[edk2-devel] [PATCH v1 1/1] RamDiskDxe: Initialize list head before registering RAM disk protocol
Wu, Hao A
hao.a.wu at intel.com
Tue Jul 13 03:44:01 UTC 2021
> -----Original Message-----
> From: devel at edk2.groups.io <devel at edk2.groups.io> On Behalf Of Daniel
> Schaefer
> Sent: Tuesday, July 13, 2021 9:10 AM
> To: devel at edk2.groups.io
> Cc: Trammell Hudson <hudson at trmm.net>; Daniel Schaefer
> <daniel.schaefer at hpe.com>; Wang, Jian J <jian.j.wang at intel.com>; Wu,
> Hao A <hao.a.wu at intel.com>; Ni, Ray <ray.ni at intel.com>; Gao, Zhichao
> <zhichao.gao at intel.com>
> Subject: [edk2-devel] [PATCH v1 1/1] RamDiskDxe: Initialize list head before
> registering RAM disk protocol
>
> From: Trammell Hudson <hudson at trmm.net>
>
> This patch initializes the linked list RegisteredRamDisks in
> RamDiskDxeEntryPoint before the registration of gEfiRamDiskProtocolGuid
> with InstallMultipleProtocolInterfaces, allowing ramdisks to be created via a
> callback installed with RegisterProtocolNotify as soon as the protocol is
> registered.
>
> Without this, calling RamDisk->Register() in the callback causes a crash:
>
> ASSERT [RamDiskDxe] MdePkg/Library/BaseLib/LinkedList.c(75): List-
> >ForwardLink != ((void *) 0)
>
> Signed-off-by: Trammell Hudson <hudson at trmm.net>
> Cc: Daniel Schaefer <daniel.schaefer at hpe.com>
> Cc: Jian J Wang <jian.j.wang at intel.com>
> Cc: Hao A Wu <hao.a.wu at intel.com>
> Cc: Ray Ni <ray.ni at intel.com>
> Cc: Zhichao Gao <zhichao.gao at intel.com>
Thanks a lot for the fix.
Reviewed-by: Hao A Wu <hao.a.wu at intel.com>
I will modify the subject a little bit when merging:
MdeModulePkg/RamDiskDxe: Init list head before registering RamDisk protocol
Best Regards,
Hao Wu
>
> ---
> MdeModulePkg/Universal/Disk/RamDiskDxe/RamDiskDriver.c | 11 ++++++-
> ----
> 1 file changed, 6 insertions(+), 5 deletions(-)
>
> diff --git a/MdeModulePkg/Universal/Disk/RamDiskDxe/RamDiskDriver.c
> b/MdeModulePkg/Universal/Disk/RamDiskDxe/RamDiskDriver.c
> index fcbf4f117dc6..13e2aed87cef 100644
> --- a/MdeModulePkg/Universal/Disk/RamDiskDxe/RamDiskDriver.c
> +++ b/MdeModulePkg/Universal/Disk/RamDiskDxe/RamDiskDriver.c
> @@ -154,6 +154,12 @@ RamDiskDxeEntryPoint (
> goto ErrorExit;
> }
>
> + //
> + // Initialize the list of registered RAM disks maintained by the
> + driver // before installing the protocol // InitializeListHead
> + (&RegisteredRamDisks);
> +
> //
> // Install the EFI_RAM_DISK_PROTOCOL and RAM disk private data onto a
> // new handle
> @@ -170,11 +176,6 @@ RamDiskDxeEntryPoint (
> goto ErrorExit;
> }
>
> - //
> - // Initialize the list of registered RAM disks maintained by the driver
> - //
> - InitializeListHead (&RegisteredRamDisks);
> -
> Status = EfiCreateEventReadyToBootEx (
> TPL_CALLBACK,
> RamDiskAcpiCheck,
> --
> 2.31.1
>
>
>
>
>
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