[SCSI] lpfc: Add range checking for attributes passed as options at load time.

Reuse macros defined for sysfs store callbacks in the initialization
code in order to enforce the same range checking.
Signed-off-by: James Smart <James.Smart@emulex.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/lpfc/lpfc_attr.c

@@ -286,45 +286,69 @@ lpfc_##attr##_show(struct class_device *cdev, char *buf) \
 	struct Scsi_Host *host = class_to_shost(cdev);\
 	struct lpfc_hba *phba = (struct lpfc_hba*)host->hostdata[0];\
 	int val = 0;\
-	if (phba){\
-		val = phba->cfg_##attr;\
-		return snprintf(buf, PAGE_SIZE, "%d\n",\
-				phba->cfg_##attr);\
+	val = phba->cfg_##attr;\
+	return snprintf(buf, PAGE_SIZE, "%d\n",\
+			phba->cfg_##attr);\
+}
+
+#define lpfc_param_init(attr, default, minval, maxval)	\
+static int \
+lpfc_##attr##_init(struct lpfc_hba *phba, int val) \
+{ \
+	if (val >= minval && val <= maxval) {\
+		phba->cfg_##attr = val;\
+		return 0;\
 	}\
-	return -EPERM;\
+	lpfc_printf_log(phba, KERN_ERR, LOG_INIT, \
+			"%d:0449 lpfc_"#attr" attribute cannot be set to %d, "\
+			"allowed range is ["#minval", "#maxval"]\n", \
+			phba->brd_no, val); \
+	phba->cfg_##attr = default;\
+	return -EINVAL;\
 }
 
-#define lpfc_param_store(attr, minval, maxval)	\
+#define lpfc_param_set(attr, default, minval, maxval)	\
+static int \
+lpfc_##attr##_set(struct lpfc_hba *phba, int val) \
+{ \
+	if (val >= minval && val <= maxval) {\
+		phba->cfg_##attr = val;\
+		return 0;\
+	}\
+	lpfc_printf_log(phba, KERN_ERR, LOG_INIT, \
+			"%d:0450 lpfc_"#attr" attribute cannot be set to %d, "\
+			"allowed range is ["#minval", "#maxval"]\n", \
+			phba->brd_no, val); \
+	return -EINVAL;\
+}
+
+#define lpfc_param_store(attr)	\
 static ssize_t \
 lpfc_##attr##_store(struct class_device *cdev, const char *buf, size_t count) \
 { \
 	struct Scsi_Host *host = class_to_shost(cdev);\
 	struct lpfc_hba *phba = (struct lpfc_hba*)host->hostdata[0];\
-	int val = 0;\
-	if (!isdigit(buf[0]))\
-		return -EINVAL;\
-	if (sscanf(buf, "0x%x", &val) != 1)\
-		if (sscanf(buf, "%d", &val) != 1)\
-			return -EINVAL;\
-	if (val >= minval && val <= maxval) {\
-		phba->cfg_##attr = val;\
+	int val=0;\
+	if (sscanf(buf, "%d", &val) != 1)\
+	return -EPERM;\
+	if (lpfc_##attr##_set(phba, val) == 0) \
 		return strlen(buf);\
-	}\
-	return -EINVAL;\
+	else \
+		return -EINVAL;\
 }
 
-#define LPFC_ATTR_R_NOINIT(name, desc) \
-extern int lpfc_##name;\
+#define LPFC_ATTR(name, defval, minval, maxval, desc) \
+static int lpfc_##name = defval;\
 module_param(lpfc_##name, int, 0);\
 MODULE_PARM_DESC(lpfc_##name, desc);\
-lpfc_param_show(name)\
-static CLASS_DEVICE_ATTR(lpfc_##name, S_IRUGO , lpfc_##name##_show, NULL)
+lpfc_param_init(name, defval, minval, maxval)
 
 #define LPFC_ATTR_R(name, defval, minval, maxval, desc) \
 static int lpfc_##name = defval;\
 module_param(lpfc_##name, int, 0);\
 MODULE_PARM_DESC(lpfc_##name, desc);\
 lpfc_param_show(name)\
+lpfc_param_init(name, defval, minval, maxval)\
 static CLASS_DEVICE_ATTR(lpfc_##name, S_IRUGO , lpfc_##name##_show, NULL)
 
 #define LPFC_ATTR_RW(name, defval, minval, maxval, desc) \
@@ -332,7 +356,9 @@ static int lpfc_##name = defval;\
 module_param(lpfc_##name, int, 0);\
 MODULE_PARM_DESC(lpfc_##name, desc);\
 lpfc_param_show(name)\
-lpfc_param_store(name, minval, maxval)\
+lpfc_param_init(name, defval, minval, maxval)\
+lpfc_param_set(name, defval, minval, maxval)\
+lpfc_param_store(name)\
 static CLASS_DEVICE_ATTR(lpfc_##name, S_IRUGO | S_IWUSR,\
 			 lpfc_##name##_show, lpfc_##name##_store)
 
@@ -464,14 +490,10 @@ LPFC_ATTR_R(ack0, 0, 0, 1, "Enable ACK0 support");
 # is 0. Default value of cr_count is 1. The cr_count feature is disabled if
 # cr_delay is set to 0.
 */
-static int lpfc_cr_delay = 0;
-module_param(lpfc_cr_delay, int , 0);
-MODULE_PARM_DESC(lpfc_cr_delay, "A count of milliseconds after which an "
+LPFC_ATTR(cr_delay, 0, 0, 63, "A count of milliseconds after which an"
 		"interrupt response is generated");
 
-static int lpfc_cr_count = 1;
-module_param(lpfc_cr_count, int, 0);
-MODULE_PARM_DESC(lpfc_cr_count, "A count of I/O completions after which an "
+LPFC_ATTR(cr_count, 1, 1, 255, "A count of I/O completions after which an"
 		"interrupt response is generated");
 
 /*
@@ -487,9 +509,7 @@ LPFC_ATTR_RW(fdmi_on, 0, 0, 2, "Enable FDMI support");
 # Specifies the maximum number of ELS cmds we can have outstanding (for
 # discovery). Value range is [1,64]. Default value = 32.
 */
-static int lpfc_discovery_threads = 32;
-module_param(lpfc_discovery_threads, int, 0);
-MODULE_PARM_DESC(lpfc_discovery_threads, "Maximum number of ELS commands "
+LPFC_ATTR(discovery_threads, 32, 1, 64, "Maximum number of ELS commands"
 		 "during discovery");
 
 /*
@@ -1225,20 +1245,20 @@ struct fc_function_template lpfc_transport_functions = {
 void
 lpfc_get_cfgparam(struct lpfc_hba *phba)
 {
-	phba->cfg_log_verbose = lpfc_log_verbose;
-	phba->cfg_cr_delay = lpfc_cr_delay;
-	phba->cfg_cr_count = lpfc_cr_count;
-	phba->cfg_lun_queue_depth = lpfc_lun_queue_depth;
-	phba->cfg_fcp_class = lpfc_fcp_class;
-	phba->cfg_use_adisc = lpfc_use_adisc;
-	phba->cfg_ack0 = lpfc_ack0;
-	phba->cfg_topology = lpfc_topology;
-	phba->cfg_scan_down = lpfc_scan_down;
-	phba->cfg_nodev_tmo = lpfc_nodev_tmo;
-	phba->cfg_link_speed = lpfc_link_speed;
-	phba->cfg_fdmi_on = lpfc_fdmi_on;
-	phba->cfg_discovery_threads = lpfc_discovery_threads;
-	phba->cfg_max_luns = lpfc_max_luns;
+	lpfc_log_verbose_init(phba, lpfc_log_verbose);
+	lpfc_cr_delay_init(phba, lpfc_cr_delay);
+	lpfc_cr_count_init(phba, lpfc_cr_count);
+	lpfc_lun_queue_depth_init(phba, lpfc_lun_queue_depth);
+	lpfc_fcp_class_init(phba, lpfc_fcp_class);
+	lpfc_use_adisc_init(phba, lpfc_use_adisc);
+	lpfc_ack0_init(phba, lpfc_ack0);
+	lpfc_topology_init(phba, lpfc_topology);
+	lpfc_scan_down_init(phba, lpfc_scan_down);
+	lpfc_nodev_tmo_init(phba, lpfc_nodev_tmo);
+	lpfc_link_speed_init(phba, lpfc_link_speed);
+	lpfc_fdmi_on_init(phba, lpfc_fdmi_on);
+	lpfc_discovery_threads_init(phba, lpfc_discovery_threads);
+	lpfc_max_luns_init(phba, lpfc_max_luns);
 
 	/*
 	 * The total number of segments is the configuration value plus 2