linux-kernel - [PATCH] ahci: add a boot option to enable promise ahci

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Message-ID: <1AF0FA078A5A3541A8A8019D26081C2E88DCE6D976@ptt-ex02.promise.com.tw>
Date:	Mon, 24 Sep 2012 10:34:11 +0800
From:	Tony Hung - PTT 洪瑞嶸 
	<tony.hung@...promise.com>
To:	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] ahci: add a boot option to enable promise ahci

linux-3.2.0/drivers/ata/ahci.c: In function 'hptiop_host_request_callback':

Use min_t(size_t, ...) to fix.

Signed-off-by: Tony Hung <tony.hung@...promise.com>
---

diff --git a/linux-3.2.0/drivers/ata/ahci.c b/linux-3.2.0/drivers/ata/ahci.c
--- a/linux-3.2.0/drivers/ata/ahci.c	2012-08-29 13:40:26.046851693 +0800
+++ b/linux-3.2.0/drivers/ata/ahci.c	2012-08-30 17:23:10.207838960 +0800
@@ -430,6 +430,9 @@ static int marvell_enable = 1;
 module_param(marvell_enable, int, 0644);
 MODULE_PARM_DESC(marvell_enable, "Marvell SATA via AHCI (1 = enabled)");

+static int promise_enable;
+module_param(promise_enable, int, 0644);
+MODULE_PARM_DESC(promise_enable, "Promise SATA via AHCI (1 = enabled)");

 static void ahci_pci_save_initial_config(struct pci_dev *pdev,
 					 struct ahci_host_priv *hpriv)
@@ -1049,6 +1052,16 @@ static int ahci_init_one(struct pci_dev
 	if (pdev->vendor == PCI_VENDOR_ID_MARVELL && !marvell_enable)
 		return -ENODEV;

+        /*
+         * In RAID mode, Promise software RAID need to replace
+         * original AHCI module, but if AHCI driver build-in kernel,
+         * Promise AHCI module need a boot option to disable it
+         */
+        if (promise_enable &&
+            ((pdev->class >> 8) == PCI_CLASS_STORAGE_RAID) &&
+             (pdev->vendor == PCI_VENDOR_ID_ATI ||
+              pdev->vendor == PCI_VENDOR_ID_AMD))
+                return -ENODEV;
+
 	/*
 	 * For some reason, MCP89 on MacBook 7,1 doesn't work with
 	 * ahci, use ata_generic instead. 

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