floppy: cleanups: use ST0 as reply_buffer index 0

Use ST0 as 0 index for reply_buffer array. get_fdc_version() is the only
function that uses index 0 directly instead of the ST0 define.

Signed-off-by: Denis Efremov <efremov@linux.com>
Link: https://lore.kernel.org/r/20210416083449.72700-3-efremov@linux.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index 960e579..df5c329 100644 (file)
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -4232,7 +4232,7 @@ static char __init get_fdc_version(int fdc)
        r = result(fdc);
        if (r <= 0x00)
                return FDC_NONE;        /* No FDC present ??? */
-       if ((r == 1) && (reply_buffer[0] == 0x80)) {
+       if ((r == 1) && (reply_buffer[ST0] == 0x80)) {
                pr_info("FDC %d is an 8272A\n", fdc);
                return FDC_8272A;       /* 8272a/765 don't know DUMPREGS */
        }
@@ -4257,12 +4257,12 @@ static char __init get_fdc_version(int fdc)
 
        output_byte(fdc, FD_UNLOCK);
        r = result(fdc);
-       if ((r == 1) && (reply_buffer[0] == 0x80)) {
+       if ((r == 1) && (reply_buffer[ST0] == 0x80)) {
                pr_info("FDC %d is a pre-1991 82077\n", fdc);
                return FDC_82077_ORIG;  /* Pre-1991 82077, doesn't know
                                         * LOCK/UNLOCK */
        }
-       if ((r != 1) || (reply_buffer[0] != 0x00)) {
+       if ((r != 1) || (reply_buffer[ST0] != 0x00)) {
                pr_info("FDC %d init: UNLOCK: unexpected return of %d bytes.\n",
                        fdc, r);
                return FDC_UNKNOWN;
@@ -4274,11 +4274,11 @@ static char __init get_fdc_version(int fdc)
                        fdc, r);
                return FDC_UNKNOWN;
        }
-       if (reply_buffer[0] == 0x80) {
+       if (reply_buffer[ST0] == 0x80) {
                pr_info("FDC %d is a post-1991 82077\n", fdc);
                return FDC_82077;       /* Revised 82077AA passes all the tests */
        }
-       switch (reply_buffer[0] >> 5) {
+       switch (reply_buffer[ST0] >> 5) {
        case 0x0:
                /* Either a 82078-1 or a 82078SL running at 5Volt */
                pr_info("FDC %d is an 82078.\n", fdc);
@@ -4294,7 +4294,7 @@ static char __init get_fdc_version(int fdc)
                return FDC_87306;
        default:
                pr_info("FDC %d init: 82078 variant with unknown PARTID=%d.\n",
-                       fdc, reply_buffer[0] >> 5);
+                       fdc, reply_buffer[ST0] >> 5);
                return FDC_82078_UNKN;
        }
 }                              /* get_fdc_version */