linux-kernel - Re: [PATCH v3] acpi: apei: fix the wrongly iterate generic error status block

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Date:   Wed, 16 Aug 2017 07:55:37 -0600
From:   "Baicar, Tyler" <tbaicar@...eaurora.org>
To:     Dongjiu Geng <gengdongjiu@...wei.com>, bp@...e.de,
        james.morse@....com, geliangtang@...il.com,
        andriy.shevchenko@...ux.intel.com, tony.luck@...el.com,
        austinwc@...eaurora.org, rjw@...ysocki.net, lenb@...nel.org,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        linuxarm@...wei.com, john.garry@...wei.com, shiju.jose@...wei.com,
        zhengqiang10@...wei.com, wangxiongfeng2@...wei.com
Cc:     huangshaoyu@...wei.com, wuquanming@...wei.com
Subject: Re: [PATCH v3] acpi: apei: fix the wrongly iterate generic error
 status block

On 8/16/2017 2:14 AM, Dongjiu Geng wrote:
> The revision 0x300 generic error data entry is different
> from the old version, but currently iterating through the
> GHES estatus blocks does not take into account this difference.
> This will lead to failure to get the right data entry if GHES
> has revision 0x300 error data entry.
>
> Update the GHES estatus iteration to properly increment using
> acpi_hest_get_next, and correct the iteration termination condition
> because the status block data length only includes error data length.
> Clear the CPER estatus printing iteration logic to use same macro.
>
> Signed-off-by: Dongjiu Geng <gengdongjiu@...wei.com>
> CC: Tyler Baicar <tbaicar@...eaurora.org>
Tested-by: Tyler Baicar <tbaicar@...eaurora.org>

Works good for me!

Thanks,
Tyler
> ---
>   drivers/acpi/apei/apei-internal.h |  5 -----
>   drivers/firmware/efi/cper.c       | 12 ++----------
>   include/acpi/ghes.h               |  5 +++++
>   3 files changed, 7 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/acpi/apei/apei-internal.h b/drivers/acpi/apei/apei-internal.h
> index 6e9f14c0a71b..cb4126051f62 100644
> --- a/drivers/acpi/apei/apei-internal.h
> +++ b/drivers/acpi/apei/apei-internal.h
> @@ -120,11 +120,6 @@ int apei_exec_collect_resources(struct apei_exec_context *ctx,
>   struct dentry;
>   struct dentry *apei_get_debugfs_dir(void);
>   
> -#define apei_estatus_for_each_section(estatus, section)			\
> -	for (section = (struct acpi_hest_generic_data *)(estatus + 1);	\
> -	     (void *)section - (void *)estatus < estatus->data_length;	\
> -	     section = (void *)(section+1) + section->error_data_length)
> -
>   static inline u32 cper_estatus_len(struct acpi_hest_generic_status *estatus)
>   {
>   	if (estatus->raw_data_length)
> diff --git a/drivers/firmware/efi/cper.c b/drivers/firmware/efi/cper.c
> index 48a8f69da42a..bf3672a81e49 100644
> --- a/drivers/firmware/efi/cper.c
> +++ b/drivers/firmware/efi/cper.c
> @@ -606,7 +606,6 @@ void cper_estatus_print(const char *pfx,
>   			const struct acpi_hest_generic_status *estatus)
>   {
>   	struct acpi_hest_generic_data *gdata;
> -	unsigned int data_len;
>   	int sec_no = 0;
>   	char newpfx[64];
>   	__u16 severity;
> @@ -617,14 +616,10 @@ void cper_estatus_print(const char *pfx,
>   		       "It has been corrected by h/w "
>   		       "and requires no further action");
>   	printk("%s""event severity: %s\n", pfx, cper_severity_str(severity));
> -	data_len = estatus->data_length;
> -	gdata = (struct acpi_hest_generic_data *)(estatus + 1);
>   	snprintf(newpfx, sizeof(newpfx), "%s%s", pfx, INDENT_SP);
>   
> -	while (data_len >= acpi_hest_get_size(gdata)) {
> +	apei_estatus_for_each_section(estatus, gdata) {
>   		cper_estatus_print_section(newpfx, gdata, sec_no);
> -		data_len -= acpi_hest_get_record_size(gdata);
> -		gdata = acpi_hest_get_next(gdata);
>   		sec_no++;
>   	}
>   }
> @@ -653,15 +648,12 @@ int cper_estatus_check(const struct acpi_hest_generic_status *estatus)
>   	if (rc)
>   		return rc;
>   	data_len = estatus->data_length;
> -	gdata = (struct acpi_hest_generic_data *)(estatus + 1);
>   
> -	while (data_len >= acpi_hest_get_size(gdata)) {
> +	apei_estatus_for_each_section(estatus, gdata) {
>   		gedata_len = acpi_hest_get_error_length(gdata);
>   		if (gedata_len > data_len - acpi_hest_get_size(gdata))
>   			return -EINVAL;
> -
>   		data_len -= acpi_hest_get_record_size(gdata);
> -		gdata = acpi_hest_get_next(gdata);
>   	}
>   	if (data_len)
>   		return -EINVAL;
> diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
> index 9f26e01186ae..9061c5c743b3 100644
> --- a/include/acpi/ghes.h
> +++ b/include/acpi/ghes.h
> @@ -113,6 +113,11 @@ static inline void *acpi_hest_get_next(struct acpi_hest_generic_data *gdata)
>   	return (void *)(gdata) + acpi_hest_get_record_size(gdata);
>   }
>   
> +#define apei_estatus_for_each_section(estatus, section)			\
> +	for (section = (struct acpi_hest_generic_data *)(estatus + 1);	\
> +	     (void *)section - (void *)(estatus + 1) < estatus->data_length; \
> +	     section = acpi_hest_get_next(section))
> +
>   int ghes_notify_sea(void);
>   
>   #endif /* GHES_H */

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