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Date: Mon, 29 Jun 2009 09:55:35 +0200 From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de> To: Greg KH <gregkh@...e.de> Cc: linux-kernel@...r.kernel.org Subject: Re: [PATCH] platform_driver_register: warn if probe is in .init.text Hi Greg, On Fri, Jun 19, 2009 at 04:43:54PM +0200, Uwe Kleine-König wrote: > On Fri, Jun 19, 2009 at 07:11:28AM -0700, Greg KH wrote: > > On Fri, Jun 19, 2009 at 03:42:19PM +0200, Uwe Kleine-König wrote: > > > Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de> > > > --- > > > drivers/base/platform.c | 42 ++++++++++++++++++++++++++++++++++++------ > > > include/linux/kernel.h | 2 ++ > > > include/linux/module.h | 12 ++++++++++++ > > > kernel/extable.c | 12 ++++++++++++ > > > kernel/module.c | 36 ++++++++++++++++++++++++++++++++++++ > > > 5 files changed, 98 insertions(+), 6 deletions(-) > > > > > > diff --git a/drivers/base/platform.c b/drivers/base/platform.c > > > index 81cb01b..851ba84 100644 > > > --- a/drivers/base/platform.c > > > +++ b/drivers/base/platform.c > > > @@ -470,11 +470,7 @@ static void platform_drv_shutdown(struct device *_dev) > > > drv->shutdown(dev); > > > } > > > > > > -/** > > > - * platform_driver_register > > > - * @drv: platform driver structure > > > - */ > > > -int platform_driver_register(struct platform_driver *drv) > > > +static int __platform_driver_register(struct platform_driver *drv) > > > { > > > drv->driver.bus = &platform_bus_type; > > > if (drv->probe) > > > @@ -489,6 +485,40 @@ int platform_driver_register(struct platform_driver *drv) > > > > > > return driver_register(&drv->driver); > > > } > > > + > > > +/** > > > + * platform_driver_register > > > + * @drv: platform driver structure > > > + */ > > > +int platform_driver_register(struct platform_driver *drv) > > > +{ > > > + int ret = __platform_driver_register(drv); > > > + > > > +#if defined(CONFIG_HOTPLUG) > > > + /* > > > + * drivers that are registered by platform_driver_register > > > + * should not have their probe function in .init.text. The > > > + * reason is that a probe can happen after .init.text is > > > + * discarded which then results in an oops. The alternatives > > > + * are using .devinit.text for the probe function or "register" > > > + * with platform_driver_probe. > > > + */ > > > > That's not true, remember, drivers built into the system, like platform > > ones, can have their probe function in .init.text, as it will be called > > before we discard .init.text, and will never be called again as the > > device will never be "hot added" at any future time. > > > > So this could trigger a lot of false positives :( > IMHO this is not a false positive. You can still do > > for f in unbind bind do echo $deviceid > /sys/bus/platform/drivers/$drivername/$f; done > > This type of driver should use platform_driver_probe. Are you conviced and took the patch or did you give up to convince me? I still think the patch is correct and I'd like to have it applied. Best regards Uwe -- Pengutronix e.K. | Uwe Kleine-König | Industrial Linux Solutions | http://www.pengutronix.de/ | -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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