netdev - Re: [PATCH][ATM] iphase: BUG: sleeping function called from invalid context

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Sun, 15 Jun 2008 15:00:48 +0200
From:	"Jorge Boncompte [DTI2]" <jorge@...2.net>
To:	chas3@...rs.sourceforge.net
CC:	netdev@...r.kernel.org
Subject: Re: [PATCH][ATM] iphase: BUG: sleeping function called from invalid
 context

Chas Williams (CONTRACTOR) escribió:
> In message <4848106F.30503@...2.net>,"Jorge Boncompte [DTI2]" writes:
>> 	iphase driver calls ioremap under spinlock_irqsave in his
>> initialization function. The spinlock seems to be there just for the 
>> sole purpose of preventing initializing multiple cards at once. So I 
>> think that removing it should be fine.
> 
> the lock is necessary to prevent multiple cards from modifying iadev_count
> at the wrong time since iadev_count is incremented and decremented.
> it might be simpler to just make a local copy of iadev_count and just
> always increment iadev_count.  if you fail to init a particular card,
> you will just leave a hole in ia_dev[].  something like the attached.

	I thought that device initialization inside a driver is serialized. isn't it?

> also, ia_remove_one() is broken since it assumes that the cards will be
> removed in the same order that they were installed.
> 
> even better would be to rewrite this to avoid the iadev[] array entirely
> and use a linked list.
> 

	I have a patch that removes iadev and iadev_count enterely that i did not sent because i thought it wouldn't be 
considered a bug fix. I'll sent it this week.

	Thanks for your review,

	-Jorge
-- 
==============================================================
Jorge Boncompte - Ingenieria y Gestion de RED
DTI2 - Desarrollo de la Tecnologia de las Comunicaciones
--------------------------------------------------------------
C/ Abogado Enriquez Barrios, 5   14004 CORDOBA (SPAIN)
Tlf: +34 957 761395 / FAX: +34 957 450380
==============================================================
- Sin pistachos no hay Rock & Roll...
- Without wicker a basket cannot be made.
==============================================================

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html