From: adam radford <aradford@gmail.com>
Date: Fri, 25 Feb 2011 04:56:28 +0000 (-0800)
Subject: [SCSI] megaraid_sas: Fix probe_one to clear MSI-X flags in kdump
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=66192dfe1e74eae31a76cfc36092dabdba1324e6;p=mv-sheeva.git

[SCSI] megaraid_sas: Fix probe_one to clear MSI-X flags in kdump

The following patch for megaraid_sas fixes megasas_probe_one() to
clear MSI-X flags in kdump when the 'reset_devices' kernel parameter
is passed in.

Signed-off-by: Adam Radford <aradford@gmail.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
---

diff --git a/drivers/scsi/megaraid/megaraid_sas.h b/drivers/scsi/megaraid/megaraid_sas.h
index 1b5e375732c..e00ee4afdbc 100644
--- a/drivers/scsi/megaraid/megaraid_sas.h
+++ b/drivers/scsi/megaraid/megaraid_sas.h
@@ -1477,4 +1477,7 @@ struct megasas_mgmt_info {
 	int max_index;
 };
 
+#define msi_control_reg(base) (base + PCI_MSI_FLAGS)
+#define PCI_MSIX_FLAGS_ENABLE (1 << 15)
+
 #endif				/*LSI_MEGARAID_SAS_H */
diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index 050ec1694e6..a521e1afd73 100644
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -3901,9 +3901,26 @@ fail_set_dma_mask:
 static int __devinit
 megasas_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
 {
-	int rval;
+	int rval, pos;
 	struct Scsi_Host *host;
 	struct megasas_instance *instance;
+	u16 control = 0;
+
+	/* Reset MSI-X in the kdump kernel */
+	if (reset_devices) {
+		pos = pci_find_capability(pdev, PCI_CAP_ID_MSIX);
+		if (pos) {
+			pci_read_config_word(pdev, msi_control_reg(pos),
+					     &control);
+			if (control & PCI_MSIX_FLAGS_ENABLE) {
+				dev_info(&pdev->dev, "resetting MSI-X\n");
+				pci_write_config_word(pdev,
+						      msi_control_reg(pos),
+						      control &
+						      ~PCI_MSIX_FLAGS_ENABLE);
+			}
+		}
+	}
 
 	/*
 	 * Announce PCI information