linux-kernel - Re: [RFT v3] eata: Convert eata driver as normal PCI and platform device drivers

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Date:	Tue, 22 Sep 2015 22:27:28 +0200
From:	Hannes Reinecke <hare@...e.de>
To:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Arthur Marsh <arthur.marsh@...ernode.on.net>,
	Ballabio Dario <dario.ballabio@....com>,
	Christoph Hellwig <hch@...radead.org>,
	Dario Ballabio <ballabio_dario@....com>,
	"James E.J. Bottomley" <JBottomley@...n.com>
Cc:	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-scsi@...r.kernel.org, x86@...nel.org
Subject: Re: [RFT v3] eata: Convert eata driver as normal PCI and platform
 device drivers

On 09/22/2015 09:30 AM, Jiang Liu wrote:
> Previously the eata driver just grabs and accesses eata PCI devices
> without implementing a PCI device driver, that causes troubles with
> latest IRQ related
> 
> Commit 991de2e59090 ("PCI, x86: Implement pcibios_alloc_irq() and
> pcibios_free_irq()") changes the way to allocate PCI legacy IRQ
> for PCI devices on x86 platforms. Instead of allocating PCI legacy
> IRQs when pcibios_enable_device() gets called, now pcibios_alloc_irq()
> will be called by pci_device_probe() to allocate PCI legacy IRQs
> when binding PCI drivers to PCI devices.
> 
> But the eata driver directly accesses PCI devices without implementing
> corresponding PCI drivers, so pcibios_alloc_irq() won't be called for
> those PCI devices and wrong IRQ number may be used to manage the PCI
> device.
> 
> This patch implements a PCI device driver to manage eata PCI devices,
> so eata driver could properly cooperate with the PCI core. It also
> provides headroom for PCI hotplug with eata driver.
> 
> It also represents non-PCI eata devices as platform devices, so it could
> be managed as normal devices.
> 
> Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
> Cc: Hannes Reinecke <hare@...e.de>
> Cc: Ballabio, Dario <dario.ballabio@....com>
> Cc: Christoph Hellwig <hch@...radead.org>
Reviewed-by: Hannes Reinecke <hare@...e.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
hare@...e.de			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: J. Hawn, J. Guild, F. Imendörffer, HRB 16746 (AG Nürnberg)
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