diff mbox series

[v3,2/4] floppy: add FD_AUTODETECT_SIZE define for struct floppy_drive_params

Message ID 20200501134416.72248-3-efremov@linux.com (mailing list archive)
State New, archived
Headers show
Series floppy: suppress UBSAN warning in setup_rw_floppy() | expand

Commit Message

Denis Efremov (Oracle) May 1, 2020, 1:44 p.m. UTC 
Use FD_AUTODETECT_SIZE for autodetect buffer size in struct
floppy_drive_params instead of a magic number.

Signed-off-by: Denis Efremov <efremov@linux.com>
---
 drivers/block/floppy.c  | 9 +++++----
 include/uapi/linux/fd.h | 5 ++++-
 2 files changed, 9 insertions(+), 5 deletions(-)

Comments

Christoph Hellwig May 1, 2020, 3:36 p.m. UTC | #1 
On Fri, May 01, 2020 at 04:44:14PM +0300, Denis Efremov wrote:
> Use FD_AUTODETECT_SIZE for autodetect buffer size in struct
> floppy_drive_params instead of a magic number.

Looks good,

Reviewed-by: Christoph Hellwig <hch@lst.de>
diff mbox series

Patch

diff --git a/drivers/block/floppy.c b/drivers/block/floppy.c
index 3ab6e804b5ec..b82b3d38b834 100644
--- a/drivers/block/floppy.c
+++ b/drivers/block/floppy.c
@@ -2073,7 +2073,8 @@  static int next_valid_format(int drive)
 
 	probed_format = drive_state[drive].probed_format;
 	while (1) {
-		if (probed_format >= 8 || !drive_params[drive].autodetect[probed_format]) {
+		if (probed_format >= FD_AUTODETECT_SIZE ||
+		    !drive_params[drive].autodetect[probed_format]) {
 			drive_state[drive].probed_format = 0;
 			return 1;
 		}
@@ -3442,13 +3443,13 @@  static int fd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 	return 0;
 }
 
-static bool valid_floppy_drive_params(const short autodetect[8],
+static bool valid_floppy_drive_params(const short autodetect[FD_AUTODETECT_SIZE],
 		int native_format)
 {
 	size_t floppy_type_size = ARRAY_SIZE(floppy_type);
 	size_t i = 0;
 
-	for (i = 0; i < 8; ++i) {
+	for (i = 0; i < FD_AUTODETECT_SIZE; ++i) {
 		if (autodetect[i] < 0 ||
 		    autodetect[i] >= floppy_type_size)
 			return false;
@@ -3673,7 +3674,7 @@  struct compat_floppy_drive_params {
 	struct floppy_max_errors max_errors;
 	char		flags;
 	char		read_track;
-	short		autodetect[8];
+	short		autodetect[FD_AUTODETECT_SIZE];
 	compat_int_t	checkfreq;
 	compat_int_t	native_format;
 };
diff --git a/include/uapi/linux/fd.h b/include/uapi/linux/fd.h
index 90fb94712c41..3f6b7be4c096 100644
--- a/include/uapi/linux/fd.h
+++ b/include/uapi/linux/fd.h
@@ -172,7 +172,10 @@  struct floppy_drive_params {
  * used in succession to try to read the disk. If the FDC cannot lock onto
  * the disk, the next format is tried. This uses the variable 'probing'.
  */
-	short autodetect[8];		/* autodetected formats */
+
+#define FD_AUTODETECT_SIZE 8
+
+	short autodetect[FD_AUTODETECT_SIZE]; /* autodetected formats */
 	
 	int checkfreq; /* how often should the drive be checked for disk 
 			* changes */