From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Pavel Machek <pavel@suse.cz>
Cc: Jesse Barnes <jbarnes@engr.sgi.com>,
linux-pci@atrey.karlin.mff.cuni.cz,
Matthew Wilcox <matthew@wil.cx>,
Linus Torvalds <torvalds@osdl.org>,
Jeff Garzik <jgarzik@pobox.com>,
Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>,
Linux Kernel list <linux-kernel@vger.kernel.org>,
linux-ia64@vger.kernel.org, Linas Vepstas <linas@austin.ibm.com>,
"Luck, Tony" <tony.luck@intel.com>
Subject: Re: [PATCH/RFC] I/O-check interface for driver's error handling
Date: Sat, 05 Mar 2005 10:03:37 +1100 [thread overview]
Message-ID: <1109977417.5611.318.camel@gaston> (raw)
In-Reply-To: <20050304225710.GB2647@elf.ucw.cz>
On Fri, 2005-03-04 at 23:57 +0100, Pavel Machek wrote:
> What prevents driver from being run on another CPU, maybe just doing
> mdelay() between hardware accesses?
Almost all drivers that I know have some sort of locking. Nothing nasty
about it. Besides, you can't expect everything to be as simple as
putting two bit of lego together, the problem isn't simple.
If an IOs gets there out of sync, it's a non-issue, it will most
probably just return all 1's, and if using Seto proposed functions, the
bit of code doing it will "know" there was an error and will stop.
But a driver notified of errors that, typically, triggered a slot
isolation like on pSeries, will have to wait for all IOs to complete
anyway, stop everything, so that the slot can be reset.
I think you are raising a non-issue.
Ben.
next prev parent reply other threads:[~2005-03-05 5:50 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-01 8:33 [PATCH/RFC] I/O-check interface for driver's error handling Hidetoshi Seto
2005-03-01 14:42 ` Matthew Wilcox
2005-03-01 19:27 ` Linas Vepstas
2005-03-01 19:37 ` Linus Torvalds
2005-03-02 6:13 ` Hidetoshi Seto
2005-03-02 19:20 ` Linas Vepstas
2005-03-04 2:03 ` Hidetoshi Seto
2005-03-04 16:46 ` Linas Vepstas
2005-03-01 16:37 ` Jeff Garzik
2005-03-01 16:49 ` Linus Torvalds
2005-03-01 16:59 ` Matthew Wilcox
2005-03-01 17:10 ` Jesse Barnes
2005-03-01 18:33 ` Linas Vepstas
2005-03-01 22:27 ` Benjamin Herrenschmidt
2005-03-02 20:02 ` Linas Vepstas
2005-03-02 22:46 ` Benjamin Herrenschmidt
2005-03-02 23:37 ` Linas Vepstas
2005-03-01 22:23 ` Benjamin Herrenschmidt
2005-03-02 3:13 ` Hidetoshi Seto
2005-03-04 13:54 ` Pavel Machek
2005-03-04 17:50 ` Jesse Barnes
2005-03-04 22:37 ` Benjamin Herrenschmidt
2005-03-04 22:57 ` Pavel Machek
2005-03-04 23:03 ` Benjamin Herrenschmidt [this message]
2005-03-04 23:18 ` Pavel Machek
2005-03-04 23:27 ` Benjamin Herrenschmidt
2005-03-02 2:28 ` Hidetoshi Seto
2005-03-02 17:44 ` Linas Vepstas
2005-03-02 18:03 ` linux-os
2005-03-02 22:40 ` Benjamin Herrenschmidt
2005-03-04 2:21 ` Hidetoshi Seto
2005-03-01 22:20 ` Benjamin Herrenschmidt
2005-03-02 18:22 ` Linas Vepstas
2005-03-02 18:41 ` Jesse Barnes
2005-03-02 19:46 ` Linas Vepstas
2005-03-02 22:43 ` Benjamin Herrenschmidt
2005-03-02 22:41 ` Benjamin Herrenschmidt
2005-03-02 23:30 ` Linas Vepstas
2005-03-02 23:40 ` Jesse Barnes
2005-03-01 19:17 ` Linas Vepstas
2005-03-01 22:15 ` Benjamin Herrenschmidt
2005-03-01 17:19 ` Andi Kleen
2005-03-01 18:08 ` Linus Torvalds
2005-03-01 18:45 ` Andi Kleen
2005-03-01 18:59 ` Linas Vepstas
2005-03-01 22:26 ` Benjamin Herrenschmidt
2005-03-01 22:24 ` Benjamin Herrenschmidt
2005-03-04 12:40 ` Hidetoshi Seto
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