linux-kernel - [PATCH 2/2] cciss: change to discover first memory BAR

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Date:	Thu, 5 Mar 2009 17:34:20 -0600
From:	Mike Miller <mike.miller@...com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <jens.axboe@...cle.com>, coldwell@...hat.com
Cc:	LKML <linux-kernel@...r.kernel.org>,
	LKML-scsi <linux-scsi@...r.kernel.org>
Subject: [PATCH 2/2] cciss: change to discover first memory BAR

PATCH 2 of 2

This patch adds a method for discovering the first memory BAR. All Smart
Array controllers to date have always had the the memory BAR as the first
BAR. A new controller to be released later this year breaks that model.

Please consider this for inclusion.

Signed-off-by: Mike Miller <mike.miller@...com>


diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index e189abd..311b81e 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -3245,12 +3245,21 @@ static int __devinit cciss_pci_init(ctlr_info_t *c, struct pci_dev *pdev)
  */
 	cciss_interrupt_mode(c, pdev, board_id);
 
-	/*
-	 * Memory base addr is first addr , the second points to the config
-	 *   table
-	 */
+	/* find the memory BAR */
+	for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
+		if (pci_resource_flags(pdev, i) & IORESOURCE_MEM)
+			break;
+	}
+	if (i == DEVICE_COUNT_RESOURCE) {
+		printk(KERN_WARNING "cciss: No memory BAR found\n");
+		err = -ENODEV;
+		goto err_out_free_res;
+	}
+
+	c->paddr = pci_resource_start(pdev, i); /* addressing mode bits
+						 * already removed
+						 */
 
-	c->paddr = pci_resource_start(pdev, 0);	/* addressing mode bits already removed */
 #ifdef CCISS_DEBUG
 	printk("address 0 = %lx\n", c->paddr);
 #endif				/* CCISS_DEBUG */
--
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