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  1. 14 Jan, 2014 2 commits
  3. 13 Jan, 2014 24 commits
  5. 11 Jan, 2014 8 commits
  7. 10 Jan, 2014 2 commits
    • John Stultz's avatar
      ion: Add carveout and chunk heaps to dummy driver · 4c45b1a8
      John Stultz authored 
      Add support to the dummy driver for basic carveout and chunk heaps.

Since we're generating these heaps at module_init, and we want
this driver to be generic enough to be tested on any arch, we
don't have the ability to alloc bootmem, so both of these heaps
are conventionally allocated using alloc_pages(), which limits us
to 4M in size.

Should look into using CMA for heap allocation eventually, but
this provides enough to test the basic functionality of the
heaps.

Cc: Colin Cross <ccross@android.com>
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Jesse Barker <jesse.barker@arm.com>
Cc: Android Kernel Team <kernel-team@android.com>
Signed-off-by: default avatarJohn Stultz <john.stultz@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      4c45b1a8
    • John Stultz's avatar
      ion: Add dummy driver for testing · 1184ead8
      John Stultz authored 
      Provide a basic dummy driver to register the ion device
and to install basic SYSTEM and SYSTEM_CONTIG heaps.

This allows for basic testing with ION without having
access to drivers or systems that have been enabled to use
ION.

Cc: Colin Cross <ccross@android.com>
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Jesse Barker <jesse.barker@arm.com>
Cc: Android Kernel Team <kernel-team@android.com>
Signed-off-by: default avatarJohn Stultz <john.stultz@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      1184ead8
  9. 09 Jan, 2014 4 commits
    • Bernd Porr's avatar
      staging: comedi: usbduxsigma: removing unneccesay attached info · 27839805
      Bernd Porr authored 
      Comedi core now reports that a device has been attached so that
the driver itself won't need to do it any longer. The driver now
just outputs the offset of the ADC converter which is a soft indicator
of the health of the board and also the user can grep this value
from the kernel log easier for debugging purposes.
Signed-off-by: default avatarBernd Porr <mail@berndporr.me.uk>
Reviewed-by: default avatarIan Abbott <abbotti@mev.co.uk>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      27839805
    • Bernd Porr's avatar
      staging: comedi: usbduxsigma: return failure of auto attach · 7a45ae6e
      Bernd Porr authored 
      The function usbduxsigma_getstatusinfo() returns a negative
value in case there has been a communication error with
the board. This should always work and if this communication
fails then there is something seriously wrong with the board.
This is now returned to the caller so that it can
terminte the auto attachement. The return command also prevents
printing out the offset value in case of a fault.
Signed-off-by: default avatarBernd Porr <mail@berndporr.me.uk>
Reviewed-by: default avatarIan Abbott <abbotti@mev.co.uk>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      7a45ae6e
    • Bernd Porr's avatar
      staging: comedi: report success/failure of autoconfig · bcb6232d
      Bernd Porr authored 
      Added success message to the driver autoconfig and error
message in case it fails. A success message is required
so that the user can find out which comedi driver has been
associated with which udev device. This also makes troubleshooting
much easier when more than one card is in the computer or
there is a mix of USB and PCI devices.
As Ian suggested we should report both the driver and the board
which might have different names, especially if one driver covers a
range of different boards.
Signed-off-by: default avatarBernd Porr <mail@berndporr.me.uk>
Reviewed-by: default avatarIan Abbott <abbotti@mev.co.uk>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      bcb6232d
    • Ian Abbott's avatar
      staging: comedi: fix bug destroying subdevice files after parent · 52ef9e7c
      Ian Abbott authored 
      `comedi_free_board_dev()` is called (via `comedi_auto_unconfig()` -->
`comedi_release_hardware_device()`) when an auto-configured comedi
device is removed.  This destroys the main sysfs class device and then
calls `comedi_device_cleanup()` to clean up the comedi device.  For
comedi devices that have comedi subdevices that asynchronous commands,
the clean up involves destroying the sysfs class devices associated with
those subdevices.

There is a bug in the above sequence because the sysfs class devices
associated with the comedi subdevices are children of the sysfs class
device associated with the main comedi device.  Therefore they will have
been automatically destroyed when the main sysfs class device is
destroyed.  When they are destroyed again as part of the clean-up, they
will not be found, leading to a warning and a stack trace similar to
this:

------------[ cut here ]------------
WARNING: CPU: 1 PID: 1213 at fs/sysfs/group.c:214
sysfs_remove_group+0x4e/0xa7()
sysfs group ffffffff817504c0 not found for kobject 'comedi4_subd0'
Modules linked in: nfsd auth_rpcgss oid_registry exportfs nfs_acl lockd
bridge stp llc sunrpc fuse binfmt_misc cpufreq_userspace sr_mod
snd_hda_codec_analog cdrom powernow_k8 kvm_amd kvm amplc_pci230(C)
8255(C) comedi(C) pcmcia xhci_hcd ehci_pci pcmcia_core ohci_pci ohci_hcd
ehci_hcd usbcore snd_hda_intel snd_hda_codec snd_pcm k8temp
snd_page_alloc 8139too snd_timer snd soundcore mii usb_common forcedeth
pata_amd
CPU: 1 PID: 1213 Comm: kworker/u4:6 Tainted: G         C
3.13.0-rc5-ija1+ #20
Hardware name: System manufacturer System Product Name/M2N-E, BIOS ASUS
M2N-E ACPI BIOS Revision 5001 03/23/2010
Workqueue: sysfsd sysfs_schedule_callback_work
 0000000000000000 ffff8800bf17fb38 ffffffff814672ce ffff8800bf17fb80
 ffff8800bf17fb70 ffffffff8103470b ffffffff8114f780 0000000000000000
 ffffffff817504c0 ffff8800bf39f410 ffff880139b68670 ffff8800bf17fbd0
Call Trace:
 [<ffffffff814672ce>] dump_stack+0x45/0x56
 [<ffffffff8103470b>] warn_slowpath_common+0x7a/0x93
 [<ffffffff8114f780>] ? sysfs_remove_group+0x4e/0xa7
 [<ffffffff8103476b>] warn_slowpath_fmt+0x47/0x49
 [<ffffffff8114e92d>] ? sysfs_get_dirent_ns+0x5e/0x66
 [<ffffffff8114f780>] sysfs_remove_group+0x4e/0xa7
 [<ffffffff8132aac0>] dpm_sysfs_remove+0x37/0x3b
 [<ffffffff81323781>] device_del+0x3e/0x173
 [<ffffffff813238c3>] device_unregister+0xd/0x18
 [<ffffffff8132392e>] device_destroy+0x33/0x37
 [<ffffffffa0212086>] comedi_free_subdevice_minor+0x80/0x92 [comedi]
 [<ffffffffa02128bb>] comedi_device_detach+0x79/0x152 [comedi]
 [<ffffffffa020f223>] comedi_device_cleanup+0x36/0x57 [comedi]
 [<ffffffffa020f275>] comedi_free_board_dev+0x31/0x3c [comedi]
 [<ffffffffa0211f2a>] comedi_release_hardware_device+0x5a/0x73 [comedi]
 [<ffffffffa0212547>] comedi_auto_unconfig+0xe/0x10 [comedi]
 [<ffffffffa021357c>] comedi_pci_auto_unconfig+0x10/0x12 [comedi]
 [<ffffffff811d2335>] pci_device_remove+0x40/0x8a
 [<ffffffff813261d0>] __device_release_driver+0x84/0xda
 [<ffffffff81326244>] device_release_driver+0x1e/0x2b
 [<ffffffff811cdcb5>] pci_stop_bus_device+0x44/0x87
 [<ffffffff811cdde2>] pci_stop_and_remove_bus_device+0xd/0x18
 [<ffffffff811d3f3d>] remove_callback+0x20/0x2f
 [<ffffffff8114d1f7>] sysfs_schedule_callback_work+0xf/0x70
 [<ffffffff81049498>] process_one_work+0x1d6/0x34c
 [<ffffffff81049a5f>] worker_thread+0x1cf/0x2b5
 [<ffffffff81049890>] ? rescuer_thread+0x258/0x258
 [<ffffffff8104e0e6>] kthread+0xd6/0xde
 [<ffffffff8104e010>] ? kthread_create_on_node+0x160/0x160
 [<ffffffff81472cbc>] ret_from_fork+0x7c/0xb0
 [<ffffffff8104e010>] ? kthread_create_on_node+0x160/0x160
---[ end trace 94722aa2936a7adf ]---

To correct the bug, rearrange `comedi_free_board_dev()` to destroy the
main sysfs class device *after* the clean-up operation.

Thanks to Bernd Porr for finding the bug and his initial attempt to fix
it.
Reported-by: default avatarBernd Porr <mail@berndporr.me.uk>
Signed-off-by: default avatarIan Abbott <abbotti@mev.co.uk>
Cc: Bernd Porr <mail@berndporr.me.uk>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      52ef9e7c
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