From: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
To: Remi Pommarel <repk@triplefau.lt>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
Bjorn Helgaas <bhelgaas@google.com>,
linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3] PCI: aardvark: Don't rely on jiffies while holding spinlock
Date: Fri, 27 Sep 2019 11:45:55 +0200 [thread overview]
Message-ID: <20190927114555.193a9d68@windsurf> (raw)
In-Reply-To: <20190927085502.1758-1-repk@triplefau.lt>
On Fri, 27 Sep 2019 10:55:02 +0200
Remi Pommarel <repk@triplefau.lt> wrote:
> advk_pcie_wait_pio() can be called while holding a spinlock (from
> pci_bus_read_config_dword()), then depends on jiffies in order to
> timeout while polling on PIO state registers. In the case the PIO
> transaction failed, the timeout will never happen and will also cause
> the cpu to stall.
>
> This decrements a variable and wait instead of using jiffies.
>
> Signed-off-by: Remi Pommarel <repk@triplefau.lt>
Acked-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Thanks!
Thomas
--
Thomas Petazzoni, CTO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
next prev parent reply other threads:[~2019-09-27 9:45 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-27 8:55 [PATCH v3] PCI: aardvark: Don't rely on jiffies while holding spinlock Remi Pommarel
2019-09-27 9:45 ` Thomas Petazzoni [this message]
2019-09-30 14:49 ` Andrew Murray
2019-10-15 11:16 ` Lorenzo Pieralisi
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