On Tue, Feb 23, 2016 at 02:35:14PM +0800, Huang, Ying wrote:
> Linus Walleij <linus.wall...@linaro.org> writes:
>
> > On Mon, Feb 15, 2016 at 3:39 AM, Huang, Ying <ying.hu...@intel.com> wrote:
> >> Michael Welling <mwell...@ieee.org> writes:
> >
> >>> Could you run cat /proc/devices?
> >>
> >> Sorry, the test mechanism is not flexible enough to run some shell
> >> command in test system. Could you provide a specialized debug kernel to
> >> dump the necessary information in kernel log? We can collect dmesg
> >> easily.
> >
> > Can you try this:
> >
> > diff --git a/fs/char_dev.c b/fs/char_dev.c
> > index 24b142569ca9..74a2d433273e 100644
> > --- a/fs/char_dev.c
> > +++ b/fs/char_dev.c
> > @@ -96,6 +96,8 @@ __register_chrdev_region(unsigned int major,
> > unsigned int baseminor,
> > goto out;
> > }
> > major = i;
> > + pr_info("CHARDEV: allocate major %d for \"%s\"\n",
> > + i, name);
> > }
> >
> > cd->major = major;
> >
> > Then dmesg |grep CHARDEV should tell what we need to know.
>
> Sorry for late, the dmesg with the patch is attached. And the output of
> dmesg | grep CHARDEV is as follow:
>
> [ 0.750037] CHARDEV: allocate major 254 for "gpiochip"
> [ 0.897928] CHARDEV: allocate major 253 for "tpm"
> [ 0.904196] CHARDEV: allocate major 252 for "ndctl"
> [ 0.905295] CHARDEV: allocate major 251 for "dimmctl"
> [ 0.909573] CHARDEV: allocate major 250 for "pps"
> [ 0.913740] CHARDEV: allocate major 249 for "ptp"
> [ 0.916711] CHARDEV: allocate major 248 for "iio"
> [ 1.227597] CHARDEV: allocate major 247 for "bsg"
> [ 1.577194] CHARDEV: allocate major 246 for "gsmtty"
> [ 1.614921] CHARDEV: allocate major 245 for "ttyn"
> [ 1.616044] CHARDEV: allocate major 244 for "ttyARC"
> [ 1.617177] CHARDEV: allocate major 243 for "ttyRP"
> [ 1.618310] CHARDEV: allocate major 242 for "ttyLP"
> [ 1.620618] CHARDEV: allocate major 241 for "noz"
> [ 1.621707] CHARDEV: allocate major 240 for "ttyIPWp"
> [ 1.630024] CHARDEV: allocate major 239 for "telco_clock"
> [ 1.632315] CHARDEV: allocate major 239 for "cmm"
> [ 1.681375] CHARDEV: allocate major 238 for "hpilo"
> [ 1.696757] CHARDEV: allocate major 237 for "aac"
> [ 1.699338] CHARDEV: allocate major 236 for "megadev_legacy"
> [ 1.704680] CHARDEV: allocate major 235 for "megaraid_sas_ioctl"
> [ 1.731179] CHARDEV: allocate major 234 for "pmcsas"
Not sure how this is the first time this problem has come up.
There is an obvious overlap here into the statically allocated region.
> [ 1.737520] CHARDEV: allocate major 233 for "nvme"
> [ 2.388531] CHARDEV: allocate major 232 for "firewire"
> [ 2.389743] CHARDEV: allocate major 231 for "uio"
> [ 2.904429] CHARDEV: allocate major 230 for "ttySDIO"
> [ 2.922374] CHARDEV: allocate major 229 for "ib_qib"
> [ 2.927559] CHARDEV: allocate major 228 for "hidraw"
> [ 2.952328] CHARDEV: allocate major 227 for "fwtty"
> [ 2.953435] CHARDEV: allocate major 225 for "fwloop"
>
> Best Regards,
> Huang, Ying
