[tpmdd-devel,v4,6/8] tpm: remove printk error messages

This patch removes the unnecessary messages for failure to allocate
memory. It also replaces pr_err/printk with dev_dbg.

Suggested-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Nayna Jain <nayna@linux.vnet.ibm.com>
---
 drivers/char/tpm/tpm_acpi.c | 17 +++++------------
 drivers/char/tpm/tpm_of.c   | 26 ++++++++++----------------
 2 files changed, 15 insertions(+), 28 deletions(-)

Hi,

Does this patch (v4 6/8) and next patch (v4 7/8) looks fine ?

Thanks & Regards,
    - Nayna

On 09/28/2016 02:04 PM, Nayna Jain wrote:
> This patch removes the unnecessary messages for failure to allocate
> memory. It also replaces pr_err/printk with dev_dbg.
>
> Suggested-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
> Signed-off-by: Nayna Jain <nayna@linux.vnet.ibm.com>
> ---
>   drivers/char/tpm/tpm_acpi.c | 17 +++++------------
>   drivers/char/tpm/tpm_of.c   | 26 ++++++++++----------------
>   2 files changed, 15 insertions(+), 28 deletions(-)
>
> diff --git a/drivers/char/tpm/tpm_acpi.c b/drivers/char/tpm/tpm_acpi.c
> index 859bdba..22e42da 100644
> --- a/drivers/char/tpm/tpm_acpi.c
> +++ b/drivers/char/tpm/tpm_acpi.c
> @@ -60,11 +60,8 @@ int read_log_acpi(struct tpm_chip *chip)
>   	status = acpi_get_table(ACPI_SIG_TCPA, 1,
>   				(struct acpi_table_header **)&buff);
>
> -	if (ACPI_FAILURE(status)) {
> -		printk(KERN_ERR "%s: ERROR - Could not get TCPA table\n",
> -		       __func__);
> +	if (ACPI_FAILURE(status))
>   		return -EIO;
> -	}
>
>   	switch(buff->platform_class) {
>   	case BIOS_SERVER:
> @@ -78,25 +75,21 @@ int read_log_acpi(struct tpm_chip *chip)
>   		break;
>   	}
>   	if (!len) {
> -		printk(KERN_ERR "%s: ERROR - TCPA log area empty\n", __func__);
> +		dev_dbg(&chip->dev, "%s: ERROR - TCPA log area empty\n",
> +			__func__);
>   		return -EIO;
>   	}
>
>   	/* malloc EventLog space */
>   	log->bios_event_log = kmalloc(len, GFP_KERNEL);
> -	if (!log->bios_event_log) {
> -		printk("%s: ERROR - Not enough  Memory for BIOS measurements\n",
> -			__func__);
> +	if (!log->bios_event_log)
>   		return -ENOMEM;
> -	}
>
>   	log->bios_event_log_end = log->bios_event_log + len;
>
>   	virt = acpi_os_map_iomem(start, len);
> -	if (!virt) {
> -		printk("%s: ERROR - Unable to map memory\n", __func__);
> +	if (!virt)
>   		goto err;
> -	}
>
>   	memcpy_fromio(log->bios_event_log, virt, len);
>
> diff --git a/drivers/char/tpm/tpm_of.c b/drivers/char/tpm/tpm_of.c
> index 22b8f81..1464cae 100644
> --- a/drivers/char/tpm/tpm_of.c
> +++ b/drivers/char/tpm/tpm_of.c
> @@ -31,40 +31,34 @@ int read_log_of(struct tpm_chip *chip)
>   	log = &chip->log;
>   	if (chip->dev.parent->of_node)
>   		np = chip->dev.parent->of_node;
> -	if (!np) {
> -		pr_err("%s: ERROR - IBMVTPM not supported\n", __func__);
> +	if (!np)
>   		return -ENODEV;
> -	}
>
>   	sizep = of_get_property(np, "linux,sml-size", NULL);
>   	if (sizep == NULL) {
> -		pr_err("%s: ERROR - SML size not found\n", __func__);
> -		goto cleanup_eio;
> +		dev_dbg(&chip->dev, "%s: ERROR - SML size not found\n",
> +			__func__);
> +		return -EIO;
>   	}
>   	if (*sizep == 0) {
> -		pr_err("%s: ERROR - event log area empty\n", __func__);
> -		goto cleanup_eio;
> +		dev_dbg(&chip->dev, "%s: ERROR - event log area empty\n",
> +			__func__);
> +		return -EIO;
>   	}
>
>   	basep = of_get_property(np, "linux,sml-base", NULL);
>   	if (basep == NULL) {
> -		pr_err("%s: ERROR - SML not found\n", __func__);
> -		goto cleanup_eio;
> +		dev_dbg(&chip->dev, "%s: ERROR - SML not found\n", __func__);
> +		return -EIO;
>   	}
>
>   	log->bios_event_log = kmalloc(*sizep, GFP_KERNEL);
> -	if (!log->bios_event_log) {
> -		pr_err("%s: ERROR - Not enough memory for BIOS measurements\n",
> -		       __func__);
> +	if (!log->bios_event_log)
>   		return -ENOMEM;
> -	}
>
>   	log->bios_event_log_end = log->bios_event_log + *sizep;
>
>   	memcpy(log->bios_event_log, __va(*basep), *sizep);
>
>   	return 0;
> -
> -cleanup_eio:
> -	return -EIO;
>   }
>


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On Sun, Oct 09, 2016 at 07:25:30AM +0530, Nayna wrote:

> >diff --git a/drivers/char/tpm/tpm_of.c b/drivers/char/tpm/tpm_of.c
> >index 22b8f81..1464cae 100644
> >+++ b/drivers/char/tpm/tpm_of.c
> >@@ -31,40 +31,34 @@ int read_log_of(struct tpm_chip *chip)
> >  	log = &chip->log;
> >  	if (chip->dev.parent->of_node)
> >  		np = chip->dev.parent->of_node;
> >-	if (!np) {
> >-		pr_err("%s: ERROR - IBMVTPM not supported\n", __func__);
> >+	if (!np)
> >  		return -ENODEV;
> >-	}


> >  	sizep = of_get_property(np, "linux,sml-size", NULL);
> >  	if (sizep == NULL) {
> >-		pr_err("%s: ERROR - SML size not found\n", __func__);
> >-		goto cleanup_eio;
> >+		dev_dbg(&chip->dev, "%s: ERROR - SML size not found\n",
> >+			__func__);
> >+		return -EIO;
> >  	}

The properties are optional (eg my DT bound TPMs on ARM do not have
them) so I'm not sure the debug is appropriate either...

Everything else looks OK to me.

Jason

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On 10/10/2016 04:52 AM, Jason Gunthorpe wrote:
> On Sun, Oct 09, 2016 at 07:25:30AM +0530, Nayna wrote:
>
>>> diff --git a/drivers/char/tpm/tpm_of.c b/drivers/char/tpm/tpm_of.c
>>> index 22b8f81..1464cae 100644
>>> +++ b/drivers/char/tpm/tpm_of.c
>>> @@ -31,40 +31,34 @@ int read_log_of(struct tpm_chip *chip)
>>>   	log = &chip->log;
>>>   	if (chip->dev.parent->of_node)
>>>   		np = chip->dev.parent->of_node;
>>> -	if (!np) {
>>> -		pr_err("%s: ERROR - IBMVTPM not supported\n", __func__);
>>> +	if (!np)
>>>   		return -ENODEV;
>>> -	}
>
>
>>>   	sizep = of_get_property(np, "linux,sml-size", NULL);
>>>   	if (sizep == NULL) {
>>> -		pr_err("%s: ERROR - SML size not found\n", __func__);
>>> -		goto cleanup_eio;
>>> +		dev_dbg(&chip->dev, "%s: ERROR - SML size not found\n",
>>> +			__func__);
>>> +		return -EIO;
>>>   	}
>
> The properties are optional (eg my DT bound TPMs on ARM do not have
> them) so I'm not sure the debug is appropriate either...

Hmm.. does that imply that do we even need a msg ?. or probably if 
dev_info(..) looks appropriate, this can give the indication that the 
platform does not support eventlog, and that is ok.

Thanks & Regards,
   - Nayna

>
> Everything else looks OK to me.
>
> Jason
>


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