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pstore: Enable compression on normal path (again) 

The commit f0e2efcfd2 ("pstore: do not use message compression
without lock") added a check to 'is_locked' to avoid breakage in
concurrent accesses.  But it has a side-effect of disabling compression
on normal path since 'is_locked' variable is not set.  As normal path
always takes the lock, it should be initialized to 1.

This also makes the unlock code a bit simpler.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Namhyung Kim 2016-05-18 21:00:05 +09:00 committed by Kees Cook
parent a1db8060f5
commit 98e44fda2e
1 changed files with 5 additions and 6 deletions
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11
fs/pstore/platform.c
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@ -284,7 +284,7 @@ static void pstore_dump(struct kmsg_dumper *dumper,
u64 id;
unsigned int part = 1;
unsigned long flags = 0;
int is_locked = 0;
int is_locked;
int ret;
why = get_reason_str(reason);
@ -295,8 +295,10 @@ static void pstore_dump(struct kmsg_dumper *dumper,
pr_err("pstore dump routine blocked in %s path, may corrupt error record\n"
, in_nmi() ? "NMI" : why);
}
} else
} else {
spin_lock_irqsave(&psinfo->buf_lock, flags);
is_locked = 1;
}
oopscount++;
while (total < kmsg_bytes) {
char *dst;
@ -350,10 +352,7 @@ static void pstore_dump(struct kmsg_dumper *dumper,
total += total_len;
part++;
}
if (pstore_cannot_block_path(reason)) {
if (is_locked)
spin_unlock_irqrestore(&psinfo->buf_lock, flags);
} else
if (is_locked)
spin_unlock_irqrestore(&psinfo->buf_lock, flags);
}