From: Niklas Cassel <niklas.cassel@linaro.org>
To: Marc Zyngier <marc.zyngier@arm.com>
Cc: linux-pci@vger.kernel.org,
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
Bjorn Helgaas <bhelgaas@google.com>,
Trent Piepho <tpiepho@impinj.com>,
Jingoo Han <jingoohan1@gmail.com>,
Gustavo Pimentel <gustavo.pimentel@synopsys.com>,
faiz_abbas@ti.com, Joao Pinto <Joao.Pinto@synopsys.com>,
Vignesh R <vigneshr@ti.com>
Subject: Re: [2/3] PCI: designware: Take lock when ACKing an interrupt
Date: Mon, 3 Dec 2018 19:02:27 +0100 [thread overview]
Message-ID: <20181203180227.GB18985@centauri.lan> (raw)
In-Reply-To: <20181113225734.8026-3-marc.zyngier@arm.com>
On Tue, Nov 13, 2018 at 10:57:33PM +0000, Marc Zyngier wrote:
> Bizarrely, there is no lock taken in the irq_ack helper. This
> puts the ack callback provided by a specific platform in a awkward
> situation where there is no synchronization that would be expected
> on other callback.
>
> Introduce the required lock, giving some level of uniformity among
> callbacks.
>
> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
> ---
> drivers/pci/controller/dwc/pcie-designware-host.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
> index c3aa8b5fb51d..0a76948ed49e 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> @@ -202,11 +202,16 @@ static void dw_pci_bottom_ack(struct irq_data *d)
> {
> struct msi_desc *msi = irq_data_get_msi_desc(d);
> struct pcie_port *pp;
> + unsigned long flags;
>
> pp = msi_desc_to_pci_sysdata(msi);
>
> + raw_spin_lock_irqsave(&pp->lock, flags);
> +
> if (pp->ops->msi_irq_ack)
> pp->ops->msi_irq_ack(d->hwirq, pp);
> +
> + raw_spin_unlock_irqrestore(&pp->lock, flags);
> }
>
> static struct irq_chip dw_pci_msi_bottom_irq_chip = {
Tested-by: Niklas Cassel <niklas.cassel@linaro.org>
next prev parent reply other threads:[~2018-12-03 18:02 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-13 22:57 [PATCH 0/3] PCI: designware: Fixing MSI handling flow Marc Zyngier
2018-11-13 22:57 ` [PATCH 1/3] PCI: designware: Use interrupt masking instead of disabling Marc Zyngier
2018-12-03 18:02 ` [1/3] " Niklas Cassel
2018-12-04 9:41 ` [PATCH 1/3] " Gustavo Pimentel
2018-11-13 22:57 ` [PATCH 2/3] PCI: designware: Take lock when ACKing an interrupt Marc Zyngier
2018-11-14 19:08 ` Trent Piepho
2018-12-03 18:02 ` Niklas Cassel [this message]
2018-12-04 9:41 ` Gustavo Pimentel
2018-11-13 22:57 ` [PATCH 3/3] PCI: designware: Move interrupt acking into the proper callback Marc Zyngier
2018-11-14 19:01 ` Trent Piepho
2018-12-03 18:02 ` [3/3] " Niklas Cassel
2018-12-04 9:41 ` [PATCH 3/3] " Gustavo Pimentel
2018-12-04 10:20 ` Kishon Vijay Abraham I
2018-12-04 13:45 ` Marc Zyngier
2018-12-07 8:12 ` Kishon Vijay Abraham I
2018-12-07 9:45 ` Marc Zyngier
2018-12-07 10:13 ` Kishon Vijay Abraham I
2018-12-11 12:35 ` Lorenzo Pieralisi
2018-12-12 5:54 ` Kishon Vijay Abraham I
2018-11-13 23:16 ` [PATCH 0/3] PCI: designware: Fixing MSI handling flow Gustavo Pimentel
2018-11-14 9:54 ` Marc Zyngier
2018-11-14 19:19 ` Trent Piepho
2018-11-14 22:01 ` Marc Zyngier
2018-11-14 22:25 ` Trent Piepho
2018-11-14 22:44 ` Marc Zyngier
2018-11-14 23:23 ` Trent Piepho
2018-11-19 20:37 ` Trent Piepho
2018-11-22 12:03 ` Gustavo Pimentel
2018-11-22 16:07 ` Gustavo Pimentel
2018-11-22 16:26 ` Lorenzo Pieralisi
2018-11-22 16:38 ` Marc Zyngier
2018-11-22 17:40 ` Gustavo Pimentel
2018-11-26 16:06 ` Trent Piepho
2018-11-27 7:51 ` Marc Zyngier
2018-11-27 17:23 ` Trent Piepho
2018-11-22 17:49 ` Gustavo Pimentel
2018-11-26 15:52 ` Trent Piepho
2018-11-27 7:50 ` Marc Zyngier
2018-11-27 18:12 ` Trent Piepho
2018-12-07 16:16 ` Gustavo Pimentel
2018-11-14 18:28 ` Trent Piepho
2018-11-14 22:07 ` Marc Zyngier
2018-11-14 22:50 ` Trent Piepho
2018-11-15 15:22 ` Gustavo Pimentel
2018-11-15 18:37 ` Trent Piepho
2018-11-15 19:29 ` Marc Zyngier
2018-11-19 20:14 ` Trent Piepho
2018-11-21 17:24 ` Stanimir Varbanov
2018-12-01 23:50 ` Niklas Cassel
2018-12-02 11:28 ` Stanimir Varbanov
2018-12-03 10:42 ` Lorenzo Pieralisi
2018-12-03 13:09 ` Niklas Cassel
2018-12-03 17:42 ` Lorenzo Pieralisi
2018-12-03 20:31 ` Trent Piepho
2018-12-10 16:17 ` Lorenzo Pieralisi
2018-12-10 16:30 ` Marc Zyngier
2018-12-10 18:15 ` Trent Piepho
2018-12-10 18:31 ` Marc Zyngier
2018-12-10 20:34 ` Trent Piepho
2018-12-12 9:10 ` Gustavo Pimentel
2018-12-12 8:55 ` Gustavo Pimentel
2018-12-11 11:43 ` Lorenzo Pieralisi
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