On Mon, 2015-01-19 at 18:49 +0200, Daniel Baluta wrote: > On Mon, Jan 19, 2015 at 6:44 PM, Pandruvada, Srinivas > <srinivas.pandruv...@intel.com> wrote: > > On Mon, 2015-01-19 at 16:40 +0200, Daniel Baluta wrote: > >> Hello, > >> > >> On Sat, Dec 20, 2014 at 11:29 PM, Pandruvada, Srinivas > >> <srinivas.pandruv...@intel.com> wrote: > >> > +Mika > >> > > >> > On Sat, 2014-12-20 at 13:26 -0800, Srinivas Pandruvada wrote: > >> >> On Sat, 2014-12-20 at 00:25 +0200, Daniel Baluta wrote: > >> >> > On Sat, Dec 20, 2014 at 12:16 AM, Hartmut Knaack <knaac...@gmx.de> > >> >> > wrote: > >> >> > > Daniel Baluta schrieb am 18.12.2014 um 18:16: > >> >> > >> When using ACPI, if acpi_match_device fails then chipset enum will > >> >> > >> be > >> >> > >> uninitialized and &ak_def_array[chipset] will point to some bad > >> >> > >> address. > >> >> > >> > >> >> I am missing something. You are enumerated over i2c device, which was > >> >> created from ACPI PNP resource. There is a valid handle or and the > >> >> device has an ACPI companion at the least. If this failing, I have to > >> >> check the code for acpi i2c. > >> >> Can you check why this check failed? We may have bug in i2c handling. > >> > >> You are right about this. Under normal circumstances, if probe is called > >> then acpi_match_device will not fail. I even tried to remove the > >> device after probe > >> but before acpi_match_device, anyhow acpi_match_device was still > >> successful :) > >> > >> This is more a matter of code correctness. > >> > >> In ak8975_match_acpi_device we have: > >> > >> » const struct acpi_device_id *id; > >> > >> » id = acpi_match_device(dev->driver->acpi_match_table, dev); > >> » if (!id) > >> » » return NULL; > >> » *chipset = (int)id->driver_data; > >> > >> Compiler complains on the fact that chipset might be uninitialized > >> if this returns NULL, and we shouldn't ignore this warning even this case > >> will never happen. > >> > > Will this fix? > > data->chipset = AK8975; > > before > > ak8975_match_acpi_device(&client->dev, &data->chipset); > > > > Yes, this is done in the original patch: > > + *chipset = AK_MAX_TYPE; Since data memory is not zero alloced, other member of data are anyway initialized, so adding this also may be better. > > .. and fixes the warning. > > Daniel.
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