linux-kernel - Re: udev 182: response timeout for request_firmware in module

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:	Thu, 23 Aug 2012 17:46:13 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Ming Lei <tom.leiming@...il.com>
Cc:	Kay Sievers <kay@...y.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Johannes Berg <johannes@...solutions.net>,
	Larry Finger <Larry.Finger@...inger.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	systemd-devel@...ts.freedesktop.org
Subject: Re: udev 182: response timeout for request_firmware in module_probe
 path

> IMO, the driver probing path is allowed to sleep, so looks request firmware
> should be allowed inside .probe().

I'm not convinced about that. It can sleep but its holding various locks
in most cases, and it looks like that can end up in a complete heap.

By all means *request* the firmware asynchronously in the probe, but
there needs to be a seperate method somewhere after the probe to finish
the job once the firmware appears.

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