linux-kernel - Re: [linux-usb-devel] 2.6.20-rc6 pb

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Message-ID: <20070129102641.GC3375@master.mivlgu.local>
Date:	Mon, 29 Jan 2007 13:26:41 +0300
From:	Sergey Vlasov <vsu@...linux.ru>
To:	Jiri Kosina <jikos@...os.cz>
Cc:	Soeren Sonnenburg <kernel@....de>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	linux-usb-devel <linux-usb-devel@...ts.sourceforge.net>
Subject: Re: [linux-usb-devel] 2.6.20-rc6 pb_fnmode regression

On Mon, Jan 29, 2007 at 10:55:48AM +0100, Jiri Kosina wrote:
> Changing module parameter values through sysfs is not a very nice idea, 
> because the change of the value is indeed silent - the driver is not 
> notified in any way, that the value has changed. So the driver should take 
> care of it by itself, which is not a nice thing.

There is module_param_call() - used at least by drivers/md/md.c:

static int get_ro(char *buffer, struct kernel_param *kp)
...
static int set_ro(const char *val, struct kernel_param *kp)
...
module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);

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