linux-kernel - [PATCH 4.11 011/197] tpm_tis_spi: Abort transfer when too many wait states are signaled

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Message-Id: <20170523200822.420454309@linuxfoundation.org>
Date:   Tue, 23 May 2017 22:06:12 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Alexander Steffen <Alexander.Steffen@...ineon.com>,
        Peter Huewe <peter.huewe@...ineon.com>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Benoit Houyere <benoit.houyere@...com>
Subject: [PATCH 4.11 011/197] tpm_tis_spi: Abort transfer when too many wait states are signaled

4.11-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Peter Huewe <peter.huewe@...ineon.com>

commit 975094ddc369a32f27210248bdd9bbd153061b00 upstream.

Abort the transfer with ETIMEDOUT when the TPM signals more than
TPM_RETRY wait states. Continuing with the transfer in this state
will only lead to arbitrary failures in other parts of the code.

Fixes: 0edbfea537d1 ("tpm/tpm_tis_spi: Add support for spi phy")
Signed-off-by: Alexander Steffen <Alexander.Steffen@...ineon.com>
Signed-off-by: Peter Huewe <peter.huewe@...ineon.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Tested-by: Benoit Houyere <benoit.houyere@...com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/char/tpm/tpm_tis_spi.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/char/tpm/tpm_tis_spi.c
+++ b/drivers/char/tpm/tpm_tis_spi.c
@@ -101,6 +101,11 @@ static int tpm_tis_spi_transfer(struct t
 			goto exit;
 	}
 
+	if (i == TPM_RETRY) {
+		ret = -ETIMEDOUT;
+		goto exit;
+	}
+
 	spi_xfer.cs_change = 0;
 	spi_xfer.len = len;