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Date: Sat, 18 Aug 2007 04:40:39 +0200
From: Kay Sievers <kay.sievers@...y.org>
To: David Brownell <david-b@...bell.net>
Cc: Atsushi Nemoto <anemo@....ocn.ne.jp>, jengelh@...putergmbh.de,
a.zummo@...ertech.it, linux-kernel@...r.kernel.org,
rtc-linux@...glegroups.com, Greg KH <greg@...ah.com>
Subject: Re: [PATCH] rtc: Make rtc-ds1742 driver hotplug-aware
On Fri, 2007-08-17 at 12:50 -0700, David Brownell wrote:
> On Friday 17 August 2007, Kay Sievers wrote:
> > On Fri, 2007-08-17 at 09:55 -0700, David Brownell wrote:
> > >
> > > If so, then whoever tried to change the usage of module aliases
> > > in that way goofed in several ways. First, by not changing all
> > > the in-kernel uses. Second, by not changing all the out-of-tree
> > > uses in various distros, toolchains, etc. Third, by not even
> > > documenting that change...
> >
> > Yes, please fix the misuse of MODALIAS.
>
> I'm not the one who's advocating a change here. If you want to
> first change/break and then fix things, all of that is up to you.
I'm happy to do that. Patch is attached.
Thanks,
Kay
From: Kay Sievers <kay.sievers@...y.org>
Subject: platform: prefix MODALIAS with "platform:"
Prefix platform modalias strings with "platform:", which
modprobe config to blacklist alias resolving if userspace
configures it.
Send uevents for all platform devices.
Add MODULE_ALIAS's to: pxa2xx_pcmcia, ds1742 and pcspkr to trigger
module autoloading by userspace.
$ modinfo pcspkr
alias: platform:pcspkr
license: GPL
description: PC Speaker beeper driver
...
$ modprobe -n -v platform:pcspkr
insmod /lib/modules/2.6.23-rc3-g28e8351a-dirty/kernel/drivers/input/misc/pcspkr.ko
Signed-off-by: Kay Sievers <kay.sievers@...y.org>
---
base/platform.c | 15 ++-------------
input/misc/pcspkr.c | 1 +
pcmcia/pxa2xx_mainstone.c | 2 +-
pcmcia/pxa2xx_sharpsl.c | 2 +-
rtc/rtc-ds1742.c | 1 +
5 files changed, 6 insertions(+), 15 deletions(-)
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 869ff8c..9bfc434 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -160,11 +160,6 @@ static void platform_device_release(struct device *dev)
*
* Create a platform device object which can have other objects attached
* to it, and which will have attached objects freed when it is released.
- *
- * This device will be marked as not supporting hotpluggable drivers; no
- * device add/remove uevents will be generated. In the unusual case that
- * the device isn't being dynamically allocated as a legacy "probe the
- * hardware" driver, infrastructure code should reverse this marking.
*/
struct platform_device *platform_device_alloc(const char *name, unsigned int id)
{
@@ -177,12 +172,6 @@ struct platform_device *platform_device_alloc(const char *name, unsigned int id)
pa->pdev.id = id;
device_initialize(&pa->pdev.dev);
pa->pdev.dev.release = platform_device_release;
-
- /* prevent hotplug "modprobe $(MODALIAS)" from causing trouble in
- * legacy probe-the-hardware drivers, which don't properly split
- * out device enumeration logic from drivers.
- */
- pa->pdev.dev.uevent_suppress = 1;
}
return pa ? &pa->pdev : NULL;
@@ -530,7 +519,7 @@ static ssize_t
modalias_show(struct device *dev, struct device_attribute *a, char *buf)
{
struct platform_device *pdev = to_platform_device(dev);
- int len = snprintf(buf, PAGE_SIZE, "%s\n", pdev->name);
+ int len = snprintf(buf, PAGE_SIZE, "platform:%s\n", pdev->name);
return (len >= PAGE_SIZE) ? (PAGE_SIZE - 1) : len;
}
@@ -546,7 +535,7 @@ static int platform_uevent(struct device *dev, char **envp, int num_envp,
struct platform_device *pdev = to_platform_device(dev);
envp[0] = buffer;
- snprintf(buffer, buffer_size, "MODALIAS=%s", pdev->name);
+ snprintf(buffer, buffer_size, "MODALIAS=platform:%s", pdev->name);
return 0;
}
diff --git a/drivers/input/misc/pcspkr.c b/drivers/input/misc/pcspkr.c
index 906bf5e..e1a4402 100644
--- a/drivers/input/misc/pcspkr.c
+++ b/drivers/input/misc/pcspkr.c
@@ -23,6 +23,7 @@
MODULE_AUTHOR("Vojtech Pavlik <vojtech@....cz>");
MODULE_DESCRIPTION("PC Speaker beeper driver");
MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:pcspkr");
#ifdef CONFIG_X86
/* Use the global PIT lock ! */
diff --git a/drivers/pcmcia/pxa2xx_mainstone.c b/drivers/pcmcia/pxa2xx_mainstone.c
index 383107b..f6722ba 100644
--- a/drivers/pcmcia/pxa2xx_mainstone.c
+++ b/drivers/pcmcia/pxa2xx_mainstone.c
@@ -175,7 +175,6 @@ static int __init mst_pcmcia_init(void)
if (!mst_pcmcia_device)
return -ENOMEM;
- mst_pcmcia_device->dev.uevent_suppress = 0;
mst_pcmcia_device->dev.platform_data = &mst_pcmcia_ops;
ret = platform_device_add(mst_pcmcia_device);
@@ -195,3 +194,4 @@ fs_initcall(mst_pcmcia_init);
module_exit(mst_pcmcia_exit);
MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:pxa2xx-pcmcia");
diff --git a/drivers/pcmcia/pxa2xx_sharpsl.c b/drivers/pcmcia/pxa2xx_sharpsl.c
index a2daa3f..d5c33bd 100644
--- a/drivers/pcmcia/pxa2xx_sharpsl.c
+++ b/drivers/pcmcia/pxa2xx_sharpsl.c
@@ -261,7 +261,6 @@ static int __init sharpsl_pcmcia_init(void)
if (!sharpsl_pcmcia_device)
return -ENOMEM;
- sharpsl_pcmcia_device->dev.uevent_suppress = 0;
sharpsl_pcmcia_device->dev.platform_data = &sharpsl_pcmcia_ops;
sharpsl_pcmcia_device->dev.parent = platform_scoop_config->devs[0].dev;
@@ -284,3 +283,4 @@ module_exit(sharpsl_pcmcia_exit);
MODULE_DESCRIPTION("Sharp SL Series PCMCIA Support");
MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:pxa2xx-pcmcia");
diff --git a/drivers/rtc/rtc-ds1742.c b/drivers/rtc/rtc-ds1742.c
index b2e5481..f5af09a 100644
--- a/drivers/rtc/rtc-ds1742.c
+++ b/drivers/rtc/rtc-ds1742.c
@@ -273,3 +273,4 @@ MODULE_AUTHOR("Atsushi Nemoto <anemo@....ocn.ne.jp>");
MODULE_DESCRIPTION("Dallas DS1742 RTC driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);
+MODULE_ALIAS("platform:ds1742");
-
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