From 01f54664a4db0d612de0ece8e0022f21f9374e9b Mon Sep 17 00:00:00 2001 From: Tomas Winkler Date: Tue, 16 Oct 2018 16:37:16 +0300 Subject: tpm: tpm_try_transmit() refactor error flow. First, rename out_no_locality to out_locality for bailing out on both tpm_cmd_ready() and tpm_request_locality() failure. Second, ignore the return value of go_to_idle() as it may override the return value of the actual tpm operation, the go_to_idle() error will be caught on any consequent command. Last, fix the wrong 'goto out', that jumped back instead of forward. Cc: stable@vger.kernel.org Fixes: 627448e85c76 ("tpm: separate cmd_ready/go_idle from runtime_pm") Signed-off-by: Tomas Winkler Reviewed-by: Jarkko Sakkinen Tested-by: Jarkko Sakkinen Signed-off-by: Jarkko Sakkinen --- drivers/char/tpm/tpm-interface.c | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-) (limited to 'drivers/char/tpm') diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c index 1ba033b13ab2..d9439f9abe78 100644 --- a/drivers/char/tpm/tpm-interface.c +++ b/drivers/char/tpm/tpm-interface.c @@ -212,13 +212,15 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip, if (need_locality) { rc = tpm_request_locality(chip, flags); - if (rc < 0) - goto out_no_locality; + if (rc < 0) { + need_locality = false; + goto out_locality; + } } rc = tpm_cmd_ready(chip, flags); if (rc) - goto out; + goto out_locality; rc = tpm2_prepare_space(chip, space, ordinal, buf); if (rc) @@ -279,14 +281,13 @@ out_recv: dev_err(&chip->dev, "tpm2_commit_space: error %d\n", rc); out: - rc = tpm_go_idle(chip, flags); - if (rc) - goto out; + /* may fail but do not override previous error value in rc */ + tpm_go_idle(chip, flags); +out_locality: if (need_locality) tpm_relinquish_locality(chip, flags); -out_no_locality: if (chip->ops->clk_enable != NULL) chip->ops->clk_enable(chip, false); -- cgit v1.2.3