Commit Graph

8 Commits

Author SHA1 Message Date
Linus Torvalds 3ea369eea0 Merge branch 'topic/kbuild-fixes-for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media
Pull media build fixes from Mauro Carvalho Chehab:
 "A series of patches that fix compilation on non-x86 archs.

  While most of them are just build fixes, there are some fixes for real
  bugs, as there are a number of drivers using dynamic stack allocation.
  A few of those might be considered a security risk, if the i2c-dev
  module is loaded, as someone could be sending very long I2C data that
  could potentially overflow the Kernel stack.  Ok, as using /dev/i2c-*
  devnodes usually requires root on usual distros, and exploiting it
  would require a DVB board or USB stick, the risk is not high"

* 'topic/kbuild-fixes-for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (28 commits)
  [media] platform drivers: Fix build on frv arch
  [media] lirc_zilog: Don't use dynamic static allocation
  [media] mxl111sf: Don't use dynamic static allocation
  [media] af9035: Don't use dynamic static allocation
  [media] af9015: Don't use dynamic static allocation
  [media] dw2102: Don't use dynamic static allocation
  [media] dibusb-common: Don't use dynamic static allocation
  [media] cxusb: Don't use dynamic static allocation
  [media] v4l2-async: Don't use dynamic static allocation
  [media] cimax2: Don't use dynamic static allocation
  [media] tuner-xc2028: Don't use dynamic static allocation
  [media] tuners: Don't use dynamic static allocation
  [media] av7110_hw: Don't use dynamic static allocation
  [media] stv090x: Don't use dynamic static allocation
  [media] stv0367: Don't use dynamic static allocation
  [media] stb0899_drv: Don't use dynamic static allocation
  [media] dvb-frontends: Don't use dynamic static allocation
  [media] dvb-frontends: Don't use dynamic static allocation
  [media] s5h1420: Don't use dynamic static allocation
  [media] uvc/lirc_serial: Fix some warnings on parisc arch
  ...
2013-11-18 15:10:05 -08:00
Mauro Carvalho Chehab f1baab870f [media] tuners: Don't use dynamic static allocation
Dynamic static allocation is evil, as Kernel stack is too low, and
compilation complains about it on some archs:
	drivers/media/tuners/e4000.c:50:1: warning: 'e4000_wr_regs' uses dynamic stack allocation [enabled by default]
	drivers/media/tuners/e4000.c:83:1: warning: 'e4000_rd_regs' uses dynamic stack allocation [enabled by default]
	drivers/media/tuners/fc2580.c:66:1: warning: 'fc2580_wr_regs.constprop.1' uses dynamic stack allocation [enabled by default]
	drivers/media/tuners/fc2580.c:98:1: warning: 'fc2580_rd_regs.constprop.0' uses dynamic stack allocation [enabled by default]
	drivers/media/tuners/tda18212.c:57:1: warning: 'tda18212_wr_regs' uses dynamic stack allocation [enabled by default]
	drivers/media/tuners/tda18212.c:90:1: warning: 'tda18212_rd_regs.constprop.0' uses dynamic stack allocation [enabled by default]
	drivers/media/tuners/tda18218.c:60:1: warning: 'tda18218_wr_regs' uses dynamic stack allocation [enabled by default]
	drivers/media/tuners/tda18218.c:92:1: warning: 'tda18218_rd_regs.constprop.0' uses dynamic stack allocation [enabled by default]
Instead, let's enforce a limit for the buffer. Considering that I2C
transfers are generally limited, and that devices used on USB has a
max data length of 64 bytes for	the control URBs.
So, it seem safe to use 64 bytes as the hard limit for all those devices.
 On most cases, the limit is a way lower than that, but	this limit
is small enough to not affect the Kernel stack, and it is a no brain
limit, as using smaller ones would require to either carefully each
driver or to take a look on each datasheet.

Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Reviewed-by: Hans Verkuil <hans.verkuil@cisco.com>
Reviewed-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
2013-11-08 09:45:41 -02:00
Antti Palosaari 35c00c98a2 [media] e4000: fix PLL calc bug on 32-bit arch
Fix long-lasting bug that causes tuning failure of some frequencies
on 32-bit arch.
Special thanks goes to Damien CABROL who finally find root of the bug.
Also big thanks to Jacek Konieczny for donating "non-working" device.

[crope@iki.fi: fix trivial merge conflict]
[m.chehab@samsung.com: add missing header file]
Reported-by: Jacek Konieczny <jajcus@jajcus.net>
Reported-by: Torsten Seyffarth <t.seyffarth@gmx.de>
Reported-by: Jan Taegert <jantaegert@gmx.net>
Reported-by: Damien CABROL <cabrol.damien@free.fr>
Tested-by: Damien CABROL <cabrol.damien@free.fr>
Tested-by: Jan Taegert <jantaegert@gmx.net>
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
2013-09-24 13:20:19 -03:00
Antti Palosaari 4a337d5cdf [media] e4000: make checkpatch.pl happy
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
2013-08-18 07:52:52 -03:00
Antti Palosaari d4992da387 [media] e4000: use swap() macro
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
2013-08-18 07:52:51 -03:00
Antti Palosaari 8514611438 [media] e4000: implement DC offset correction
I did some tests against modulator (television signal generator) and this
seems to improve sensitivity a little bit on channel I used. Used device
was able to receive transmission just as weak signal as with Windows XP.
Thanks to Jacek for donating his non-working device. I cannot ask he to
test anymore...

Reported-by: Jacek Konieczny <jajcus@jajcus.net>
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
2013-08-18 07:52:50 -03:00
Antti Palosaari 36f647bad3 [media] e4000: fix crash when attach fails
Callbacks were set even attach failed. This leads calling
.release() in error case and resulted crash.

Reported-by: Oliver Schinagl <oliver@schinagl.nl>
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2012-09-27 15:17:44 -03:00
Antti Palosaari ed85adaad6 [media] Elonics E4000 silicon tuner driver
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2012-09-18 12:24:59 -03:00