linux-kernel - [02/74] [SCSI] mptsas: Fix issue with chain pools allocation on katmai

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Date:	Thu, 04 Feb 2010 09:11:33 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Anatolij Gustschin <agust@...x.de>,
	Kashyap Desai <kashyap.desai@....com>,
	James Bottomley <James.Bottomley@...e.de>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [02/74] [SCSI] mptsas: Fix issue with chain pools allocation on katmai

2.6.32-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Anatolij Gustschin <agust@...x.de>

commit f1053a7ca9ce095d95bcc1cf41684c5e4f3e7751 upstream.

Since commit 9d2e9d66a3f032667934144cd61c396ba49f090d
mptsas driver fails to allocate memory for the MPT chain buffers
for second LSI adapter on PPC440SPe Katmai platform:
...
ioc1: LSISAS1068E B3: Capabilities={Initiator}
mptbase: ioc1: ERROR - Unable to allocate Reply, Request, Chain Buffers!
mptbase: ioc1: ERROR - didn't initialize properly! (-3)
mptsas: probe of 0002:31:00.0 failed with error -3

This commit increased MPT_FC_CAN_QUEUE value but initChainBuffers()
doesn't differentiate between SAS and FC causing increased allocation
for SAS case, too. Later pci_alloc_consistent() fails to allocate
increased chain buffer pool size for SAS case.

Provide a fix by looking at the bus type and using appropriate
MPT_SAS_CAN_QUEUE value while calculation of the number of chain
buffers.

Signed-off-by: Anatolij Gustschin <agust@...x.de>
Acked-by: Kashyap Desai <kashyap.desai@....com>
Signed-off-by: James Bottomley <James.Bottomley@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/message/fusion/mptbase.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/message/fusion/mptbase.c
+++ b/drivers/message/fusion/mptbase.c
@@ -4330,6 +4330,8 @@ initChainBuffers(MPT_ADAPTER *ioc)

 	if (ioc->bus_type == SPI)
 		num_chain *= MPT_SCSI_CAN_QUEUE;
+	else if (ioc->bus_type == SAS)
+		num_chain *= MPT_SAS_CAN_QUEUE;
 	else
 		num_chain *= MPT_FC_CAN_QUEUE;

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