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| author | Dr. Greg Wettstein <greg@wind.enjellic.com> | 2018-09-18 00:53:33 +0200 |
|---|---|---|
| committer | Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> | 2018-10-05 12:47:34 +0200 |
| commit | e487a0f52301293152a6f8c4e217f2a11dd808e3 (patch) | |
| tree | 07d7b4bed9d8f9c7a24f8a88cb29364048c55cd6 /drivers/char/tpm | |
| parent | tpm: add support for nonblocking operation (diff) | |
| download | linux-e487a0f52301293152a6f8c4e217f2a11dd808e3.tar.xz linux-e487a0f52301293152a6f8c4e217f2a11dd808e3.zip | |
tpm: Restore functionality to xen vtpm driver.
Functionality of the xen-tpmfront driver was lost secondary to
the introduction of xenbus multi-page support in commit ccc9d90a9a8b
("xenbus_client: Extend interface to support multi-page ring").
In this commit pointer to location of where the shared page address
is stored was being passed to the xenbus_grant_ring() function rather
then the address of the shared page itself. This resulted in a situation
where the driver would attach to the vtpm-stubdom but any attempt
to send a command to the stub domain would timeout.
A diagnostic finding for this regression is the following error
message being generated when the xen-tpmfront driver probes for a
device:
<3>vtpm vtpm-0: tpm_transmit: tpm_send: error -62
<3>vtpm vtpm-0: A TPM error (-62) occurred attempting to determine
the timeouts
This fix is relevant to all kernels from 4.1 forward which is the
release in which multi-page xenbus support was introduced.
Daniel De Graaf formulated the fix by code inspection after the
regression point was located.
Fixes: ccc9d90a9a8b ("xenbus_client: Extend interface to support multi-page ring")
Signed-off-by: Dr. Greg Wettstein <greg@enjellic.com>
[boris: Updated commit message, added Fixes tag]
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: stable@vger.kernel.org # v4.1+
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Diffstat (limited to 'drivers/char/tpm')
| -rw-r--r-- | drivers/char/tpm/xen-tpmfront.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/char/tpm/xen-tpmfront.c b/drivers/char/tpm/xen-tpmfront.c index 911475d36800..b150f87f38f5 100644 --- a/drivers/char/tpm/xen-tpmfront.c +++ b/drivers/char/tpm/xen-tpmfront.c @@ -264,7 +264,7 @@ static int setup_ring(struct xenbus_device *dev, struct tpm_private *priv) return -ENOMEM; } - rv = xenbus_grant_ring(dev, &priv->shr, 1, &gref); + rv = xenbus_grant_ring(dev, priv->shr, 1, &gref); if (rv < 0) return rv; |