On Sun, Jul 15, 2012 at 11:11:52PM +0200, Lars-Peter Clausen wrote: > On 07/15/2012 10:40 PM, Hartmut Knaack wrote: > > This patchset makes the ADT7410 usable. Main reason was the following error when trying to register one of these devices: > > [ 180.945561] BUG: unable to handle kernel NULL pointer dereference at (null) > > [ 180.945592] IP: [<f84b1e80>] iio_device_register_eventset+0x380/0x3a0 [industrialio] > > This happens, since in industrialio-events.c __iio_add_event_config_attrs (which does a INIT_LIST_HEAD) is not called, if the channels attribute of the device is not set. As a result, list_for_each_entry causes those NULL pointer dereference problems. So, before trying to access those list elements, we check for their existence (also in unregister functions). > > Now the adt7410.c ended in some complex changes - my apologies for this: > > > > * check for exact values provided through sysfs, otherwise output a verbose error/usage message for: sample mode, resolution, event mode > > * adt7410_show_id: I don't see a point in masking out some LSBs, if they get shifted to oblivion, anyway -> no more need for ADT7410_MANUFACTORY_ID_MASK > > * adt7410_convert_temperature: in 13 bit mode, the driver assumed the data to be stored in bits 0-12, but according to the data sheet, it is stored in bits 3-15. Temperature readings were always around 200(°C), while real temperature was something around 20(°C). Simple fix: mask out bits 0-2 in 13 bit mode and use the 16 bit routines from that point on. > > * adt7410_set_t_bound: handle float values provided through sysfs properly. Also, simplify treatment of 13 bit values by masking out bits 0-2. > > * adt7410_probe, adt7410_remove: fix another possible NULL pointer dereference issue, in case no platform data is provided. Sync chip->config with the config register > > Hi, > > Sascha Hauer posted a couple of patches a while ago which seem to fix a > similar set of issues. > > See: http://www.spinics.net/lists/linux-iio/msg05947.html and > http://www.spinics.net/lists/linux-iio/msg05955.html Indeed, most if not all of the mentioned issues should be fixed already with these patches. Sascha -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
