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Subject[PATCH] pstore/ram: Fix console ramoops to show the previous boot logs
Date
commit b05c950698fe ("pstore/ram: Simplify ramoops_get_next_prz()
arguments") changed update assignment in getting next persistent
ram zone by adding a check for record type. But the check always
returns true since the record type is assigned 0. And this breaks
console ramoops by showing current console log instead of previous
log on warm reset and hard reset (actually hard reset should not
be showing any logs).

Fix this by having persistent ram zone type check instead of record
type check. Tested this on SDM845 MTP and dragonboard 410c.

Reproducing this issue is simple as below:

1. Trigger hard reset and mount pstore. Will see console-ramoops
record in the mounted location which is the current log.

2. Trigger warm reset and mount pstore. Will see the current
console-ramoops record instead of previous record.

Fixes: b05c950698fe ("pstore/ram: Simplify ramoops_get_next_prz() arguments")
Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>

---

I guess commit msg can be improved.
---
fs/pstore/ram.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index 96f7d32cd184..441a44215456 100644
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -128,7 +128,7 @@ ramoops_get_next_prz(struct persistent_ram_zone *przs[], int id,
struct pstore_record *record)
{
struct persistent_ram_zone *prz;
- bool update = (record->type == PSTORE_TYPE_DMESG);
+ bool update;

/* Give up if we never existed or have hit the end. */
if (!przs)
@@ -138,6 +138,8 @@ ramoops_get_next_prz(struct persistent_ram_zone *przs[], int id,
if (!prz)
return NULL;

+ update = (prz->type == PSTORE_TYPE_DMESG);
+
/* Update old/shadowed buffer. */
if (update)
persistent_ram_save_old(prz);
--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation
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