On Mon, Oct 31, 2016 at 05:48:22PM +0100, Juergen Gross wrote:
> Use xenbus_read_unsigned() instead of xenbus_scanf() when possible.
> This requires to change the type of one read from int to unsigned,
> but this case has been wrong before: negative values are not allowed
> for the modified case.
>
> Cc: peterhu...@gmx.de
> Cc: tp...@selhorst.net
> Cc: jarkko.sakki...@linux.intel.com
> Cc: jguntho...@obsidianresearch.com
> Cc: tpmdd-de...@lists.sourceforge.net
>
> Signed-off-by: Juergen Gross <jgr...@suse.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakki...@linux.intel.com>
/Jarkko
> ---
> drivers/char/tpm/xen-tpmfront.c | 8 ++------
> 1 file changed, 2 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/char/tpm/xen-tpmfront.c b/drivers/char/tpm/xen-tpmfront.c
> index 62028f4..50072cc 100644
> --- a/drivers/char/tpm/xen-tpmfront.c
> +++ b/drivers/char/tpm/xen-tpmfront.c
> @@ -337,18 +337,14 @@ static int tpmfront_resume(struct xenbus_device *dev)
> static void backend_changed(struct xenbus_device *dev,
> enum xenbus_state backend_state)
> {
> - int val;
> -
> switch (backend_state) {
> case XenbusStateInitialised:
> case XenbusStateConnected:
> if (dev->state == XenbusStateConnected)
> break;
>
> - if (xenbus_scanf(XBT_NIL, dev->otherend,
> - "feature-protocol-v2", "%d", &val) < 0)
> - val = 0;
> - if (!val) {
> + if (!xenbus_read_unsigned(dev->otherend, "feature-protocol-v2",
> + 0)) {
> xenbus_dev_fatal(dev, -EINVAL,
> "vTPM protocol 2 required");
> return;
> --
> 2.6.6
>
