[SCSI] qla2xxx: use memory_read_from_buffer()

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 9 insertions, 35 deletions

diff --git a/drivers/scsi/qla2xxx/qla_attr.c b/drivers/scsi/qla2xxx/qla_attr.c
index 612e3d0c7bd1..fcec43a32be3 100644
--- a/drivers/scsi/qla2xxx/qla_attr.c
+++ b/drivers/scsi/qla2xxx/qla_attr.c
@@ -20,18 +20,12 @@ qla2x00_sysfs_read_fw_dump(struct kobject *kobj,
 {
         struct scsi_qla_host *ha = shost_priv(dev_to_shost(container_of(kobj,
             struct device, kobj)));
-        char *rbuf = (char *)ha->fw_dump;
 
         if (ha->fw_dump_reading == 0)
                 return 0;
-        if (off > ha->fw_dump_len)
-                return 0;
-        if (off + count > ha->fw_dump_len)
-                count = ha->fw_dump_len - off;
 
-        memcpy(buf, &rbuf[off], count);
-
-        return (count);
+        return memory_read_from_buffer(buf, count, &off, ha->fw_dump,
+                                        ha->fw_dump_len);
 }
 
 static ssize_t
@@ -94,20 +88,13 @@ qla2x00_sysfs_read_nvram(struct kobject *kobj,
 {
         struct scsi_qla_host *ha = shost_priv(dev_to_shost(container_of(kobj,
             struct device, kobj)));
-        int             size = ha->nvram_size;
-        char            *nvram_cache = ha->nvram;
 
-        if (!capable(CAP_SYS_ADMIN) || off > size || count == 0)
+        if (!capable(CAP_SYS_ADMIN))
                 return 0;
-        if (off + count > size) {
-                size -= off;
-                count = size;
-        }
 
         /* Read NVRAM data from cache. */
-        memcpy(buf, &nvram_cache[off], count);
-
-        return count;
+        return memory_read_from_buffer(buf, count, &off, ha->nvram,
+                                        ha->nvram_size);
 }
 
 static ssize_t
@@ -175,14 +162,9 @@ qla2x00_sysfs_read_optrom(struct kobject *kobj,
 
         if (ha->optrom_state != QLA_SREADING)
                 return 0;
-        if (off > ha->optrom_region_size)
-                return 0;
-        if (off + count > ha->optrom_region_size)
-                count = ha->optrom_region_size - off;
 
-        memcpy(buf, &ha->optrom_buffer[off], count);
-
-        return count;
+        return memory_read_from_buffer(buf, count, &off, ha->optrom_buffer,
+                                        ha->optrom_region_size);
 }
 
 static ssize_t
@@ -374,20 +356,12 @@ qla2x00_sysfs_read_vpd(struct kobject *kobj,
 {
         struct scsi_qla_host *ha = shost_priv(dev_to_shost(container_of(kobj,
             struct device, kobj)));
-        int           size = ha->vpd_size;
-        char          *vpd_cache = ha->vpd;
 
-        if (!capable(CAP_SYS_ADMIN) || off > size || count == 0)
+        if (!capable(CAP_SYS_ADMIN))
                 return 0;
-        if (off + count > size) {
-                size -= off;
-                count = size;
-        }
 
         /* Read NVRAM data from cache. */
-        memcpy(buf, &vpd_cache[off], count);
-
-        return count;
+        return memory_read_from_buffer(buf, count, &off, ha->vpd, ha->vpd_size);
 }
 
 static ssize_t