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29 July 2024, 15:18:00 UTC
Revision 7862840219058436b80029a0263fd1ef065fb1b3 authored by James Bottomley on 28 May 2020, 18:10:57 UTC, committed by Jarkko Sakkinen on 02 July 2020, 14:48:59 UTC 
tpm: Fix TIS locality timeout problems
 
It has been reported that some TIS based TPMs are giving unexpected
errors when using the O_NONBLOCK path of the TPM device. The problem
is that some TPMs don't like it when you get and then relinquish a
locality (as the tpm_try_get_ops()/tpm_put_ops() pair does) without
sending a command.  This currently happens all the time in the
O_NONBLOCK write path. Fix this by moving the tpm_try_get_ops()
further down the code to after the O_NONBLOCK determination is made.
This is safe because the priv->buffer_mutex still protects the priv
state being modified.

BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=206275
Fixes: d23d12484307 ("tpm: fix invalid locking in NONBLOCKING mode")
Reported-by: Mario Limonciello <Mario.Limonciello@dell.com>
Tested-by: Alex Guzman <alex@guzman.io>
Cc: stable@vger.kernel.org
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
1 parent cd77006
History
Tip revision: 7862840219058436b80029a0263fd1ef065fb1b3 authored by James Bottomley on 28 May 2020, 18:10:57 UTC
tpm: Fix TIS locality timeout problems
Tip revision: 7862840
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