SIZE);
    ^
  drivers/staging/comedi/drivers/ii_pci20kc.c:442:12: warning: assignment makes pointer from integer without a cast [enabled by default]
    dev->mmio = ioremap(membase, II20K_SIZE);
              ^
  drivers/staging/comedi/drivers/ii_pci20kc.c: In function ‘ii20k_detach’:
  drivers/staging/comedi/drivers/ii_pci20kc.c:512:3: error: implicit declaration of function ‘iounmap’ [-Werror=implicit-function-declaration]
     iounmap(dev->mmio);
     ^

Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
staging: rtl8723au: Fix alignment of mac_addr for ether_addr_copy() usage

Make sure struct eeprom_priv->mac_addr is 2 byte aligned to work with
ether_addr_copy()

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
usb: dwc3: trace: don't dereference pointers

The way trace works is that it won't decode strings
until we read the actual trace. Because of that, we
can't make assumptions of pointers still being valid
at the time we read the trace. In order to avoid that,
just copy all fields from every struct pointer we need
for our traces.

Ths patch fixes the following bug:

[ 2940.039229] Unable to handle kernel paging request at virtual address 814efa9e
[ 2940.046904] pgd = ec3dc000
[ 2940.049737] [814efa9e] *pgd=00000000
[ 2940.053552] Internal error: Oops: 5 [#1] SMP ARM
[ 2940.058379] Modules linked in: usb_f_acm u_serial g_serial usb_f_uac2 libcomposite configfs xhci_hcd dwc3 udc_core matrix_keypad dwc3_omap lis3lv02d_i2c lis3lv02d input_polldev [last unloaded: g_audio]
[ 2940.077238] CPU: 0 PID: 3020 Comm: tail Tainted: G        W
3.17.0-rc5-dirty #1097
[ 2940.085596] task: ed1b1040 ti: ed07c000 task.ti: ed07c000
[ 2940.091258] PC is at strnlen+0x18/0x68
[ 2940.095177] LR is at 0xfffffffe
[ 2940.098454] pc : [<c0356df8>]    lr : [<fffffffe>]    psr: a0000013
[ 2940.098454] sp : ed07ddb0  ip : ed07ddc0  fp : ed07ddbc
[ 2940.110445] r10: c070ff70  r9 : ed07de70  r8 : 00000000
[ 2940.115906] r7 : 814efa9e  r6 : ffffffff  r5 : ed4b6087  r4 : ed4b50c7
[ 2940.122726] r3 : 00000000  r2 : 814efa9e  r1 : ffffffff  r0 : 814efa9e
[ 2940.129546] Flags: NzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM Segment user
[ 2940.137000] Control: 10c5387d  Table: ac3dc059  DAC: 00000015
[ 2940.143006] Process tail (pid: 3020, stack limit = 0xed07c248)
[ 2940.149098] Stack: (0xed07ddb0 to 0xed07e000)
[ 2940.153660] dda0:                                     ed07dde4 ed07ddc0 c0359628 c0356dec
[ 2940.162203] ddc0: 00000000 ed4b50c7 bf03ae9c ed4b6087 bf03ae9e 00000002 ed07de3c ed07dde8
[ 2940.170740] dde0: c035ab50 c0359600 ffffffff ffffffff ff0a0000 ffffffff ed07de30 ed4b5088
[ 2940.179275] de00: ed4b50c7 00000fc0 ff0a0004 ffffffff ed4b5088 ed4b5088 00000000 00001000
[ 2940.187810] de20: 00001008 00000fc0 ed4b5088 00000000 ed07de68 ed07de40 c00f1e64 c035a9c4
[ 2940.196341] de40: bf03dae0 ed07de70 ed4b4000 ec25b280 ed4b4000 ec25b280 bf03dae0 ed07de9c
[ 2940.204886] de60: ed07de78 bf033324 c00f1e0c bf03ae9c 814efa9e ed428bc0 814eca3e 00000000
[ 2940.213428] de80: 814eba3e ed4b4000 03bd1201 c0c34790 ed07ded4 ed07dea0 c00edc0c bf0332d0
[ 2940.221994] dea0: 000002c7 ed07df10 ed07decc ed07deb8 ed4b4000 0000209c ec278ac0 00000000
[ 2940.230536] dec0: 00002000 ec0db340 ed07def4 ed07ded8 c00ee7ec c00eda90 c00ee7b0 ec278ac0
[ 2940.239075] dee0: ed4b4000 000002d5 ed07df44 ed07def8 c018b8d0 c00ee7bc c0166d3c ec278af0
[ 2940.247621] df00: 0001f090 ed07df78 000002c7 00000000 000002c8 00000000 00000000 ec0db340
[ 2940.256173] df20: 0001f090 ed07df78 ec0db340 00002000 0001f090 00000000 ed07df74 ed07df48
[ 2940.264729] df40: c0166e98 c018b5f4 00000001 c018535c 000168c1 00000000 ec0db340 ec0db340
[ 2940.273284] df60: 00002000 0001f090 ed07dfa4 ed07df78 c01675c4 c0166e0c 000168c1 00000000
[ 2940.281829] df80: 00002000 0000000a 0001f090 00000003 c000f064 ed07c000 00000000 ed07dfa8
[ 2940.290365] dfa0: c000ede0 c0167584 00002000 0000000a 00000003 0001f090 00002000 00000000
[ 2940.298909] dfc0: 00002000 0000000a 0001f090 00000003 7fffe000 0001e1e0 00002004 0000002f
[ 2940.307445] dfe0: 00000000 beed38ec 000104c8 b6e6397c 40000010 00000003 00000000 00000000
[ 2940.315992] [<c0356df8>] (strnlen) from [<c0359628>] (string.isra.8+0x34/0xe8)
[ 2940.323534] [<c0359628>] (string.isra.8) from [<c035ab50>] (vsnprintf+0x198/0x3fc)
[ 2940.331461] [<c035ab50>] (vsnprintf) from [<c00f1e64>] (trace_seq_printf+0x68/0x94)
[ 2940.339494] [<c00f1e64>] (trace_seq_printf) from [<bf033324>] (ftrace_raw_output_dwc3_log_request+0x60/0x78 [dwc3])
[ 2940.350424] [<bf033324>] (ftrace_raw_output_dwc3_log_request [dwc3]) from [<c00edc0c>] (print_trace_line+0x188/0x418)
[ 2940.361507] [<c00edc0c>] (print_trace_line) from [<c00ee7ec>] (s_show+0x3c/0x12c)
[ 2940.369330] [<c00ee7ec>] (s_show) from [<c018b8d0>] (seq_read+0x2e8/0x4a0)
[ 2940.376519] [<c018b8d0>] (seq_read) from [<c0166e98>] (vfs_read+0x98/0x158)
[ 2940.383796] [<c0166e98>] (vfs_read) from [<c01675c4>] (SyS_read+0x4c/0xa0)
[ 2940.390981] [<c01675c4>] (SyS_read) from [<c000ede0>] (ret_fast_syscall+0x0/0x48)
[ 2940.398792] Code: e24cb004 e3510000 e241e001 0a000011 (e5d01000)
[ 2940.406980] ---[ end trace d8b38370fbb531f3 ]---

Signed-off-by: Felipe Balbi <balbi@ti.com>
usb: dwc3: ep0: hold our lock in dwc3_gadget_ep0_set_halt

dwc3_gadget_ep0_set_halt() will be called without
locks held in some cases, so we must hold the lock
on our own. While at that, also add a version without
locks to be called in certain conditions.

Signed-off-by: Felipe Balbi <balbi@ti.com>
usb: dwc3: gadget: move isoc endpoint check to unlocked set_halt

__dwc3_gadget_ep_set_halt() is the function which
handles the actual halt feature. In order to cope
with some extra cleanup comming as a follow-up patch
let's move the isochronous endpoint check there too.

Signed-off-by: Felipe Balbi <balbi@ti.com>
usb: dwc3: gadget: hold the lock through set_wedge()'s life

Instead of releasing the lock and calling locked
versions of our set_halt() methods, let's hold
the lock all the way through and call unlocked
versions of those functions.

Signed-off-by: Felipe Balbi <balbi@ti.com>
usb: dwc3: gadget: fix set_halt() bug with pending transfers

According to our Gadget Framework API documentation,
->set_halt() *must* return -EAGAIN if we have pending
transfers (on either direction) or FIFO isn't empty (on
TX endpoints).

Fix this bug so that the mass storage gadget can be used
without stall=0 parameter.

This patch should be backported to all kernels since v3.2.

Cc: <stable@vger.kernel.org> # v3.2+
Suggested-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Felipe Balbi <balbi@ti.com>
usb: gadget: function: uvc: conditionally dequeue

We shouldn't try to dequeue a NULL pointer.

Signed-off-by: Felipe Balbi <balbi@ti.com>
usb: gadget: function: uvc: make sure to balance ep enable/disable

If a set_alt() to the same alternate setting that's
already selected is received, functions are required
to reset the interface state, this means we must disable
all endpoints and reenable them again.

This is also documented on our kdoc for struct usb_function

* @set_alt: (REQUIRED) Reconfigures altsettings; function drivers may
*	initialize usb_ep.driver data at this time (when it is used).
*	Note that setting an interface to its current altsetting resets
*	interface state, and that all interfaces have a disabled state.

Signed-off-by: Felipe Balbi <balbi@ti.com>
usb: gadget: function: uvc: return correct alt-setting

If our alternate setting has been selected, we must
return that on a subsequent Get Interface request
even if we're not streaming.

Signed-off-by: Felipe Balbi <balbi@ti.com>
usb: gadget: function: acm: make f_acm pass USB20CV Chapter9

During Halt Endpoint Test, our interrupt endpoint
will be disabled, which will clear out ep->desc
to NULL. Unless we call config_ep_by_speed() again,
we will not be able to enable this endpoint which
will make us fail that test.

Fixes: f9c56cd (usb: gadget: Clear usb_endpoint_descriptor
	inside the struct usb_ep on disable)
Cc: <stable@vger.kernel.org> # v3.4+
Signed-off-by: Felipe Balbi <balbi@ti.com>
usb: gadget: function: uvc: manage our video control endpoint

just like any other endpoint, we must enable/disable
our video control endpoint based on calls to our
->set_alt() method.

Signed-off-by: Felipe Balbi <balbi@ti.com>
usb: gadget: function: uvc: disable endpoints on ->disable()

when our ->disable() method is called, we must
make sure to teardown all our resources, including
endpoints.

Signed-off-by: Felipe Balbi <balbi@ti.com>
usb: gadget: function: uac2: add wMaxPacketSize to ep desc

Endpoint descriptors should pass wMaxPacketSize. Note
that this also fixes USB20CV Other Speed Endpoint
Descriptor Tests.

Signed-off-by: Felipe Balbi <balbi@ti.com>
usb: gadget: function: uac2: prevent double ep disable

without this check, f_uac2 would try to disable
the same endpoint twice. Fix that.

Signed-off-by: Felipe Balbi <balbi@ti.com>