[Qemu-devel] [PATCH v2 for-2.3 1/5] hw: Mark devices picking up block backends actively FIXME

[Markus Armbruster <armbru@redhat.com>]

Drives defined with if!=none are for board initialization to wire up.
Board code calls drive_get() or similar to find them, and creates
devices with their qdev drive properties set accordingly.

Except a few devices go on a fishing expedition for a suitable backend
instead of exposing a drive property for board code to set: they call
driver_get() or drive_get_next() in their realize() or init() method
to implicitly connect to the "next" backend with a certain interface
type.

Picking up backends that way works when the devices are created by
board code.  But it's inappropriate for -device or device_add.  Not
only is this inconsistent with how the other block device models work
(they connect to a backend explicitly identified by a "drive"
property), it breaks when the "next" backend has been picked up by the
board already.

Example:

    $ qemu-system-arm -S -M connex -pflash flash.img -device ssi-sd
    Aborted (core dumped)

Mark them with suitable FIXME comments.

Cc: Andrzej Zaborowski <balrogg@gmail.com>
Cc: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Cc: "Andreas Färber" <andreas.faerber@web.de>
Cc: Michael Walle <michael@walle.cc>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
---
 hw/arm/spitz.c            | 1 +
 hw/block/m25p80.c         | 1 +
 hw/isa/pc87312.c          | 2 ++
 hw/sd/milkymist-memcard.c | 1 +
 hw/sd/pl181.c             | 1 +
 hw/sd/sdhci.c             | 1 +
 hw/sd/ssi-sd.c            | 1 +
 7 files changed, 8 insertions(+)

diff --git a/hw/arm/spitz.c b/hw/arm/spitz.c
index a16831c..da02932 100644
--- a/hw/arm/spitz.c
+++ b/hw/arm/spitz.c
@@ -168,6 +168,7 @@ static int sl_nand_init(SysBusDevice *dev)
     DriveInfo *nand;
 
     s->ctl = 0;
+    /* FIXME use a qdev drive property instead of drive_get() */
     nand = drive_get(IF_MTD, 0, 0);
     s->nand = nand_init(nand ? blk_by_legacy_dinfo(nand) : NULL,
                         s->manf_id, s->chip_id);
diff --git a/hw/block/m25p80.c b/hw/block/m25p80.c
index ff1106b..afe243b 100644
--- a/hw/block/m25p80.c
+++ b/hw/block/m25p80.c
@@ -623,6 +623,7 @@ static int m25p80_init(SSISlave *ss)
     s->dirty_page = -1;
     s->storage = blk_blockalign(s->blk, s->size);
 
+    /* FIXME use a qdev drive property instead of drive_get_next() */
     dinfo = drive_get_next(IF_MTD);
 
     if (dinfo) {
diff --git a/hw/isa/pc87312.c b/hw/isa/pc87312.c
index 40a1106..2849e8d 100644
--- a/hw/isa/pc87312.c
+++ b/hw/isa/pc87312.c
@@ -319,11 +319,13 @@ static void pc87312_realize(DeviceState *dev, Error **errp)
         d = DEVICE(isa);
         qdev_prop_set_uint32(d, "iobase", get_fdc_iobase(s));
         qdev_prop_set_uint32(d, "irq", 6);
+        /* FIXME use a qdev drive property instead of drive_get() */
         drive = drive_get(IF_FLOPPY, 0, 0);
         if (drive != NULL) {
             qdev_prop_set_drive_nofail(d, "driveA",
                                        blk_by_legacy_dinfo(drive));
         }
+        /* FIXME use a qdev drive property instead of drive_get() */
         drive = drive_get(IF_FLOPPY, 0, 1);
         if (drive != NULL) {
             qdev_prop_set_drive_nofail(d, "driveB",
diff --git a/hw/sd/milkymist-memcard.c b/hw/sd/milkymist-memcard.c
index 9661eaf..0cc53d9 100644
--- a/hw/sd/milkymist-memcard.c
+++ b/hw/sd/milkymist-memcard.c
@@ -255,6 +255,7 @@ static int milkymist_memcard_init(SysBusDevice *dev)
     DriveInfo *dinfo;
     BlockBackend *blk;
 
+    /* FIXME use a qdev drive property instead of drive_get_next() */
     dinfo = drive_get_next(IF_SD);
     blk = dinfo ? blk_by_legacy_dinfo(dinfo) : NULL;
     s->card = sd_init(blk, false);
diff --git a/hw/sd/pl181.c b/hw/sd/pl181.c
index e704b6e..bf37da6 100644
--- a/hw/sd/pl181.c
+++ b/hw/sd/pl181.c
@@ -490,6 +490,7 @@ static int pl181_init(SysBusDevice *sbd)
     sysbus_init_irq(sbd, &s->irq[0]);
     sysbus_init_irq(sbd, &s->irq[1]);
     qdev_init_gpio_out(dev, s->cardstatus, 2);
+    /* FIXME use a qdev drive property instead of drive_get_next() */
     dinfo = drive_get_next(IF_SD);
     s->card = sd_init(dinfo ? blk_by_legacy_dinfo(dinfo) : NULL, false);
     if (s->card == NULL) {
diff --git a/hw/sd/sdhci.c b/hw/sd/sdhci.c
index 27b914a..f056c52 100644
--- a/hw/sd/sdhci.c
+++ b/hw/sd/sdhci.c
@@ -1146,6 +1146,7 @@ static void sdhci_initfn(SDHCIState *s)
 {
     DriveInfo *di;
 
+    /* FIXME use a qdev drive property instead of drive_get_next() */
     di = drive_get_next(IF_SD);
     s->card = sd_init(di ? blk_by_legacy_dinfo(di) : NULL, false);
     if (s->card == NULL) {
diff --git a/hw/sd/ssi-sd.c b/hw/sd/ssi-sd.c
index a71fbca..e4b2d4f 100644
--- a/hw/sd/ssi-sd.c
+++ b/hw/sd/ssi-sd.c
@@ -255,6 +255,7 @@ static int ssi_sd_init(SSISlave *d)
     DriveInfo *dinfo;
 
     s->mode = SSI_SD_CMD;
+    /* FIXME use a qdev drive property instead of drive_get_next() */
     dinfo = drive_get_next(IF_SD);
     s->sd = sd_init(dinfo ? blk_by_legacy_dinfo(dinfo) : NULL, true);
     if (s->sd == NULL) {
-- 
1.9.3