Re: [PATCH 1/2] xen-tpmfront: Use common error handling code in vtpm_send()

Jarkko Sakkinen
2017-10-23T13:43:03Z

On Sun, Oct 22, 2017 at 01:29:33PM +0200, SF Markus Elfring wrote:
> From: Markus Elfring <elfring@users.sourceforge.net>
> Date: Sun, 22 Oct 2017 12:56:42 +0200
>
> Add a jump target so that a bit of exception handling can be better reused
> at the end of this function.
>
> This issue was detected by using the Coccinelle software.
>
> Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
> ---
> drivers/char/tpm/xen-tpmfront.c | 13 +++++++------
> 1 file changed, 7 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/char/tpm/xen-tpmfront.c b/drivers/char/tpm/xen-tpmfront.c
> index 656e8af95d52..873a5631937a 100644
> --- a/drivers/char/tpm/xen-tpmfront.c
> +++ b/drivers/char/tpm/xen-tpmfront.c
> @@ -90,10 +90,8 @@ static int vtpm_send(struct tpm_chip *chip, u8 *buf, size_t count)
>
> /* Wait for completion of any existing command or cancellation */
> if (wait_for_tpm_stat(chip, VTPM_STATUS_IDLE, chip->timeout_c,
> - &priv->read_queue, true) < 0) {
> - vtpm_cancel(chip);
> - return -ETIME;
> - }
> + &priv->read_queue, true) < 0)
> + goto cancel_vtpm;
>
> memcpy(offset + (u8 *)shr, buf, count);
> shr->length = count;
> @@ -108,11 +106,14 @@ static int vtpm_send(struct tpm_chip *chip, u8 *buf, size_t count)
> if (wait_for_tpm_stat(chip, VTPM_STATUS_IDLE, duration,
> &priv->read_queue, true) < 0) {
> /* got a signal or timeout, try to cancel */
> - vtpm_cancel(chip);
> - return -ETIME;
> + goto cancel_vtpm;
> }
>
> return count;
> +
> +cancel_vtpm:
> + vtpm_cancel(chip);
> + return -ETIME;
> }
>
> static int vtpm_recv(struct tpm_chip *chip, u8 *buf, size_t count)
> --
> 2.14.2
>

NAK

/Jarkko