linux-kernel - Re: [PATCH v3] [SCSI] mpt2sas, mpt3sas: Abort initialization if no memory I/O resources detected

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Message-ID: <CAE9FiQXtxWHr0j5zFeAS2LxjqwMfecP_aeQDh93CUni+GbQxWw@mail.gmail.com>
Date:	Wed, 15 Jul 2015 11:28:41 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Timothy Pearson <tpearson@...torengineeringinc.com>
Cc:	Sreekanth Reddy <sreekanth.reddy@...gotech.com>,
	James Bottomley <jejb@...nel.org>, martin.petersen@...cle.com,
	Linux-Scsi <linux-scsi@...r.kernel.org>,
	"James E.J. Bottomley" <JBottomley@...allels.com>,
	Sathya.Prakash@...gotech.com,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Christoph Hellwig <hch@...radead.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
Subject: Re: [PATCH v3] [SCSI] mpt2sas, mpt3sas: Abort initialization if no
 memory I/O resources detected

On Wed, Jul 15, 2015 at 6:52 AM, Timothy Pearson
<tpearson@...torengineeringinc.com> wrote:
>> I have just kept the same description provide by Timothy in his
>> initial patch.
>>
>> But I observe that their may be chance of getting "unable to handle
>> kernel NULL pointer dereference" kernel panic if no Memory Resource
>> available in the PCI subsystem. So agreed to the Timothy proposal of
>> aborting the driver initialization if it doesn't detect any Memory
>> resource instead of whole system get into panic state.
>>
> On some systems Linux is unable / unwilling to assign a BAR if the BIOS
> does not assign one at startup.  I didn't look into the Linux allocator
> side of things in much detail, but it is quite possible that Linux is
> unaware the device only has partial resources assigned.
>

Would be great if you can post boot log so we can figure about why those
BARs are not assigned.

Yinghai
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