linux-kernel - [PATCH v9 06/12] tpm, tpm_tis: Move interrupt mask checks into own function

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20221110152533.24243-7-LinoSanfilippo@gmx.de>
Date:   Thu, 10 Nov 2022 16:25:27 +0100
From:   Lino Sanfilippo <LinoSanfilippo@....de>
To:     peterhuewe@....de, jarkko@...nel.org, jgg@...pe.ca
Cc:     stefanb@...ux.vnet.ibm.com, linux@...ewoehner.de,
        linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        jandryuk@...il.com, pmenzel@...gen.mpg.de, l.sanfilippo@...bus.com,
        LinoSanfilippo@....de, lukas@...ner.de, p.rosenberger@...bus.com
Subject: [PATCH v9 06/12] tpm, tpm_tis: Move interrupt mask checks into own function

From: Lino Sanfilippo <l.sanfilippo@...bus.com>

Clean up wait_for_tpm_stat() by moving multiple similar interrupt mask
checks into an own function.

Signed-off-by: Lino Sanfilippo <l.sanfilippo@...bus.com>
Suggested-by: Jarkko Sakkinen <jarkko@...nel.org>
Reviewed-by: Jarkko Sakkinen <jarkko@...nel.org>
---
 drivers/char/tpm/tpm_tis_core.c | 29 ++++++++++++++++++-----------
 1 file changed, 18 insertions(+), 11 deletions(-)

diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_core.c
index d07debc3182c..181c291b0bb8 100644
--- a/drivers/char/tpm/tpm_tis_core.c
+++ b/drivers/char/tpm/tpm_tis_core.c
@@ -44,6 +44,20 @@ static bool wait_for_tpm_stat_cond(struct tpm_chip *chip, u8 mask,
 	return false;
 }
 
+static u8 tpm_tis_filter_sts_mask(u8 int_mask, u8 sts_mask)
+{
+	if (!(int_mask & TPM_INTF_STS_VALID_INT))
+		sts_mask &= ~TPM_STS_VALID;
+
+	if (!(int_mask & TPM_INTF_DATA_AVAIL_INT))
+		sts_mask &= ~TPM_STS_DATA_AVAIL;
+
+	if (!(int_mask & TPM_INTF_CMD_READY_INT))
+		sts_mask &= ~TPM_STS_COMMAND_READY;
+
+	return sts_mask;
+}
+
 static int wait_for_tpm_stat(struct tpm_chip *chip, u8 mask,
 		unsigned long timeout, wait_queue_head_t *queue,
 		bool check_cancel)
@@ -53,7 +67,7 @@ static int wait_for_tpm_stat(struct tpm_chip *chip, u8 mask,
 	long rc;
 	u8 status;
 	bool canceled = false;
-	u8 sts_mask = 0;
+	u8 sts_mask;
 	int ret = 0;
 
 	/* check current status */
@@ -61,17 +75,10 @@ static int wait_for_tpm_stat(struct tpm_chip *chip, u8 mask,
 	if ((status & mask) == mask)
 		return 0;
 
+	sts_mask = mask & (TPM_STS_VALID | TPM_STS_DATA_AVAIL |
+			   TPM_STS_COMMAND_READY);
 	/* check what status changes can be handled by irqs */
-	if (priv->int_mask & TPM_INTF_STS_VALID_INT)
-		sts_mask |= TPM_STS_VALID;
-
-	if (priv->int_mask & TPM_INTF_DATA_AVAIL_INT)
-		sts_mask |= TPM_STS_DATA_AVAIL;
-
-	if (priv->int_mask & TPM_INTF_CMD_READY_INT)
-		sts_mask |= TPM_STS_COMMAND_READY;
-
-	sts_mask &= mask;
+	sts_mask = tpm_tis_filter_sts_mask(priv->int_mask, sts_mask);
 
 	stop = jiffies + timeout;
 	/* process status changes with irq support */
-- 
2.36.1