target: simplify target_parse_naa_6h_vendor_specific()

This patch adds a minor simplfication in target_parse_naa_6h_vendor_specific()
to remove direct isxdigit() + ctype.h usage.

(nab: Fix next assignment breakage in for loop)

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

1 files changed, 14 insertions, 15 deletions

diff --git a/drivers/target/target_core_cdb.c b/drivers/target/target_core_cdb.c
index f04d4ef99dc..0d02391d1fb 100644
--- a/drivers/target/target_core_cdb.c
+++ b/drivers/target/target_core_cdb.c
@@ -24,7 +24,6 @@
  */
 
 #include <linux/kernel.h>
-#include <linux/ctype.h>
 #include <asm/unaligned.h>
 #include <scsi/scsi.h>
 
@@ -156,11 +155,12 @@ target_emulate_evpd_80(struct se_cmd *cmd, unsigned char *buf)
 }
 
 static void
-target_parse_naa_6h_vendor_specific(struct se_device *dev, unsigned char *buf_off)
+target_parse_naa_6h_vendor_specific(struct se_device *dev, unsigned char *buf)
 {
         unsigned char *p = &dev->se_sub_dev->t10_wwn.unit_serial[0];
-        unsigned char *buf = buf_off;
-        int cnt = 0, next = 1;
+        int cnt;
+        bool next = true;
+
         /*
          * Generate up to 36 bits of VENDOR SPECIFIC IDENTIFIER starting on
          * byte 3 bit 3-0 for NAA IEEE Registered Extended DESIGNATOR field
@@ -169,19 +169,18 @@ target_parse_naa_6h_vendor_specific(struct se_device *dev, unsigned char *buf_of
          * NUMBER set via vpd_unit_serial in target_core_configfs.c to ensure
          * per device uniqeness.
          */
-        while (*p != '\0') {
-                if (cnt >= 13)
-                        break;
-                if (!isxdigit(*p)) {
-                        p++;
+        for (cnt = 0; *p && cnt < 13; p++) {
+                int val = hex_to_bin(*p);
+
+                if (val < 0)
                         continue;
-                }
-                if (next != 0) {
-                        buf[cnt++] |= hex_to_bin(*p++);
-                        next = 0;
+
+                if (next) {
+                        next = false;
+                        buf[cnt++] |= val;
                 } else {
-                        buf[cnt] = hex_to_bin(*p++) << 4;
-                        next = 1;
+                        next = true;
+                        buf[cnt] = val << 4;
                 }
         }
 }