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pstore/ram: Should update old dmesg buffer before reading

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Without the update, we'll only see the new dmesg buffer after the
reboot, but previously we could see it right away. Making an oops
visible in pstore filesystem before reboot is a somewhat dubious
feature, but removing it wasn't an intentional change, so let's
restore it.

For this we have to make persistent_ram_save_old() safe for calling
multiple times, and also extern it.

Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Anton Vorontsov
2012-05-26 06:07:49 -07:00
committed by Greg Kroah-Hartman
parent 33735a94af
commit 201e4aca5a
3 changed files with 11 additions and 7 deletions
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fs/pstore/ram.c
+2
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@@ -106,6 +106,8 @@ static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
time->tv_sec = 0;
time->tv_nsec = 0;
/* Update old/shadowed buffer. */
persistent_ram_save_old(prz);
size = persistent_ram_old_size(prz);
*buf = kmalloc(size, GFP_KERNEL);
if (*buf == NULL)