Hi Robert,
El Tue, Apr 01, 2008 at 08:28:23AM -0400 Robert P. J. Day ha dit:
> On Tue, 1 Apr 2008, Matthias Kaehlcke wrote:
>
> > they can't arrive at the second test simultaneously cause cdev_lock
> > is used for synchronization.
> >
> > yes, they would set it to the same value, but two calls t
On Tue, 1 Apr 2008, Matthias Kaehlcke wrote:
> they can't arrive at the second test simultaneously cause cdev_lock
> is used for synchronization.
>
> yes, they would set it to the same value, but two calls to
> list_add(&inode->i_devices, &p->list) would result in
> inode->i_devices being added tw
El Tue, Apr 01, 2008 at 07:38:05AM -0400 Robert P. J. Day ha dit:
>
> regarding the routine "chrdev_open()" in fs/char_dev.c:
>
> On Tue, 1 Apr 2008, Matthias Kaehlcke wrote:
>
> > El Mon, Mar 31, 2008 at 10:10:41PM -0400 Robert P. J. Day ha dit:
>
> > > p.s. i am a bit confused as to why the
On Tue, 1 Apr 2008, Matthias Kaehlcke wrote:
> El Tue, Apr 01, 2008 at 07:38:05AM -0400 Robert P. J. Day ha dit:
>
> >
> > regarding the routine "chrdev_open()" in fs/char_dev.c:
> >
> > On Tue, 1 Apr 2008, Matthias Kaehlcke wrote:
> >
> > > El Mon, Mar 31, 2008 at 10:10:41PM -0400 Robert P. J. Da
El Mon, Mar 31, 2008 at 10:10:41PM -0400 Robert P. J. Day ha dit:
>
> (a bit involved so bear with me, i really want to figure out how
> this works.)
>
> i'm following the sample code in the LDD3 book for the "scull"
> driver, and i *think* i know the answer to this but i just want to
> make
regarding the routine "chrdev_open()" in fs/char_dev.c:
On Tue, 1 Apr 2008, Matthias Kaehlcke wrote:
> El Mon, Mar 31, 2008 at 10:10:41PM -0400 Robert P. J. Day ha dit:
> > p.s. i am a bit confused as to why there are two tests for whether
> > inode->i_cdev is non-NULL:
> >
> > p = ino
(a bit involved so bear with me, i really want to figure out how
this works.)
i'm following the sample code in the LDD3 book for the "scull"
driver, and i *think* i know the answer to this but i just want to
make sure. it has to do with how defining a new character device and
opening it mana
