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Subject[PATCH] pstore/ram: fix for adding dumps to non-empty zone
Date
From: Aleksandr Yashkin <a.yashkin@inango-systems.com>

The circle buffer in ramoops zones has a problem for adding a new
oops dump to already an existing one.

The solution to this problem is to reset the circle buffer state before
writing a new oops dump.

Signed-off-by: Aleksandr Yashkin <a.yashkin@inango-systems.com>
Signed-off-by: Nikolay Merinov <n.merinov@inango-systems.com>
Signed-off-by: Ariel Gilman <a.gilman@inango-systems.com>

diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index 8caff834f002..33fceadbf515 100644
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -407,6 +407,13 @@ static int notrace ramoops_pstore_write(struct pstore_record *record)

prz = cxt->dprzs[cxt->dump_write_cnt];

+ /* Clean the buffer from old info.
+ * `ramoops_read_kmsg_hdr' expects to find a header in the beginning of
+ * buffer data, so we must to reset the buffer values, in order to
+ * ensure that the header will be written to the beginning of the buffer
+ */
+ persistent_ram_zap(prz);
+
/* Build header and append record contents. */
hlen = ramoops_write_kmsg_hdr(prz, record);
if (!hlen)
--
2.17.1
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