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

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Date:   Fri, 27 Sep 2019 11:45:55 +0200
From:   Thomas Petazzoni <thomas.petazzoni@...tlin.com>
To:     Remi Pommarel <repk@...plefau.lt>
Cc:     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, 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>

Thanks!

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