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SubjectRe: [PATCH] tpm: tpm_crb: relinquish locality on error path.
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On Sat, 2018-04-07 at 19:12 +0300, Tomas Winkler wrote:
> In crb_map_io() function, __crb_request_locality() is called prior
> to crb_cmd_ready(), but if one of the consecutive function fails
> the flow bails out instead of trying to relinquish locality.
> This patch adds goto jump to __crb_relinquish_locality() on the error path.
>
> Fixes: 888d867df441 (tpm: cmd_ready command can be issued only after granting
> locality)
> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
> ---
> drivers/char/tpm/tpm_crb.c | 10 +++++++---
> 1 file changed, 7 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
> index 7f78482cd157..34fbc6cb097b 100644
> --- a/drivers/char/tpm/tpm_crb.c
> +++ b/drivers/char/tpm/tpm_crb.c
> @@ -511,8 +511,10 @@ static int crb_map_io(struct acpi_device *device, struct
> crb_priv *priv,
>
> priv->regs_t = crb_map_res(dev, priv, &io_res, buf->control_address,
> sizeof(struct crb_regs_tail));
> - if (IS_ERR(priv->regs_t))
> - return PTR_ERR(priv->regs_t);
> + if (IS_ERR(priv->regs_t)) {
> + ret = PTR_ERR(priv->regs_t);
> + goto out_relinquish_locality;
> + }
>
> /*
> * PTT HW bug w/a: wake up the device to access
> @@ -520,7 +522,7 @@ static int crb_map_io(struct acpi_device *device, struct
> crb_priv *priv,
> */
> ret = crb_cmd_ready(dev, priv);
> if (ret)
> - return ret;
> + goto out_relinquish_locality;
>
> pa_high = ioread32(&priv->regs_t->ctrl_cmd_pa_high);
> pa_low = ioread32(&priv->regs_t->ctrl_cmd_pa_low);
> @@ -565,6 +567,8 @@ static int crb_map_io(struct acpi_device *device, struct
> crb_priv *priv,
>
> crb_go_idle(dev, priv);
>
> +out_relinquish_locality:
> +
> __crb_relinquish_locality(dev, priv, 0);
>
> return ret;

Thanks, please just call it before returning in the error path.

/Jarkko

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