lkml.org 
[lkml]   [2002]   [Feb]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH 2.5.3] wavelan_cs.c : new WE api
From
On Mon, Feb 04, 2002 at 09:36:18PM -0500, Jeff Garzik wrote:
> Comments pertaining to all three of wavelan, wavelan_cs, and netwave_cs:
> * wv_splhi should really just be spin_lock_irqsave. calling
> spin_lock_irqsave with 'flags' from another function is non-portable.
> doing so to an inline function is just barely portable, and is
> discouraged :)

We will have to agree to disagree. I won't oppose a patch (as
long as the driver still works after it).

> * I still see a couple save_flags/restore_flags in there...

Of course, I haven't removed them, just moved them around.

Old code (simplified) :
---------------------------
xxx_ioctl()
{
save_flags();
switch(cmd) {
[...]
copy_from_user(extra, ...);
outsb(..., extra);
[...]
}
restore_flags();
}
----------------------------
Alan told me that this is a no-no.

New code :
-----------------------
xxx_set_xxx(... , char *extra)
{
save_flags();
[...]
outsb(..., extra);
[...]
restore_flags();
}
-----------------------
copy_to/from_user is handled before reaching the wireless
handler. What is nice is that the new API *enforce* the proper
behaviour.

Actually, you may want to add that to the list of cleanups for
the kernel janitors, check that all copy_to/from_user in device ioctl
functions are not done with irq disabled. Actually, I think it was
mostly in Wireless drivers...

> otherwise looks ok to me.

Good. If I understood the new "official" procedure from Linus
himself, you are supposed to forward my patches to hin ;-)

> Jeff Garzik

Have fun...

Jean
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:23    [W:0.033 / U:7.768 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site