linux-kernel - [PATCH v2 0/3] pstore: add pstore unregister

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Date:	Sun, 18 Oct 2015 18:49:22 +0800
From:	Geliang Tang <geliangtang@....com>
To:	Anton Vorontsov <anton@...msg.org>,
	Colin Cross <ccross@...roid.com>,
	Kees Cook <keescook@...omium.org>,
	Tony Luck <tony.luck@...el.com>
Cc:	Geliang Tang <geliangtang@....com>, linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/3] pstore: add pstore unregister

On Fri, Oct 16, 2015 at 08:50:42AM -0700, Kees Cook wrote:
> On Fri, Oct 16, 2015 at 8:25 AM, Geliang Tang <geliangtang@....com> wrote:
> > +static struct dentry *dir;
> 
> Since this is no longer a local, it should probably be renamed
> something more descriptive.
> 

I renamed it pstore_ftrace_dir.

> > +static void free_buf_for_compression(void)
> > +{
> > +       kfree(stream.workspace);
> > +       kfree(big_oops_buf);
> 
> I think both of these should be set to NULL after their kfrees.
> 

I did it as you suggested.

> >  static void pstore_register_console(void)
> >  {
> > +       pstore_console.flags = CON_PRINTBUFFER | CON_ENABLED | CON_ANYTIME;
> 
> Why do these flags need to move here?
> 

No need to deal these console flags here specifically. I drop it.

> > -       if (owner && !try_module_get(owner)) {
> > -               psinfo = NULL;
> > -               return -EINVAL;
> > -       }
> 
> Don't we still need to hold a module reference?
> 

Yes. I simply add module_put in pstore_register() to deal with it. 
Maybe it's not good enough. Please give me some advices.

Thanks.

Geliang Tang (3):
  pstore: add vmalloc error check
  pstore: add a helper function pstore_register_kmsg
  pstore: add pstore unregister

 fs/pstore/Kconfig      |  2 +-
 fs/pstore/Makefile     |  6 +++---
 fs/pstore/ftrace.c     | 23 ++++++++++++++++++-----
 fs/pstore/inode.c      |  7 +++++++
 fs/pstore/internal.h   |  4 ++++
 fs/pstore/platform.c   | 42 +++++++++++++++++++++++++++++++++++++++++-
 fs/pstore/pmsg.c       |  9 +++++++++
 fs/pstore/ram.c        | 17 +++++++----------
 include/linux/pstore.h | 14 +-------------
 kernel/printk/printk.c |  1 +
 10 files changed, 92 insertions(+), 33 deletions(-)

-- 
2.5.0


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