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Date: Sun, 8 Nov 2015 09:51:07 +0200 From: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com> To: Peter Huewe <peterhuewe@....de>, Marcel Selhorst <tpmdd@...horst.net> Cc: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>, Jason Gunthorpe <jgunthorpe@...idianresearch.com>, tpmdd-devel@...ts.sourceforge.net (moderated list:TPM DEVICE DRIVER), linux-kernel@...r.kernel.org (open list) Subject: [PATCH] tpm: fix compat 'ppi' link handling in tpm_chip_register() __compat_only_sysfs_link_entry_to_kobj() was unconditionally called for TPM1 chips, which caused crash on Acer C720 laptop where DSM for the ACPI object did not exist. There are two reasons for unwanted behavior: * The code did not check whether __compat_only_sysfs_link_entry_to_kobj() returned -ENOENT. This is OK. It just meanst that ppi is not available. * The code did not clean up properly. Compat link should added only after all other init is done. This patch sorts out these issues. Fixes: 9b774d5cf2db Reported-by: Jeremiah Mahler <jmmahler@...il.com> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com> Tested-by: Jeremiah Mahler <jmmahler@...il.com> --- drivers/char/tpm/tpm-chip.c | 18 ++++++++++-------- 1 file changed, 10 insertions(+), 8 deletions(-) diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c index a5cdce7..45cc39a 100644 --- a/drivers/char/tpm/tpm-chip.c +++ b/drivers/char/tpm/tpm-chip.c @@ -226,14 +226,6 @@ int tpm_chip_register(struct tpm_chip *chip) if (rc) goto out_err; - if (!(chip->flags & TPM_CHIP_FLAG_TPM2)) { - rc = __compat_only_sysfs_link_entry_to_kobj(&chip->pdev->kobj, - &chip->dev.kobj, - "ppi"); - if (rc) - goto out_err; - } - /* Make the chip available. */ spin_lock(&driver_lock); list_add_tail_rcu(&chip->list, &tpm_chip_list); @@ -241,6 +233,16 @@ int tpm_chip_register(struct tpm_chip *chip) chip->flags |= TPM_CHIP_FLAG_REGISTERED; + if (!(chip->flags & TPM_CHIP_FLAG_TPM2)) { + rc = __compat_only_sysfs_link_entry_to_kobj(&chip->pdev->kobj, + &chip->dev.kobj, + "ppi"); + if (rc && rc != -ENOENT) { + tpm_chip_unregister(chip); + return rc; + } + } + return 0; out_err: tpm1_chip_unregister(chip); -- 2.5.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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