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Subject[PATCH 4.11 011/197] tpm_tis_spi: Abort transfer when too many wait states are signaled
Date
4.11-stable review patch.  If anyone has any objections, please let me know.

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

From: Peter Huewe <peter.huewe@infineon.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@infineon.com>
Signed-off-by: Peter Huewe <peter.huewe@infineon.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Benoit Houyere <benoit.houyere@st.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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;


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