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Date: Thu, 23 Mar 2017 23:36:16 +0200
From: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To: Stephen Rothwell <sfr@...b.auug.org.au>
Cc: Greg KH <greg@...ah.com>, Arnd Bergmann <arnd@...db.de>,
linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
Logan Gunthorpe <logang@...tatee.com>,
James Bottomley <James.Bottomley@...senPartnership.com>,
Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Subject: Re: linux-next: manual merge of the char-misc tree with the tpmdd
tree
On Wed, Mar 22, 2017 at 01:13:19PM +1100, Stephen Rothwell wrote:
> Hi all,
>
> Today's linux-next merge of the char-misc tree got a conflict in:
>
> drivers/char/tpm/tpm-chip.c
>
> between commit:
>
> d7a97c3e6592 ("tpm: Use the right clean up after cdev_add completes")
I don't think this fix is critical so I could just drop this from my
tree and send it in a separate PR after security/next is synced with
the change mentioned below.
That said, I dropped it.
> 5f6b4fbc12c8 ("tpm: infrastructure for TPM spaces")
> 1b50e13284d7 ("tpm: expose spaces via a device link /dev/tpmrm<n>")
> 849246e7ce9c ("tpm2: add session handle context saving and restoring to the space code")
>
> from the tpmdd tree and commits:
>
> 8dbbf5825181 ("tpm-chip: utilize new cdev_device_add helper function")
>
> from the char-misc tree.
>
> I fixed it up (I hope, see below) and can carry the fix as necessary.
> This is now fixed as far as linux-next is concerned, but any non trivial
> conflicts should be mentioned to your upstream maintainer when your tree
> is submitted for merging. You may also want to consider cooperating
> with the maintainer of the conflicting tree to minimise any particularly
> complex conflicts.
>
> --
> Cheers,
> Stephen Rothwell
Thank you. I will keep this in mind.
/Jarkko
> diff --cc drivers/char/tpm/tpm-chip.c
> index 27a76e706cfd,935f0e92ad61..000000000000
> --- a/drivers/char/tpm/tpm-chip.c
> +++ b/drivers/char/tpm/tpm-chip.c
> @@@ -214,22 -186,7 +214,20 @@@ struct tpm_chip *tpm_chip_alloc(struct
> chip->flags |= TPM_CHIP_FLAG_VIRTUAL;
>
> cdev_init(&chip->cdev, &tpm_fops);
> + cdev_init(&chip->cdevs, &tpmrm_fops);
> chip->cdev.owner = THIS_MODULE;
> + chip->cdevs.owner = THIS_MODULE;
> - chip->cdev.kobj.parent = &chip->dev.kobj;
> - chip->cdevs.kobj.parent = &chip->devs.kobj;
> +
> + chip->work_space.context_buf = kzalloc(PAGE_SIZE, GFP_KERNEL);
> + if (!chip->work_space.context_buf) {
> + rc = -ENOMEM;
> + goto out;
> + }
> + chip->work_space.session_buf = kzalloc(PAGE_SIZE, GFP_KERNEL);
> + if (!chip->work_space.session_buf) {
> + rc = -ENOMEM;
> + goto out;
> + }
>
> return chip;
>
> @@@ -269,69 -225,17 +267,44 @@@ struct tpm_chip *tpmm_chip_alloc(struc
> }
> EXPORT_SYMBOL_GPL(tpmm_chip_alloc);
>
> - static void tpm_del_char_device(struct tpm_chip *chip, bool with_device)
> ++static void tpm_del_char_device(struct tpm_chip *chip)
> +{
> - cdev_del(&chip->cdev);
> - if (with_device) {
> - device_del(&chip->dev);
> -
> - /* Make the chip unavailable. */
> - mutex_lock(&idr_lock);
> - idr_replace(&dev_nums_idr, NULL, chip->dev_num);
> - mutex_unlock(&idr_lock);
> - }
> ++ cdev_device_del(&chip->cdev, &chip->dev);
> ++
> ++ /* Make the chip unavailable. */
> ++ mutex_lock(&idr_lock);
> ++ idr_replace(&dev_nums_idr, NULL, chip->dev_num);
> ++ mutex_unlock(&idr_lock);
> +
> + /* Make the driver uncallable. */
> + down_write(&chip->ops_sem);
> + if (chip->flags & TPM_CHIP_FLAG_TPM2)
> + tpm2_shutdown(chip, TPM2_SU_CLEAR);
> + chip->ops = NULL;
> + up_write(&chip->ops_sem);
> +}
> +
> static int tpm_add_char_device(struct tpm_chip *chip)
> {
> int rc;
>
> - rc = cdev_add(&chip->cdev, chip->dev.devt, 1);
> - if (rc) {
> - dev_err(&chip->dev,
> - "unable to cdev_add() %s, major %d, minor %d, err=%d\n",
> - dev_name(&chip->dev), MAJOR(chip->dev.devt),
> - MINOR(chip->dev.devt), rc);
> - return rc;
> - }
> -
> - rc = device_add(&chip->dev);
> + rc = cdev_device_add(&chip->cdev, &chip->dev);
> if (rc) {
> dev_err(&chip->dev,
> - "unable to device_register() %s, major %d, minor %d, err=%d\n",
> + "unable to cdev_device_add() %s, major %d, minor %d, err=%d\n",
> dev_name(&chip->dev), MAJOR(chip->dev.devt),
> MINOR(chip->dev.devt), rc);
> - tpm_del_char_device(chip, false);
> + return rc;
> + }
>
> + if (chip->flags & TPM_CHIP_FLAG_TPM2)
> - rc = cdev_add(&chip->cdevs, chip->devs.devt, 1);
> ++ rc = cdev_device_add(&chip->cdevs, &chip->devs);
> + if (rc) {
> + dev_err(&chip->dev,
> - "unable to cdev_add() %s, major %d, minor %d, err=%d\n",
> ++ "unable to cdev_device_add() %s, major %d, minor %d, err=%d\n",
> + dev_name(&chip->devs), MAJOR(chip->devs.devt),
> + MINOR(chip->devs.devt), rc);
> - tpm_del_char_device(chip, true);
> - return rc;
> - }
> -
> - if (chip->flags & TPM_CHIP_FLAG_TPM2)
> - rc = device_add(&chip->devs);
> - if (rc) {
> - dev_err(&chip->dev,
> - "unable to device_register() %s, major %d, minor %d, err=%d\n",
> - dev_name(&chip->devs), MAJOR(chip->devs.devt),
> - MINOR(chip->devs.devt), rc);
> - cdev_del(&chip->cdevs);
> - tpm_del_char_device(chip, true);
> ++ tpm_del_char_device(chip);
> return rc;
> }
>
> @@@ -450,10 -371,6 +423,8 @@@ void tpm_chip_unregister(struct tpm_chi
> {
> tpm_del_legacy_sysfs(chip);
> tpm_bios_log_teardown(chip);
> - if (chip->flags & TPM_CHIP_FLAG_TPM2) {
> - cdev_del(&chip->cdevs);
> - device_del(&chip->devs);
> - }
> - tpm_del_char_device(chip, true);
> ++ if (chip->flags & TPM_CHIP_FLAG_TPM2)
> ++ cdev_device_del(&chip->cdevs, &chip->devs);
> + tpm_del_char_device(chip);
> }
> EXPORT_SYMBOL_GPL(tpm_chip_unregister);
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