From: Amir Vadai <amirv@mellanox.com>
To: David Decotigny <decot@googlers.com>
Cc: <linux-kernel@vger.kernel.org>,
Ben Hutchings <bhutchings@solarflare.com>,
"David S. Miller" <davem@davemloft.net>,
Or Gerlitz <ogerlitz@mellanox.com>,
"Paul E. McKenney" <paul.mckenney@linaro.org>,
Thomas Gleixner <tglx@linutronix.de>,
Andrew Morton <akpm@linux-foundation.org>,
"Josh Triplett" <josh@joshtriplett.org>,
David Howells <dhowells@redhat.com>,
"Paul Gortmaker" <paul.gortmaker@windriver.com>
Subject: Re: [PATCH v4] lib: cpu_rmap: avoid flushing all workqueues
Date: Mon, 7 Jan 2013 15:01:22 +0200 [thread overview]
Message-ID: <50EAC722.9050203@mellanox.com> (raw)
In-Reply-To: <bb2493cb7d0b36f35282d77c1f07727601f9c751.1357163124.git.decot@googlers.com>
On 02/01/2013 23:52, David Decotigny wrote:
> In some cases, free_irq_cpu_rmap() is called while holding a lock
> (eg. rtnl). This can lead to deadlocks, because it invokes
> flush_scheduled_work() which ends up waiting for whole system
> workqueue to flush, but some pending works might try to acquire the
> lock we are already holding.
>
> This commit uses reference-counting to replace
> irq_run_affinity_notifiers(). It also removes
> irq_run_affinity_notifiers() altogether.
>
> Signed-off-by: David Decotigny<decot@googlers.com>
> ---
> include/linux/cpu_rmap.h | 13 +++-------
> include/linux/interrupt.h | 5 ----
> lib/cpu_rmap.c | 63 +++++++++++++++++++++++++++++++++++++++++----
> 3 files changed, 62 insertions(+), 19 deletions(-)
>
Acked-by: Amir Vadai <amirv@mellanox.com>
prev parent reply other threads:[~2013-01-07 13:01 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <cover.1357163124.git.decot@googlers.com>
2013-01-02 21:52 ` [PATCH v4] lib: cpu_rmap: avoid flushing all workqueues David Decotigny
2013-01-02 21:54 ` Ben Hutchings
2013-01-02 22:05 ` Eric Dumazet
2013-01-02 22:20 ` Josh Triplett
2013-01-02 23:12 ` Andrew Morton
2013-01-02 23:46 ` Ben Hutchings
2013-01-03 21:58 ` Andrew Morton
2013-01-08 16:05 ` Ben Hutchings
2013-01-03 2:35 ` David Decotigny
2013-01-03 21:47 ` Andrew Morton
2013-01-03 22:26 ` Ben Hutchings
2013-01-07 13:00 ` Amir Vadai
2013-01-07 13:01 ` Amir Vadai [this message]
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