linux-kernel - [PATCH 07/15] tpm: st33: Remove chip->data

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Date:	Tue, 22 Oct 2013 20:00:32 +0200
From:	Peter Huewe <peterhuewe@....de>
To:	james.l.morris@...cle.com, tpmdd-devel@...ts.sourceforge.net,
	adlai@...ux.vnet.ibm.com
Cc:	linux-kernel@...r.kernel.org,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Mathias Leblanc <mathias.leblanc@...com>,
	Peter Huewe <peterhuewe@....de>
Subject: [PATCH 07/15] tpm: st33: Remove chip->data_buffer access from this driver

From: Jason Gunthorpe <jgunthorpe@...idianresearch.com>

For some reason this driver thinks that chip->data_buffer needs
to be set before it can call tpm_pm_*. This is not true. data_buffer
is used only by /dev/tpmX, which is why it is managed exclusively
by the fops functions.

Cc: Mathias Leblanc <mathias.leblanc@...com>
Signed-off-by: Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Reviewed-by: Joel Schopp <jschopp@...ux.vnet.ibm.com>
Signed-off-by: Peter Huewe <peterhuewe@....de>
---
 drivers/char/tpm/tpm_i2c_stm_st33.c |    8 --------
 1 files changed, 0 insertions(+), 8 deletions(-)

diff --git a/drivers/char/tpm/tpm_i2c_stm_st33.c b/drivers/char/tpm/tpm_i2c_stm_st33.c
index 1c68d93..b2390b6 100644
--- a/drivers/char/tpm/tpm_i2c_stm_st33.c
+++ b/drivers/char/tpm/tpm_i2c_stm_st33.c
@@ -805,24 +805,18 @@ static int tpm_st33_i2c_remove(struct i2c_client *client)
 #ifdef CONFIG_PM_SLEEP
 /*
  * tpm_st33_i2c_pm_suspend suspend the TPM device
- * Added: Work around when suspend and no tpm application is running, suspend
- * may fail because chip->data_buffer is not set (only set in tpm_open in Linux
- * TPM core)
  * @param: client, the i2c_client drescription (TPM I2C description).
  * @param: mesg, the power management message.
  * @return: 0 in case of success.
  */
 static int tpm_st33_i2c_pm_suspend(struct device *dev)
 {
-	struct tpm_chip *chip = dev_get_drvdata(dev);
 	struct st33zp24_platform_data *pin_infos = dev->platform_data;
 	int ret = 0;
 
 	if (power_mgt) {
 		gpio_set_value(pin_infos->io_lpcpd, 0);
 	} else {
-		if (chip->data_buffer == NULL)
-			chip->data_buffer = pin_infos->tpm_i2c_buffer[0];
 		ret = tpm_pm_suspend(dev);
 	}
 	return ret;
@@ -847,8 +841,6 @@ static int tpm_st33_i2c_pm_resume(struct device *dev)
 					  TPM_STS_VALID) == TPM_STS_VALID,
 					  chip->vendor.timeout_b);
 	} else {
-		if (chip->data_buffer == NULL)
-			chip->data_buffer = pin_infos->tpm_i2c_buffer[0];
 		ret = tpm_pm_resume(dev);
 		if (!ret)
 			tpm_do_selftest(chip);
-- 
1.7.5.4

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