linux-kernel - Re: [PATCH v3] PCI: aardvark: Don't rely on jiffies while holding spinlock

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Message-ID: <20190930144958.GA42880@e119886-lin.cambridge.arm.com>
Date:   Mon, 30 Sep 2019 15:49:59 +0100
From:   Andrew Murray <andrew.murray@....com>
To:     Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Cc:     Remi Pommarel <repk@...plefau.lt>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] PCI: aardvark: Don't rely on jiffies while holding
 spinlock

On Fri, Sep 27, 2019 at 11:45:55AM +0200, Thomas Petazzoni wrote:
> On Fri, 27 Sep 2019 10:55:02 +0200
> Remi Pommarel <repk@...plefau.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@...plefau.lt>
> 
> Acked-by: Thomas Petazzoni <thomas.petazzoni@...tlin.com>
> 

Reviewed-by: Andrew Murray <andrew.murray@....com>

> Thanks!
> 
> Thomas
> -- 
> Thomas Petazzoni, CTO, Bootlin
> Embedded Linux and Kernel engineering
> https://bootlin.com