scsi: ibmvfc: Constify 'struct bin_attribute'

The sysfs core now allows instances of 'struct bin_attribute' to be moved
into read-only memory. Make use of that to protect them against accidental
or malicious modifications.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://lore.kernel.org/r/20241216-sysfs-const-bin_attr-scsi-v1-5-f0a5e54b3437@weissschuh.net
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

Author: t-8ch

drivers/scsi/ibmvscsi/ibmvfc.c

@@ -3639,7 +3639,7 @@ static DEVICE_ATTR(nr_scsi_channels, S_IRUGO | S_IWUSR,
  *	number of bytes printed to buffer
  **/
 static ssize_t ibmvfc_read_trace(struct file *filp, struct kobject *kobj,
-				 struct bin_attribute *bin_attr,
+				 const struct bin_attribute *bin_attr,
 				 char *buf, loff_t off, size_t count)
 {
 	struct device *dev = kobj_to_dev(kobj);
@@ -3662,13 +3662,13 @@ static ssize_t ibmvfc_read_trace(struct file *filp, struct kobject *kobj,
 	return count;
 }
 
-static struct bin_attribute ibmvfc_trace_attr = {
+static const struct bin_attribute ibmvfc_trace_attr = {
 	.attr =	{
 		.name = "trace",
 		.mode = S_IRUGO,
 	},
 	.size = 0,
-	.read = ibmvfc_read_trace,
+	.read_new = ibmvfc_read_trace,
 };
 #endif