diff options
| author | Juergen Gross <jgross@suse.com> | 2016-10-31 14:58:40 +0100 |
|---|---|---|
| committer | Juergen Gross <jgross@suse.com> | 2016-11-07 13:55:11 +0100 |
| commit | 0240933469ea4cc1aa1c32867349c4aa718fe264 (patch) | |
| tree | 2d49742a3fce70c41a68b29725053440cba4c35b /drivers | |
| parent | f27dc1ac56865c2cc43d0ec3110a2b4a95b04e1d (diff) | |
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 <jgross@suse.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Acked-by: David Vrabel <david.vrabel@citrix.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/char/tpm/xen-tpmfront.c | 8 |
1 files changed, 2 insertions, 6 deletions
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; |