From: gregkh@linuxfoundation•org (Greg Kroah-Hartman)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH] serial/amba-pl011: Disable interrupts around TX softirq
Date: Fri, 12 Jun 2015 17:39:45 -0700 [thread overview]
Message-ID: <20150613003945.GA10941@kroah.com> (raw)
In-Reply-To: <1433513267-24163-1-git-send-email-Dave.Martin@arm.com>
On Fri, Jun 05, 2015 at 03:07:47PM +0100, Dave Martin wrote:
> pl011_tx_softirq() currently uses spin_{,un}lock(), which are not
> sufficient to inhibit pl011_int() from being triggered by a local
> IRQ and trying to re-take the same lock. This can lead to
> deadlocks.
>
> This patch uses the _irq() locking variants instead to ensure that
> pl011_int() handling for a given port is deferred until any
> pl011_tx_softirq() work for that port is complete.
>
> Signed-off-by: Dave Martin <Dave.Martin@arm•com>
> Tested-by: Robin Murphy <robin.murphy@arm•com>
> Cc: stable <stable@vger•kernel.org> # 4.1
> ---
>
> Another candidate for v4.1 if possible (sorry!) -- I thought this change
> was already in, but it went astray when I was refactoring.
Too late for 4.1, sorry. This doesn't apply to my tty-next branch,
otherwise I would have queued it up there. Care to redo it and mark it
for -stable, like I did above, and resend it?
thanks,
greg k-h
next prev parent reply other threads:[~2015-06-13 0:39 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-05 14:07 [PATCH] serial/amba-pl011: Disable interrupts around TX softirq Dave Martin
2015-06-05 18:03 ` Robin Murphy
2015-06-08 10:34 ` Robin Murphy
2015-06-08 11:34 ` Dave P Martin
2015-06-13 0:39 ` Greg Kroah-Hartman [this message]
2015-06-15 10:53 ` Dave P Martin
2015-06-15 11:09 ` Andre Przywara
2015-06-15 14:03 ` Dave Martin
-- strict thread matches above, loose matches on Subject: below --
2015-06-18 13:54 Dave Martin
2015-06-20 9:09 ` Stefan Wahren
2015-06-23 11:13 ` Dave P Martin
2015-07-09 10:57 Dave Martin
2015-07-23 22:05 ` Greg Kroah-Hartman
2015-07-24 9:56 ` Dave Martin
2015-07-24 15:15 ` Greg Kroah-Hartman
2015-07-24 16:46 ` Dave Martin
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