Re: [Qemu-devel] [PATCH] Revert "nand: Don't inherit from Sysbus"

["Andreas Färber" <afaerber@suse.de>]

Am 05.02.2014 09:39, schrieb Markus Armbruster:
> This reverts commit 7426aa72c36c908a7d0eae3e38568bb0a70de479.
> 
> The commit goes into a sensible direction, but it violates qdev design
> assumptions.  Symptom: "info qtree" crashes for all boards including
> the device (akita, borzoi, spitz, terrier, tosa, axis-dev88).
> 
> Peter Crosthwaite is working on a fix, but it's not trivial.  Revert
> the flawed patch for now.
> 
> Signed-off-by: Markus Armbruster <armbru@redhat.com>
> Acked-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
> ---
>  hw/block/nand.c | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/hw/block/nand.c b/hw/block/nand.c
> index a871ce0..a0232d1 100644
> --- a/hw/block/nand.c
> +++ b/hw/block/nand.c
> @@ -21,7 +21,7 @@
>  # include "hw/hw.h"
>  # include "hw/block/flash.h"
>  # include "sysemu/blockdev.h"
> -#include "hw/qdev.h"
> +# include "hw/sysbus.h"
>  #include "qemu/error-report.h"
>  
>  # define NAND_CMD_READ0		0x00
> @@ -54,8 +54,7 @@
>  
>  typedef struct NANDFlashState NANDFlashState;
>  struct NANDFlashState {
> -    DeviceState parent_obj;
> -
> +    SysBusDevice busdev;

Negative on calling it busdev again, that surely has nothing to do with
a crash since it's not being used anywhere in this patch.

I still have not seen a single backtrace of what is going wrong, only
Paolo saying something about adding to main_system_bus in "the patch".
Clearly that is not in this patch! Where is that happening and why is
that so complicated for Peter C. to fix?

Andreas

>      uint8_t manf_id, chip_id;
>      uint8_t buswidth; /* in BYTES */
>      int size, pages;
> @@ -441,7 +440,7 @@ static void nand_class_init(ObjectClass *klass, void *data)
>  
>  static const TypeInfo nand_info = {
>      .name          = TYPE_NAND,
> -    .parent        = TYPE_DEVICE,
> +    .parent        = TYPE_SYS_BUS_DEVICE,
>      .instance_size = sizeof(NANDFlashState),
>      .class_init    = nand_class_init,
>  };

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