linux-kernel - [PATCH v2 2/5] tpm_tis_spi: Abort transfer when too many wait states are signaled

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Date:   Thu, 2 Mar 2017 13:03:12 +0000
From:   Peter Huewe <peter.huewe@...ineon.com>
To:     <tpmdd-devel@...ts.sourceforge.net>
CC:     Peter Huewe <peter.huewe@...ineon.com>, <stable@...r.kernel.org>,
        Alexander Steffen <Alexander.Steffen@...ineon.com>,
        Peter Huewe <peterhuewe@....de>,
        Marcel Selhorst <tpmdd@...horst.net>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 2/5] tpm_tis_spi: Abort transfer when too many wait states are signaled

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.

Cc: <stable@...r.kernel.org>
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>
---
 drivers/char/tpm/tpm_tis_spi.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/char/tpm/tpm_tis_spi.c b/drivers/char/tpm/tpm_tis_spi.c
index 062799e04f04..639614f2d415 100644
--- 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 tpm_tis_data *data, u32 addr, u16 len,
 			goto exit;
 	}
 
+	if (i == TPM_RETRY) {
+		ret = -ETIMEDOUT;
+		goto exit;
+	}
+
 	spi_xfer.cs_change = 0;
 	spi_xfer.len = len;
 
-- 
2.7.4