[RFC][PATCH 0/2]efi_pstore: Avoid missing panic message in NVRAM
From: Seiji Aguchi
Date: Tue Jul 03 2012 - 19:34:38 EST
Current efi_pstore simply overwrites existing entries in NVRAM.
So, if 2nd panic happens before a user checks 1st panic message, 1st panic message will be lost.
To avoid missing 1st panic message, this patch introduce a rule checking if existing entries in NRAM are erasable to efi_pstore.
[PATCH 1/2] Duplicate a shared code between write and erase callbacks
Currently, efi_pstore driver shares a code erasing existing entries in NVRAM with write and erase callbacks.
But there some cases we should avoid erasing existing entries in write callback. (Please see PATCH 2/2).
This patch duplicates the code so that write and erase callbacks work independently.
[PATCH 2/2] write callback: Check if existing entry is erasable
this patch introduce a rule checking if existing entries in NRAM are erasable to efi_pstore.
With this patch, if previous event is panic, efi_pstore never overwrite it.
drivers/firmware/efivars.c | 94 +++++++++++++++++++++++++++++++++++++++++++-
fs/pstore/platform.c | 4 +-
include/linux/pstore.h | 5 ++
3 files changed, 99 insertions(+), 4 deletions(-)
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