Re: 2.6.12-rc3-mm3: ALSA broken ?

["J.A. Magallon" <jamagallon@able.es>]

On 05.27, Takashi Iwai wrote:
> At Thu, 26 May 2005 23:51:58 +0000,
> J.A. Magallon wrote:
> 
> > A side note. In the process of solving all this, I tried to generate a patch
> > for 1.0.9rc4a against -mm. I noticed some things:
> > - Your code reverts some in-kernel changes related to
> >     if (ptr)
> >         kfree(ptr)
> >   The if is killed in mainline, as kfree accepts null pointers.
> 
> Could you point which places?
> 

Oops, I think this is not ALSA specific code.
I took the directory alsa-kernel, in the alsa tarball, and diffed against
2.6.12-rc5-mm1:

--- /usr/src/linux-2.6.12-rc5-mm1/sound/core/seq/oss/seq_oss_synth.c    2005-05-27 00:25:37.000000000 +0200
+++ alsa-kernel/core/seq/oss/seq_oss_synth.c    2005-01-20 18:42:37.000000000 +0100
@@ -325,10 +325,14 @@
            }
            snd_use_lock_free(&rec->use_lock);
        }
-       kfree(info->sysex);
-       info->sysex = NULL;
-       kfree(info->ch);
-       info->ch = NULL;
+       if (info->sysex) {
+           kfree(info->sysex);
+           info->sysex = NULL;
+       }
+       if (info->ch) {
+           kfree(info->ch);
+           info->ch = NULL;
+       }
    }
    dp->synth_opened = 0;
    dp->max_synthdev = 0;
@@ -414,10 +418,14 @@
                      dp->file_mode) < 0) {
            midi_synth_dev.opened--;
            info->opened = 0;
-           kfree(info->sysex);
-           info->sysex = NULL;
-           kfree(info->ch);
-           info->ch = NULL;
+           if (info->sysex) {
+               kfree(info->sysex);
+               info->sysex = NULL;
+           }
+           if (info->ch) {
+               kfree(info->ch);
+               info->ch = NULL;
+           }
        }
        return;
    }

This looks like OSS code. Why does the tarball include OSS code ?
Which is the correct way to generate a patch against a kernel tree ?

--
J.A. Magallon <jamagallon()able!es>     \               Software is like sex:
werewolf!able!es                         \         It's better when it's free
Mandriva Linux release 2006.0 (Cooker) for i586
Linux 2.6.11-jam20 (gcc 4.0.0 (4.0.0-3mdk for Mandriva Linux release 2006.0))