[PATCH] aic94xx: Use request_firmware() to provide SAS address if the adapter lacks one

["Darrick J. Wong" <djwong@us.ibm.com>]

If the aic94xx chip doesn't have a SAS address in the chip's flash memory,
use the request_firmware() interface to get one from userspace.  This
way, there's no debate as to who or how an address gets generated--it's
totally up to the administrator to provide it if the card doesn't have one.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
---

 drivers/scsi/aic94xx/aic94xx.h      |    1 -
 drivers/scsi/aic94xx/aic94xx_hwi.c  |   40 +++++++++++++++++++++++++----------
 drivers/scsi/aic94xx/aic94xx_init.c |    2 --
 3 files changed, 29 insertions(+), 14 deletions(-)

diff --git a/drivers/scsi/aic94xx/aic94xx.h b/drivers/scsi/aic94xx/aic94xx.h
index 32f513b..935d558 100644
--- a/drivers/scsi/aic94xx/aic94xx.h
+++ b/drivers/scsi/aic94xx/aic94xx.h
@@ -58,7 +58,6 @@
 
 extern struct kmem_cache *asd_dma_token_cache;
 extern struct kmem_cache *asd_ascb_cache;
-extern char sas_addr_str[2*SAS_ADDR_SIZE + 1];
 
 static inline void asd_stringify_sas_addr(char *p, const u8 *sas_addr)
 {
diff --git a/drivers/scsi/aic94xx/aic94xx_hwi.c b/drivers/scsi/aic94xx/aic94xx_hwi.c
index 0cd7eed..82a12cc 100644
--- a/drivers/scsi/aic94xx/aic94xx_hwi.c
+++ b/drivers/scsi/aic94xx/aic94xx_hwi.c
@@ -27,6 +27,7 @@
 #include <linux/pci.h>
 #include <linux/delay.h>
 #include <linux/module.h>
+#include <linux/firmware.h>
 
 #include "aic94xx.h"
 #include "aic94xx_reg.h"
@@ -38,16 +39,34 @@ u32 MBAR0_SWB_SIZE;
 
 /* ---------- Initialization ---------- */
 
-static void asd_get_user_sas_addr(struct asd_ha_struct *asd_ha)
+#define SAS_STRING_ADDR_SIZE	16
+static int asd_get_user_sas_addr(struct asd_ha_struct *asd_ha)
 {
-	extern char sas_addr_str[];
-	/* If the user has specified a WWN it overrides other settings
-	 */
-	if (sas_addr_str[0] != '\0')
-		asd_destringify_sas_addr(asd_ha->hw_prof.sas_addr,
-					 sas_addr_str);
-	else if (asd_ha->hw_prof.sas_addr[0] != 0)
-		asd_stringify_sas_addr(sas_addr_str, asd_ha->hw_prof.sas_addr);
+	const struct firmware *fw;
+	int res;
+
+	/* adapter came with a sas address */
+	if (asd_ha->hw_prof.sas_addr[0])
+		return 0;
+
+	ASD_DPRINTK("No address found for %s; asking for one...\n",
+		    pci_name(asd_ha->pcidev));
+
+	/* else go ask userspace */
+	res = request_firmware(&fw, "sas_addr", &asd_ha->pcidev->dev);
+	if (res)
+		return res;
+
+	if (fw->size < SAS_STRING_ADDR_SIZE) {
+		res = -ENODEV;
+		goto out;
+	}
+
+	asd_destringify_sas_addr(asd_ha->hw_prof.sas_addr, fw->data);
+
+out:
+	release_firmware(fw);
+	return res;
 }
 
 static void asd_propagate_sas_addr(struct asd_ha_struct *asd_ha)
@@ -657,8 +676,7 @@ int asd_init_hw(struct asd_ha_struct *asd_ha)
 
 	asd_init_ctxmem(asd_ha);
 
-	asd_get_user_sas_addr(asd_ha);
-	if (!asd_ha->hw_prof.sas_addr[0]) {
+	if (asd_get_user_sas_addr(asd_ha)) {
 		asd_printk("No SAS Address provided for %s\n",
 			   pci_name(asd_ha->pcidev));
 		err = -ENODEV;
diff --git a/drivers/scsi/aic94xx/aic94xx_init.c b/drivers/scsi/aic94xx/aic94xx_init.c
index b70d6e7..5c99f27 100644
--- a/drivers/scsi/aic94xx/aic94xx_init.c
+++ b/drivers/scsi/aic94xx/aic94xx_init.c
@@ -54,8 +54,6 @@ MODULE_PARM_DESC(collector, "\n"
 	"\tThe aic94xx SAS LLDD supports both modes.\n"
 	"\tDefault: 0 (Direct Mode).\n");
 
-char sas_addr_str[2*SAS_ADDR_SIZE + 1] = "";
-
 static struct scsi_transport_template *aic94xx_transport_template;
 static int asd_scan_finished(struct Scsi_Host *, unsigned long);
 static void asd_scan_start(struct Scsi_Host *);