From: Guo Heyi <heyi.guo@linaro.org>
To: Heyi Guo <heyi.guo@linaro.org>
Cc: edk2-devel@lists.01.org, Star Zeng <star.zeng@intel.com>,
Eric Dong <eric.dong@intel.com>, Ruiyu Ni <ruiyu.ni@intel.com>,
Laszlo Ersek <lersek@redhat.com>
Subject: Re: [PATCH 1/1] MdeModulePkg/UefiBootManagerLib: limit recursive call depth
Date: Thu, 1 Mar 2018 10:43:19 +0800 [thread overview]
Message-ID: <20180301024319.GA39361@SZX1000114654> (raw)
In-Reply-To: <1519871972-39281-1-git-send-email-heyi.guo@linaro.org>
Sorry, forgot to add a "v2" mark in the subjuect prefix...
Regards,
Heyi
On Thu, Mar 01, 2018 at 10:39:32AM +0800, Heyi Guo wrote:
> Function BmRepairAllControllers may recursively call itself if some
> driver health protocol returns EfiDriverHealthStatusReconnectRequired.
> However, driver health protocol of some buggy third party driver may
> always return such status even after one and another reconnect. The
> endless iteration will cause stack overflow and then system exception,
> and it may be not easy to find that the exception is actually caused
> by stack overflow.
>
> So we limit the number of reconnect retry to 10 to improve code
> robustness, and DEBUG_CODE is moved ahead before recursive repair to
> track the repair result.
>
> We also remove a duplicated declaration of BmRepairAllControllers() in
> InternalBm.h in this patch, for it is only a trivial change.
>
> Contributed-under: TianoCore Contribution Agreement 1.1
> Signed-off-by: Heyi Guo <heyi.guo@linaro.org>
> Cc: Star Zeng <star.zeng@intel.com>
> Cc: Eric Dong <eric.dong@intel.com>
> Cc: Ruiyu Ni <ruiyu.ni@intel.com>
> Cc: Laszlo Ersek <lersek@redhat.com>
> ---
>
> Notes:
> v2
> - Use argument instead of global variable to record the recursive
> count [Ray]
> - Move DEBUG_CODE before recursively calling BmRepairAllControllers()
> to track the change of each reconnect [Ray]
> - Remove a duplicated declaration of BmRepairAllControllers() in
> InternalBm.h.
>
> MdeModulePkg/Library/UefiBootManagerLib/InternalBm.h | 19 ++++++++++---------
> MdeModulePkg/Library/UefiBootManagerLib/BmBoot.c | 2 +-
> MdeModulePkg/Library/UefiBootManagerLib/BmDriverHealth.c | 18 +++++++++++++-----
> 3 files changed, 24 insertions(+), 15 deletions(-)
>
> diff --git a/MdeModulePkg/Library/UefiBootManagerLib/InternalBm.h b/MdeModulePkg/Library/UefiBootManagerLib/InternalBm.h
> index 25a1d522fe84..21ecd8584d24 100644
> --- a/MdeModulePkg/Library/UefiBootManagerLib/InternalBm.h
> +++ b/MdeModulePkg/Library/UefiBootManagerLib/InternalBm.h
> @@ -108,6 +108,12 @@ CHAR16 *
> #define BM_OPTION_NAME_LEN sizeof ("PlatformRecovery####")
> extern CHAR16 *mBmLoadOptionName[];
>
> +//
> +// Maximum number of reconnect retry to repair controller; it is to limit the
> +// number of recursive call of BmRepairAllControllers.
> +//
> +#define MAX_RECONNECT_REPAIR 10
> +
> /**
> Visitor function to be called by BmForEachVariable for each variable
> in variable storage.
> @@ -145,10 +151,13 @@ typedef struct {
>
> /**
> Repair all the controllers according to the Driver Health status queried.
> +
> + @param ReconnectRepairCount To record the number of recursive call of
> + this function itself.
> **/
> VOID
> BmRepairAllControllers (
> - VOID
> + UINTN ReconnectRepairCount
> );
>
> #define BM_HOTKEY_SIGNATURE SIGNATURE_32 ('b', 'm', 'h', 'k')
> @@ -328,14 +337,6 @@ BmDelPartMatchInstance (
> );
>
> /**
> - Repair all the controllers according to the Driver Health status queried.
> -**/
> -VOID
> -BmRepairAllControllers (
> - VOID
> - );
> -
> -/**
> Print the device path info.
>
> @param DevicePath The device path need to print.
> diff --git a/MdeModulePkg/Library/UefiBootManagerLib/BmBoot.c b/MdeModulePkg/Library/UefiBootManagerLib/BmBoot.c
> index ce19ae400660..b842d5824aed 100644
> --- a/MdeModulePkg/Library/UefiBootManagerLib/BmBoot.c
> +++ b/MdeModulePkg/Library/UefiBootManagerLib/BmBoot.c
> @@ -1767,7 +1767,7 @@ EfiBootManagerBoot (
> //
> // 4. Repair system through DriverHealth protocol
> //
> - BmRepairAllControllers ();
> + BmRepairAllControllers (0);
> }
>
> PERF_START_EX (gImageHandle, "BdsAttempt", NULL, 0, (UINT32) OptionNumber);
> diff --git a/MdeModulePkg/Library/UefiBootManagerLib/BmDriverHealth.c b/MdeModulePkg/Library/UefiBootManagerLib/BmDriverHealth.c
> index ddcee8b0676f..db2f859ae73d 100644
> --- a/MdeModulePkg/Library/UefiBootManagerLib/BmDriverHealth.c
> +++ b/MdeModulePkg/Library/UefiBootManagerLib/BmDriverHealth.c
> @@ -423,10 +423,13 @@ EfiBootManagerFreeDriverHealthInfo (
>
> /**
> Repair all the controllers according to the Driver Health status queried.
> +
> + @param ReconnectRepairCount To record the number of recursive call of
> + this function itself.
> **/
> VOID
> BmRepairAllControllers (
> - VOID
> + UINTN ReconnectRepairCount
> )
> {
> EFI_STATUS Status;
> @@ -548,10 +551,6 @@ BmRepairAllControllers (
> EfiBootManagerFreeDriverHealthInfo (DriverHealthInfo, Count);
>
>
> - if (ReconnectRequired) {
> - BmRepairAllControllers ();
> - }
> -
> DEBUG_CODE (
> CHAR16 *ControllerName;
>
> @@ -576,6 +575,15 @@ BmRepairAllControllers (
> EfiBootManagerFreeDriverHealthInfo (DriverHealthInfo, Count);
> );
>
> + if (ReconnectRequired) {
> + if (ReconnectRepairCount < MAX_RECONNECT_REPAIR) {
> + BmRepairAllControllers (ReconnectRepairCount + 1);
> + } else {
> + DEBUG ((DEBUG_ERROR, "[%a:%d] Repair failed after %d retries.\n",
> + __FUNCTION__, __LINE__, ReconnectRepairCount));
> + }
> + }
> +
> if (RebootRequired) {
> DEBUG ((EFI_D_INFO, "[BDS] One of the Driver Health instances requires rebooting.\n"));
> gRT->ResetSystem (EfiResetWarm, EFI_SUCCESS, 0, NULL);
> --
> 2.7.4
>
next prev parent reply other threads:[~2018-03-01 2:37 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-01 2:39 [PATCH 1/1] MdeModulePkg/UefiBootManagerLib: limit recursive call depth Heyi Guo
2018-03-01 2:43 ` Guo Heyi [this message]
2018-03-01 4:46 ` Ni, Ruiyu
2018-03-07 1:54 ` Guo Heyi
2018-03-08 2:53 ` Ni, Ruiyu
-- strict thread matches above, loose matches on Subject: below --
2018-02-26 8:29 Heyi Guo
2018-02-26 8:56 ` Wang, Sunny (HPS SW)
2018-02-26 11:34 ` Guo Heyi
2018-02-27 2:47 ` Wang, Sunny (HPS SW)
2018-02-26 16:23 ` Laszlo Ersek
2018-02-27 0:48 ` Guo Heyi
2018-02-27 5:48 ` Ni, Ruiyu
2018-02-27 10:29 ` Laszlo Ersek
2018-02-27 10:39 ` Guo Heyi
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