From afb5abc262e962089ef2d7c2bbf71bb6f53a2a78 Mon Sep 17 00:00:00 2001 From: Jarkko Sakkinen Date: Fri, 12 Dec 2014 11:46:34 -0800 Subject: tpm: two-phase chip management functions tpm_register_hardware() and tpm_remove_hardware() are called often before initializing the device. The problem is that the device might not be fully initialized when it comes visible to the user space. This patch resolves the issue by diving initialization into two parts: - tpmm_chip_alloc() creates struct tpm_chip. - tpm_chip_register() sets up the character device and sysfs attributes. The framework takes care of freeing struct tpm_chip by using the devres API. The broken release callback has been wiped. ACPI drivers do not ever get this callback. Regards to Jason Gunthorpe for carefully reviewing this part of the code. Signed-off-by: Jarkko Sakkinen Reviewed-by: Jasob Gunthorpe Reviewed-by: Stefan Berger Tested-by: Scot Doyle Tested-by: Peter Huewe [phuewe: update to upstream changes] Signed-off-by: Peter Huewe --- drivers/char/tpm/tpm_nsc.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) (limited to 'drivers/char/tpm/tpm_nsc.c') diff --git a/drivers/char/tpm/tpm_nsc.c b/drivers/char/tpm/tpm_nsc.c index 4d0a17ea8cde..6e2c2e64b292 100644 --- a/drivers/char/tpm/tpm_nsc.c +++ b/drivers/char/tpm/tpm_nsc.c @@ -247,10 +247,9 @@ static struct platform_device *pdev = NULL; static void tpm_nsc_remove(struct device *dev) { struct tpm_chip *chip = dev_get_drvdata(dev); - if ( chip ) { - release_region(chip->vendor.base, 2); - tpm_remove_hardware(chip->dev); - } + + tpm_chip_unregister(chip); + release_region(chip->vendor.base, 2); } static SIMPLE_DEV_PM_OPS(tpm_nsc_pm, tpm_pm_suspend, tpm_pm_resume); @@ -307,11 +306,16 @@ static int __init init_nsc(void) goto err_del_dev; } - if (!(chip = tpm_register_hardware(&pdev->dev, &tpm_nsc))) { + chip = tpmm_chip_alloc(&pdev->dev, &tpm_nsc); + if (IS_ERR(chip)) { rc = -ENODEV; goto err_rel_reg; } + rc = tpm_chip_register(chip); + if (rc) + goto err_rel_reg; + dev_dbg(&pdev->dev, "NSC TPM detected\n"); dev_dbg(&pdev->dev, "NSC LDN 0x%x, SID 0x%x, SRID 0x%x\n", -- cgit