From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D4BA430FA4 for ; Wed, 20 Sep 2023 12:21:24 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 554CEC433C7; Wed, 20 Sep 2023 12:21:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1695212484; bh=4ELIotB98orVCB9Y6MwQIm6tvFMZdGqaNDsUQBC/SJo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OQA2wyjTSc39mblLn7W5+qhhuXCa8mvlhsLBDztrhIWhZiJFkIdQ8fG5kTjN7/UZT JPc5tYjZZPPKimuPwlrGcfS0m1JY5Q0lIPpAks6UyIBGmJXHXGPDnMqBoZ/yxprsbe y64WSfiG9mEM4vTRcw5s7tv3W70aCp/rnmtr3Dog= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Alexander Steffen , Jarkko Sakkinen , Sasha Levin Subject: [PATCH 5.10 19/83] tpm_tis: Resend command to recover from data transfer errors Date: Wed, 20 Sep 2023 13:31:09 +0200 Message-ID: <20230920112827.434708860@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20230920112826.634178162@linuxfoundation.org> References: <20230920112826.634178162@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Alexander Steffen [ Upstream commit 280db21e153d8810ce3b93640c63ae922bcb9e8e ] Similar to the transmission of TPM responses, also the transmission of TPM commands may become corrupted. Instead of aborting when detecting such issues, try resending the command again. Signed-off-by: Alexander Steffen Reviewed-by: Jarkko Sakkinen Signed-off-by: Jarkko Sakkinen Signed-off-by: Sasha Levin --- drivers/char/tpm/tpm_tis_core.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c index d7c440ac465f3..b3452259d6e0b 100644 --- a/drivers/char/tpm/tpm_tis_core.c +++ b/drivers/char/tpm/tpm_tis_core.c @@ -469,10 +469,17 @@ static int tpm_tis_send_main(struct tpm_chip *chip, const u8 *buf, size_t len) int rc; u32 ordinal; unsigned long dur; - - rc = tpm_tis_send_data(chip, buf, len); - if (rc < 0) - return rc; + unsigned int try; + + for (try = 0; try < TPM_RETRY; try++) { + rc = tpm_tis_send_data(chip, buf, len); + if (rc >= 0) + /* Data transfer done successfully */ + break; + else if (rc != -EIO) + /* Data transfer failed, not recoverable */ + return rc; + } /* go and do it */ rc = tpm_tis_write8(priv, TPM_STS(priv->locality), TPM_STS_GO); -- 2.40.1