1 files changed, 176 insertions, 82 deletions

diff --git a/drivers/scsi/scsi_transport_spi.c b/drivers/scsi/scsi_transport_spi.c
index 4df21c92ff1e..1fb60313a516 100644
--- a/drivers/scsi/scsi_transport_spi.c
+++ b/drivers/scsi/scsi_transport_spi.c
@@ -52,13 +52,6 @@
 struct spi_internal {
 	struct scsi_transport_template t;
 	struct spi_function_template *f;
-	/* The actual attributes */
-	struct class_device_attribute private_attrs[SPI_NUM_ATTRS];
-	/* The array of null terminated pointers to attributes 
-	 * needed by scsi_sysfs.c */
-	struct class_device_attribute *attrs[SPI_NUM_ATTRS + SPI_OTHER_ATTRS + 1];
-	struct class_device_attribute private_host_attrs[SPI_HOST_ATTRS];
-	struct class_device_attribute *host_attrs[SPI_HOST_ATTRS + 1];
 };
 
 #define to_spi_internal(tmpl)	container_of(tmpl, struct spi_internal, t)
@@ -174,17 +167,20 @@ static int spi_host_setup(struct transport_container *tc, struct device *dev,
 	return 0;
 }
 
+static int spi_host_configure(struct transport_container *tc,
+			      struct device *dev,
+			      struct class_device *cdev);
+
 static DECLARE_TRANSPORT_CLASS(spi_host_class,
 			       "spi_host",
 			       spi_host_setup,
 			       NULL,
-			       NULL);
+			       spi_host_configure);
 
 static int spi_host_match(struct attribute_container *cont,
 			  struct device *dev)
 {
 	struct Scsi_Host *shost;
-	struct spi_internal *i;
 
 	if (!scsi_is_host_device(dev))
 		return 0;
@@ -194,11 +190,13 @@ static int spi_host_match(struct attribute_container *cont,
 	    != &spi_host_class.class)
 		return 0;
 
-	i = to_spi_internal(shost->transportt);
-	
-	return &i->t.host_attrs.ac == cont;
+	return &shost->transportt->host_attrs.ac == cont;
 }
 
+static int spi_target_configure(struct transport_container *tc,
+				struct device *dev,
+				struct class_device *cdev);
+
 static int spi_device_configure(struct transport_container *tc,
 				struct device *dev,
 				struct class_device *cdev)
@@ -300,8 +298,10 @@ store_spi_transport_##field(struct class_device *cdev, const char *buf, \
 	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);	\
 	struct spi_internal *i = to_spi_internal(shost->transportt);	\
 									\
+	if (!i->f->set_##field)						\
+		return -EINVAL;						\
 	val = simple_strtoul(buf, NULL, 0);				\
-	i->f->set_##field(starget, val);			\
+	i->f->set_##field(starget, val);				\
 	return count;							\
 }
 
@@ -317,6 +317,8 @@ store_spi_transport_##field(struct class_device *cdev, const char *buf, \
 	struct spi_transport_attrs *tp					\
 		= (struct spi_transport_attrs *)&starget->starget_data;	\
 									\
+	if (i->f->set_##field)						\
+		return -EINVAL;						\
 	val = simple_strtoul(buf, NULL, 0);				\
 	if (val > tp->max_##field)					\
 		val = tp->max_##field;					\
@@ -327,14 +329,14 @@ store_spi_transport_##field(struct class_device *cdev, const char *buf, \
 #define spi_transport_rd_attr(field, format_string)			\
 	spi_transport_show_function(field, format_string)		\
 	spi_transport_store_function(field, format_string)		\
-static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR,			\
+static CLASS_DEVICE_ATTR(field, S_IRUGO,				\
 			 show_spi_transport_##field,			\
 			 store_spi_transport_##field);
 
 #define spi_transport_simple_attr(field, format_string)			\
 	spi_transport_show_simple(field, format_string)			\
 	spi_transport_store_simple(field, format_string)		\
-static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR,			\
+static CLASS_DEVICE_ATTR(field, S_IRUGO,				\
 			 show_spi_transport_##field,			\
 			 store_spi_transport_##field);
 
@@ -342,7 +344,7 @@ static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR,			\
 	spi_transport_show_function(field, format_string)		\
 	spi_transport_store_max(field, format_string)			\
 	spi_transport_simple_attr(max_##field, format_string)		\
-static CLASS_DEVICE_ATTR(field, S_IRUGO | S_IWUSR,			\
+static CLASS_DEVICE_ATTR(field, S_IRUGO,				\
 			 show_spi_transport_##field,			\
 			 store_spi_transport_##field);
 
@@ -472,6 +474,9 @@ store_spi_transport_period(struct class_device *cdev, const char *buf,
 		(struct spi_transport_attrs *)&starget->starget_data;
 	int period, retval;
 
+	if (!i->f->set_period)
+		return -EINVAL;
+
 	retval = store_spi_transport_period_helper(cdev, buf, count, &period);
 
 	if (period < tp->min_period)
@@ -482,7 +487,7 @@ store_spi_transport_period(struct class_device *cdev, const char *buf,
 	return retval;
 }
 
-static CLASS_DEVICE_ATTR(period, S_IRUGO | S_IWUSR, 
+static CLASS_DEVICE_ATTR(period, S_IRUGO,
 			 show_spi_transport_period,
 			 store_spi_transport_period);
 
@@ -490,9 +495,14 @@ static ssize_t
 show_spi_transport_min_period(struct class_device *cdev, char *buf)
 {
 	struct scsi_target *starget = transport_class_to_starget(cdev);
+	struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
+	struct spi_internal *i = to_spi_internal(shost->transportt);
 	struct spi_transport_attrs *tp =
 		(struct spi_transport_attrs *)&starget->starget_data;
 
+	if (!i->f->set_period)
+		return -EINVAL;
+
 	return show_spi_transport_period_helper(buf, tp->min_period);
 }
 
@@ -509,7 +519,7 @@ store_spi_transport_min_period(struct class_device *cdev, const char *buf,
 }
 
 
-static CLASS_DEVICE_ATTR(min_period, S_IRUGO | S_IWUSR, 
+static CLASS_DEVICE_ATTR(min_period, S_IRUGO,
 			 show_spi_transport_min_period,
 			 store_spi_transport_min_period);
 
@@ -531,12 +541,15 @@ static ssize_t store_spi_host_signalling(struct class_device *cdev,
 	struct spi_internal *i = to_spi_internal(shost->transportt);
 	enum spi_signal_type type = spi_signal_to_value(buf);
 
+	if (!i->f->set_signalling)
+		return -EINVAL;
+
 	if (type != SPI_SIGNAL_UNKNOWN)
 		i->f->set_signalling(shost, type);
 
 	return count;
 }
-static CLASS_DEVICE_ATTR(signalling, S_IRUGO | S_IWUSR,
+static CLASS_DEVICE_ATTR(signalling, S_IRUGO,
 			 show_spi_host_signalling,
 			 store_spi_host_signalling);
 
@@ -1262,35 +1275,6 @@ int spi_print_msg(const unsigned char *msg)
 EXPORT_SYMBOL(spi_print_msg);
 #endif /* ! CONFIG_SCSI_CONSTANTS */
 
-#define SETUP_ATTRIBUTE(field)						\
-	i->private_attrs[count] = class_device_attr_##field;		\
-	if (!i->f->set_##field) {					\
-		i->private_attrs[count].attr.mode = S_IRUGO;		\
-		i->private_attrs[count].store = NULL;			\
-	}								\
-	i->attrs[count] = &i->private_attrs[count];			\
-	if (i->f->show_##field)						\
-		count++
-
-#define SETUP_RELATED_ATTRIBUTE(field, rel_field)			\
-	i->private_attrs[count] = class_device_attr_##field;		\
-	if (!i->f->set_##rel_field) {					\
-		i->private_attrs[count].attr.mode = S_IRUGO;		\
-		i->private_attrs[count].store = NULL;			\
-	}								\
-	i->attrs[count] = &i->private_attrs[count];			\
-	if (i->f->show_##rel_field)					\
-		count++
-
-#define SETUP_HOST_ATTRIBUTE(field)					\
-	i->private_host_attrs[count] = class_device_attr_##field;	\
-	if (!i->f->set_##field) {					\
-		i->private_host_attrs[count].attr.mode = S_IRUGO;	\
-		i->private_host_attrs[count].store = NULL;		\
-	}								\
-	i->host_attrs[count] = &i->private_host_attrs[count];		\
-	count++
-
 static int spi_device_match(struct attribute_container *cont,
 			    struct device *dev)
 {
@@ -1343,16 +1327,156 @@ static DECLARE_TRANSPORT_CLASS(spi_transport_class,
 			       "spi_transport",
 			       spi_setup_transport_attrs,
 			       NULL,
-			       NULL);
+			       spi_target_configure);
 
 static DECLARE_ANON_TRANSPORT_CLASS(spi_device_class,
 				    spi_device_match,
 				    spi_device_configure);
 
+static struct attribute *host_attributes[] = {
+	&class_device_attr_signalling.attr,
+	NULL
+};
+
+static struct attribute_group host_attribute_group = {
+	.attrs = host_attributes,
+};
+
+static int spi_host_configure(struct transport_container *tc,
+			      struct device *dev,
+			      struct class_device *cdev)
+{
+	struct kobject *kobj = &cdev->kobj;
+	struct Scsi_Host *shost = transport_class_to_shost(cdev);
+	struct spi_internal *si = to_spi_internal(shost->transportt);
+	struct attribute *attr = &class_device_attr_signalling.attr;
+	int rc = 0;
+
+	if (si->f->set_signalling)
+		rc = sysfs_chmod_file(kobj, attr, attr->mode | S_IWUSR);
+
+	return rc;
+}
+
+/* returns true if we should be showing the variable.  Also
+ * overloads the return by setting 1<<1 if the attribute should
+ * be writeable */
+#define TARGET_ATTRIBUTE_HELPER(name) \
+	(si->f->show_##name ? 1 : 0) + \
+	(si->f->set_##name ? 2 : 0)
+
+static int target_attribute_is_visible(struct kobject *kobj,
+				       struct attribute *attr, int i)
+{
+	struct class_device *cdev =
+		container_of(kobj, struct class_device, kobj);
+	struct scsi_target *starget = transport_class_to_starget(cdev);
+	struct Scsi_Host *shost = transport_class_to_shost(cdev);
+	struct spi_internal *si = to_spi_internal(shost->transportt);
+
+	if (attr == &class_device_attr_period.attr &&
+	    spi_support_sync(starget))
+		return TARGET_ATTRIBUTE_HELPER(period);
+	else if (attr == &class_device_attr_min_period.attr &&
+		 spi_support_sync(starget))
+		return TARGET_ATTRIBUTE_HELPER(period);
+	else if (attr == &class_device_attr_offset.attr &&
+		 spi_support_sync(starget))
+		return TARGET_ATTRIBUTE_HELPER(offset);
+	else if (attr == &class_device_attr_max_offset.attr &&
+		 spi_support_sync(starget))
+		return TARGET_ATTRIBUTE_HELPER(offset);
+	else if (attr == &class_device_attr_width.attr &&
+		 spi_support_wide(starget))
+		return TARGET_ATTRIBUTE_HELPER(width);
+	else if (attr == &class_device_attr_max_width.attr &&
+		 spi_support_wide(starget))
+		return TARGET_ATTRIBUTE_HELPER(width);
+	else if (attr == &class_device_attr_iu.attr &&
+		 spi_support_ius(starget))
+		return TARGET_ATTRIBUTE_HELPER(iu);
+	else if (attr == &class_device_attr_dt.attr &&
+		 spi_support_dt(starget))
+		return TARGET_ATTRIBUTE_HELPER(dt);
+	else if (attr == &class_device_attr_qas.attr &&
+		 spi_support_qas(starget))
+		return TARGET_ATTRIBUTE_HELPER(qas);
+	else if (attr == &class_device_attr_wr_flow.attr &&
+		 spi_support_ius(starget))
+		return TARGET_ATTRIBUTE_HELPER(wr_flow);
+	else if (attr == &class_device_attr_rd_strm.attr &&
+		 spi_support_ius(starget))
+		return TARGET_ATTRIBUTE_HELPER(rd_strm);
+	else if (attr == &class_device_attr_rti.attr &&
+		 spi_support_ius(starget))
+		return TARGET_ATTRIBUTE_HELPER(rti);
+	else if (attr == &class_device_attr_pcomp_en.attr &&
+		 spi_support_ius(starget))
+		return TARGET_ATTRIBUTE_HELPER(pcomp_en);
+	else if (attr == &class_device_attr_hold_mcs.attr &&
+		 spi_support_ius(starget))
+		return TARGET_ATTRIBUTE_HELPER(hold_mcs);
+	else if (attr == &class_device_attr_revalidate.attr)
+		return 1;
+
+	return 0;
+}
+
+static struct attribute *target_attributes[] = {
+	&class_device_attr_period.attr,
+	&class_device_attr_min_period.attr,
+	&class_device_attr_offset.attr,
+	&class_device_attr_max_offset.attr,
+	&class_device_attr_width.attr,
+	&class_device_attr_max_width.attr,
+	&class_device_attr_iu.attr,
+	&class_device_attr_dt.attr,
+	&class_device_attr_qas.attr,
+	&class_device_attr_wr_flow.attr,
+	&class_device_attr_rd_strm.attr,
+	&class_device_attr_rti.attr,
+	&class_device_attr_pcomp_en.attr,
+	&class_device_attr_hold_mcs.attr,
+	&class_device_attr_revalidate.attr,
+	NULL
+};
+
+static struct attribute_group target_attribute_group = {
+	.attrs = target_attributes,
+	.is_visible = target_attribute_is_visible,
+};
+
+static int spi_target_configure(struct transport_container *tc,
+				struct device *dev,
+				struct class_device *cdev)
+{
+	struct kobject *kobj = &cdev->kobj;
+	int i;
+	struct attribute *attr;
+	int rc;
+
+	for (i = 0; (attr = target_attributes[i]) != NULL; i++) {
+		int j = target_attribute_group.is_visible(kobj, attr, i);
+
+		/* FIXME: as well as returning -EEXIST, which we'd like
+		 * to ignore, sysfs also does a WARN_ON and dumps a trace,
+		 * which is bad, so temporarily, skip attributes that are
+		 * already visible (the revalidate one) */
+		if (j && attr != &class_device_attr_revalidate.attr)
+			rc = sysfs_add_file_to_group(kobj, attr,
+						target_attribute_group.name);
+		/* and make the attribute writeable if we have a set
+		 * function */
+		if ((j & 1))
+			rc = sysfs_chmod_file(kobj, attr, attr->mode | S_IWUSR);
+	}
+
+	return 0;
+}
+
 struct scsi_transport_template *
 spi_attach_transport(struct spi_function_template *ft)
 {
-	int count = 0;
 	struct spi_internal *i = kzalloc(sizeof(struct spi_internal),
 					 GFP_KERNEL);
 
@@ -1360,47 +1484,17 @@ spi_attach_transport(struct spi_function_template *ft)
 		return NULL;
 
 	i->t.target_attrs.ac.class = &spi_transport_class.class;
-	i->t.target_attrs.ac.attrs = &i->attrs[0];
+	i->t.target_attrs.ac.grp = &target_attribute_group;
 	i->t.target_attrs.ac.match = spi_target_match;
 	transport_container_register(&i->t.target_attrs);
 	i->t.target_size = sizeof(struct spi_transport_attrs);
 	i->t.host_attrs.ac.class = &spi_host_class.class;
-	i->t.host_attrs.ac.attrs = &i->host_attrs[0];
+	i->t.host_attrs.ac.grp = &host_attribute_group;
 	i->t.host_attrs.ac.match = spi_host_match;
 	transport_container_register(&i->t.host_attrs);
 	i->t.host_size = sizeof(struct spi_host_attrs);
 	i->f = ft;
 
-	SETUP_ATTRIBUTE(period);
-	SETUP_RELATED_ATTRIBUTE(min_period, period);
-	SETUP_ATTRIBUTE(offset);
-	SETUP_RELATED_ATTRIBUTE(max_offset, offset);
-	SETUP_ATTRIBUTE(width);
-	SETUP_RELATED_ATTRIBUTE(max_width, width);
-	SETUP_ATTRIBUTE(iu);
-	SETUP_ATTRIBUTE(dt);
-	SETUP_ATTRIBUTE(qas);
-	SETUP_ATTRIBUTE(wr_flow);
-	SETUP_ATTRIBUTE(rd_strm);
-	SETUP_ATTRIBUTE(rti);
-	SETUP_ATTRIBUTE(pcomp_en);
-	SETUP_ATTRIBUTE(hold_mcs);
-
-	/* if you add an attribute but forget to increase SPI_NUM_ATTRS
-	 * this bug will trigger */
-	BUG_ON(count > SPI_NUM_ATTRS);
-
-	i->attrs[count++] = &class_device_attr_revalidate;
-
-	i->attrs[count] = NULL;
-
-	count = 0;
-	SETUP_HOST_ATTRIBUTE(signalling);
-
-	BUG_ON(count > SPI_HOST_ATTRS);
-
-	i->host_attrs[count] = NULL;
-
 	return &i->t;
 }
 EXPORT_SYMBOL(spi_attach_transport);