[Qemu-devel] [PATCH 1/2] fdc: Drop broken code for user-defined floppy geometry

[Markus Armbruster <armbru@redhat.com>]

bdrv_get_floppy_geometry_hint() fails to store through its parameter
drive when bs has a geometry hint.  Makes fd_revalidate() assign
random crap to drv->drive.

Has been broken that way for ages.  Harmless, because:

* The only way to set a geometry hint is -drive if=none,cyls=...
  Since commit c219331e, probably unintentional.

* The only use of drv->drive is as argument to another
  bdrv_get_floppy_geometry_hint().  Which doesn't use it, since the
  geometry hint is still there.

Drop the broken code, ignore -drive parameter cyls, heads and secs for
floppies even with if=none, just like before commit c219331e.  Matches
-help, which explains cyls, heads, secs as "hard disk physical
geometry".

Signed-off-by: Markus Armbruster <armbru@redhat.com>
---
 block.c  |   62 ++++++++++++++++++++++++++++----------------------------------
 hw/fdc.c |    3 ---
 2 files changed, 28 insertions(+), 37 deletions(-)

diff --git a/block.c b/block.c
index 0acdcac..f5e7cb6 100644
--- a/block.c
+++ b/block.c
@@ -2308,46 +2308,40 @@ void bdrv_get_floppy_geometry_hint(BlockDriverState *bs, int *nb_heads,
     uint64_t nb_sectors, size;
     int i, first_match, match;
 
-    bdrv_get_geometry_hint(bs, nb_heads, max_track, last_sect);
-    if (*nb_heads != 0 && *max_track != 0 && *last_sect != 0) {
-        /* User defined disk */
-        *rate = FDRIVE_RATE_500K;
-    } else {
-        bdrv_get_geometry(bs, &nb_sectors);
-        match = -1;
-        first_match = -1;
-        for (i = 0; ; i++) {
-            parse = &fd_formats[i];
-            if (parse->drive == FDRIVE_DRV_NONE) {
+    bdrv_get_geometry(bs, &nb_sectors);
+    match = -1;
+    first_match = -1;
+    for (i = 0; ; i++) {
+        parse = &fd_formats[i];
+        if (parse->drive == FDRIVE_DRV_NONE) {
+            break;
+        }
+        if (drive_in == parse->drive ||
+            drive_in == FDRIVE_DRV_NONE) {
+            size = (parse->max_head + 1) * parse->max_track *
+                parse->last_sect;
+            if (nb_sectors == size) {
+                match = i;
                 break;
             }
-            if (drive_in == parse->drive ||
-                drive_in == FDRIVE_DRV_NONE) {
-                size = (parse->max_head + 1) * parse->max_track *
-                    parse->last_sect;
-                if (nb_sectors == size) {
-                    match = i;
-                    break;
-                }
-                if (first_match == -1) {
-                    first_match = i;
-                }
-            }
-        }
-        if (match == -1) {
             if (first_match == -1) {
-                match = 1;
-            } else {
-                match = first_match;
+                first_match = i;
             }
-            parse = &fd_formats[match];
         }
-        *nb_heads = parse->max_head + 1;
-        *max_track = parse->max_track;
-        *last_sect = parse->last_sect;
-        *drive = parse->drive;
-        *rate = parse->rate;
     }
+    if (match == -1) {
+        if (first_match == -1) {
+            match = 1;
+        } else {
+            match = first_match;
+        }
+        parse = &fd_formats[match];
+    }
+    *nb_heads = parse->max_head + 1;
+    *max_track = parse->max_track;
+    *last_sect = parse->last_sect;
+    *drive = parse->drive;
+    *rate = parse->rate;
 }
 
 int bdrv_get_translation_hint(BlockDriverState *bs)
diff --git a/hw/fdc.c b/hw/fdc.c
index 78b4e33..132b1e3 100644
--- a/hw/fdc.c
+++ b/hw/fdc.c
@@ -189,9 +189,6 @@ static void fd_revalidate(FDrive *drv)
                                       &last_sect, drv->drive, &drive, &rate);
         if (!bdrv_is_inserted(drv->bs)) {
             FLOPPY_DPRINTF("No disk in drive\n");
-        } else if (nb_heads != 0 && max_track != 0 && last_sect != 0) {
-            FLOPPY_DPRINTF("User defined disk (%d %d %d)\n",
-                           nb_heads - 1, max_track, last_sect);
         } else {
             FLOPPY_DPRINTF("Floppy disk (%d h %d t %d s) %s\n", nb_heads,
                            max_track, last_sect, ro ? "ro" : "rw");
-- 
1.7.6.5