Re: [Qemu-devel] [Qemu-trivial] [PATCH 1/2] pc_sysfw: Check for qemu_find_file() failure

[Stefan Hajnoczi <stefanha@gmail.com>]

On Fri, Nov 23, 2012 at 07:12:17PM +0100, Markus Armbruster wrote:
> diff --git a/hw/pc_sysfw.c b/hw/pc_sysfw.c
> index 9d7c5f4..066c4fe 100644
> --- a/hw/pc_sysfw.c
> +++ b/hw/pc_sysfw.c
> @@ -84,6 +84,11 @@ static void pc_fw_add_pflash_drv(void)
>          bios_name = BIOS_FILENAME;
>      }
>      filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
> +    if (!filename) {
> +        error_report("Can't open BIOS image %s: %s",
> +                     bios_name, strerror(errno));

qemu_find_file() does not document that errno is set when returning
NULL.  I can't find other callers to qemu_find_file() that use errno
either.

Please add a doc comment to qemu_find_file() that errno will be set on
NULL return, otherwise we can't rely on it in the caller.

Stefan