linux-kernel - [PATCH 1/3] tpm: Hold the kref during tpm_chip_find

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Date:	Fri, 12 Feb 2016 17:04:29 -0700
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
	tpmdd-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Cc:	Stefan Berger <stefanb@...ibm.com>, Peter Huewe <peterhuewe@....de>
Subject: [PATCH 1/3] tpm: Hold the kref during tpm_chip_find_get

This was missed during the struct device conversion, we
need to hold a kref on the chip to make sure it isn't freed.

Signed-off-by: Jason Gunthorpe <jgunthorpe@...idianresearch.com>
---
 drivers/char/tpm/tpm-chip.c | 2 ++
 drivers/char/tpm/tpm.h      | 1 +
 2 files changed, 3 insertions(+)

diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index 45cc39aabeee..ae2fed8a162b 100644
--- a/drivers/char/tpm/tpm-chip.c
+++ b/drivers/char/tpm/tpm-chip.c
@@ -53,6 +53,8 @@ struct tpm_chip *tpm_chip_find_get(int chip_num)
 			chip = pos;
 			break;
 		}
+
+		get_device(&chip->dev);
 	}
 	rcu_read_unlock();
 	return chip;
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 542a80cbfd9c..f6ba79d91857 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -207,6 +207,7 @@ struct tpm_chip {
 static inline void tpm_chip_put(struct tpm_chip *chip)
 {
 	module_put(chip->pdev->driver->owner);
+	put_device(&chip->dev);
 }
 
 static inline int tpm_read_index(int base, int index)
-- 
2.1.4