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From:   Sasha Levin <sashal@kernel.org>
To:     stable@vger.kernel.org, linux-kernel@vger.kernel.org
Cc:     "Winkler, Tomas" <tomas.winkler@intel.com>,
        Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH AUTOSEL 4.14 28/46] tpm: tpm_crb: relinquish locality on error path.
Date:   Thu, 25 Oct 2018 10:10:35 -0400
Message-Id: <20181025141053.213330-28-sashal@kernel.org>
In-Reply-To: <20181025141053.213330-1-sashal@kernel.org>
References: <20181025141053.213330-1-sashal@kernel.org>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

From: "Winkler, Tomas" <tomas.winkler@intel.com>

[ Upstream commit 1fbad3028664e114d210dc65d768947a3a553eaa ]

In crb_map_io() function, __crb_request_locality() is called prior
to crb_cmd_ready(), but if one of the consecutive function fails
the flow bails out instead of trying to relinquish locality.
This patch adds goto jump to __crb_relinquish_locality() on the error path.

Fixes: 888d867df441 (tpm: cmd_ready command can be issued only after granting locality)
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/char/tpm/tpm_crb.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
index 5c7ce5aaaf6f..b4ad169836e9 100644
--- a/drivers/char/tpm/tpm_crb.c
+++ b/drivers/char/tpm/tpm_crb.c
@@ -520,8 +520,10 @@ static int crb_map_io(struct acpi_device *device, struct crb_priv *priv,
 
 	priv->regs_t = crb_map_res(dev, priv, &io_res, buf->control_address,
 				   sizeof(struct crb_regs_tail));
-	if (IS_ERR(priv->regs_t))
-		return PTR_ERR(priv->regs_t);
+	if (IS_ERR(priv->regs_t)) {
+		ret = PTR_ERR(priv->regs_t);
+		goto out_relinquish_locality;
+	}
 
 	/*
 	 * PTT HW bug w/a: wake up the device to access
@@ -529,7 +531,7 @@ static int crb_map_io(struct acpi_device *device, struct crb_priv *priv,
 	 */
 	ret = __crb_cmd_ready(dev, priv);
 	if (ret)
-		return ret;
+		goto out_relinquish_locality;
 
 	pa_high = ioread32(&priv->regs_t->ctrl_cmd_pa_high);
 	pa_low  = ioread32(&priv->regs_t->ctrl_cmd_pa_low);
@@ -574,6 +576,8 @@ static int crb_map_io(struct acpi_device *device, struct crb_priv *priv,
 
 	__crb_go_idle(dev, priv);
 
+out_relinquish_locality:
+
 	__crb_relinquish_locality(dev, priv, 0);
 
 	return ret;
-- 
2.17.1