On Mon, Sep 15, 2014 at 01:00:07PM -0700, Darren Hart wrote: > On Sat, Sep 13, 2014 at 01:06:46AM +0200, Frans Klaver wrote: > > The disp attribute is write-only, but sysfs doesn't know this. Currently > > show_sys_acpi() is mimicking sysfs behavior, if the underlying acpi call > > should fail. This is not ideal; behaving like sysfs is better left to > > sysfs. > > > > Introduce EEEPC_CREATE_DEVICE_ATTR_WO() to instantiate a write-only > > attribute, and declare the disp attribute with it. Sysfs makes sure > > userspace can only write to disp at all times. This also means we can > > back to propagating any errors from get_acpi(). > > > > Signed-off-by: Frans Klaver <franskla...@gmail.com> > > --- > > drivers/platform/x86/eeepc-laptop.c | 8 ++++++-- > > 1 file changed, 6 insertions(+), 2 deletions(-) > > > > diff --git a/drivers/platform/x86/eeepc-laptop.c > > b/drivers/platform/x86/eeepc-laptop.c > > index 3c04b77..4f6490d 100644 > > --- a/drivers/platform/x86/eeepc-laptop.c > > +++ b/drivers/platform/x86/eeepc-laptop.c > > @@ -291,7 +291,7 @@ static ssize_t show_sys_acpi(struct device *dev, int > > cm, char *buf) > > int value = get_acpi(eeepc, cm); > > > > if (value < 0) > > - return -EIO; > > + return value; > > return sprintf(buf, "%d\n", value); > > } > > > > @@ -316,9 +316,13 @@ static ssize_t show_sys_acpi(struct device *dev, int > > cm, char *buf) > > EEEPC_ACPI_STORE_FUNC(_name, _cm) \ > > static DEVICE_ATTR(_name, _mode, show_##_name, store_##_name) > > > > +#define EEEPC_CREATE_DEVICE_ATTR_WO(_name, _mode, _cm) > > \ > > + EEEPC_ACPI_STORE_FUNC(_name, _cm) \ > > + static DEVICE_ATTR(_name, _mode, NULL, store_##_name) > > Per Greg's previous reply, I presume DEVICE_ATTR_WO here?
Yes, already taken care of in all similar cases. Thanks, Frans -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
