Re: [U-Boot] [PATCH] efi_loader: Disable env_save() call on boot

[Heinrich Schuchardt]

On 10/19/2017 11:23 PM, Alexander Graf wrote:
> With the introduction of EFI variable support, we also wanted to persist
> these EFI variables. However, the way it was implemented we ended up
> persisting all U-Boot environment variables on every EFI boot.
> 
> That could potentially lead to unexpected side effects because variables
> that were not supposed to be written to persisted env get written. It also
> means we may end up writing the environment more often than we should.
> 
> For this release, let's just disable EFI variable persistence and instead
> implement it properly for the next one.
> 
> Reported-by: Heinrich Schuchardt 
> Fixes: ad644e7c182 ("efi_loader: efi variable support")
> Signed-off-by: Alexander Graf 
> ---
>  lib/efi_loader/efi_boottime.c | 5 +
>  1 file changed, 1 insertion(+), 4 deletions(-)
> 
> diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c
> index f627340de4..743b84864f 100644
> --- a/lib/efi_loader/efi_boottime.c
> +++ b/lib/efi_loader/efi_boottime.c
> @@ -1439,10 +1439,7 @@ static efi_status_t EFIAPI efi_exit_boot_services(void 
> *image_handle,
>   /* Make sure that notification functions are not called anymore */
>   efi_tpl = TPL_HIGH_LEVEL;
>  
> -#if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
> - /* save any EFI variables that have been written: */
> - env_save();
> -#endif
> + /* XXX Should persist EFI variables here */
>  
>   board_quiesce_devices();
>  
> 
Reviewed-by: Heinrich Schuchardt 
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Re: [U-Boot] [PATCH] efi_loader: Disable env_save() call on boot

[Rob Clark]

On Thu, Oct 19, 2017 at 5:23 PM, Alexander Graf  wrote:
> With the introduction of EFI variable support, we also wanted to persist
> these EFI variables. However, the way it was implemented we ended up
> persisting all U-Boot environment variables on every EFI boot.
>
> That could potentially lead to unexpected side effects because variables
> that were not supposed to be written to persisted env get written. It also
> means we may end up writing the environment more often than we should.
>
> For this release, let's just disable EFI variable persistence and instead
> implement it properly for the next one.
>

Acked-by: Rob Clark 

> Reported-by: Heinrich Schuchardt 
> Fixes: ad644e7c182 ("efi_loader: efi variable support")
> Signed-off-by: Alexander Graf 
> ---
>  lib/efi_loader/efi_boottime.c | 5 +
>  1 file changed, 1 insertion(+), 4 deletions(-)
>
> diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c
> index f627340de4..743b84864f 100644
> --- a/lib/efi_loader/efi_boottime.c
> +++ b/lib/efi_loader/efi_boottime.c
> @@ -1439,10 +1439,7 @@ static efi_status_t EFIAPI efi_exit_boot_services(void 
> *image_handle,
> /* Make sure that notification functions are not called anymore */
> efi_tpl = TPL_HIGH_LEVEL;
>
> -#if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
> -   /* save any EFI variables that have been written: */
> -   env_save();
> -#endif
> +   /* XXX Should persist EFI variables here */
>
> board_quiesce_devices();
>
> --
> 2.12.3
>
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[U-Boot] [PATCH] efi_loader: Disable env_save() call on boot

[Alexander Graf]

With the introduction of EFI variable support, we also wanted to persist
these EFI variables. However, the way it was implemented we ended up
persisting all U-Boot environment variables on every EFI boot.

That could potentially lead to unexpected side effects because variables
that were not supposed to be written to persisted env get written. It also
means we may end up writing the environment more often than we should.

For this release, let's just disable EFI variable persistence and instead
implement it properly for the next one.

Reported-by: Heinrich Schuchardt 
Fixes: ad644e7c182 ("efi_loader: efi variable support")
Signed-off-by: Alexander Graf 
---
 lib/efi_loader/efi_boottime.c | 5 +
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c
index f627340de4..743b84864f 100644
--- a/lib/efi_loader/efi_boottime.c
+++ b/lib/efi_loader/efi_boottime.c
@@ -1439,10 +1439,7 @@ static efi_status_t EFIAPI efi_exit_boot_services(void 
*image_handle,
/* Make sure that notification functions are not called anymore */
efi_tpl = TPL_HIGH_LEVEL;
 
-#if defined(CONFIG_CMD_SAVEENV) && !defined(CONFIG_ENV_IS_NOWHERE)
-   /* save any EFI variables that have been written: */
-   env_save();
-#endif
+   /* XXX Should persist EFI variables here */
 
board_quiesce_devices();
 
-- 
2.12.3

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