From: Juergen Gross Date: Mon, 31 Oct 2016 13:58:40 +0000 (+0100) Subject: xen: make use of xenbus_read_unsigned() in xen-tpmfront X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=0240933469ea4cc1aa1c32867349c4aa718fe264;p=linux-beck.git xen: make use of xenbus_read_unsigned() in xen-tpmfront 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: peterhuewe@gmx.de Cc: tpmdd@selhorst.net Cc: jarkko.sakkinen@linux.intel.com Cc: jgunthorpe@obsidianresearch.com Cc: tpmdd-devel@lists.sourceforge.net Signed-off-by: Juergen Gross Reviewed-by: Jarkko Sakkinen Acked-by: David Vrabel --- diff --git a/drivers/char/tpm/xen-tpmfront.c b/drivers/char/tpm/xen-tpmfront.c index 62028f483bba..50072cc4fe5c 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;