linux-kernel - [PATCH] lightnvm: pblk: stop taking the free lock in in pblk_lines

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Message-Id: <20190122101531.30893-1-hans@owltronix.com>
Date:   Tue, 22 Jan 2019 11:15:31 +0100
From:   hans@...tronix.com
To:     Matias Bjorling <mb@...htnvm.io>
Cc:     javier@...igon.com, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Hans Holmberg <hans.holmberg@...xlabs.com>
Subject: [PATCH] lightnvm: pblk: stop taking the free lock in in pblk_lines_free

From: Hans Holmberg <hans.holmberg@...xlabs.com>

pblk_line_meta_free might sleep (it can end up calling vfree, depending
on how we allocate lba lists), and this can lead to a BUG()
if we wake up on a different cpu and release the lock.

As there is no point of grabbing the free lock when pblk has shut down,
remove the lock.

Signed-off-by: Hans Holmberg <hans.holmberg@...xlabs.com>
---
 drivers/lightnvm/pblk-init.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/lightnvm/pblk-init.c b/drivers/lightnvm/pblk-init.c
index f9a3e47b6a93..eb0135c77805 100644
--- a/drivers/lightnvm/pblk-init.c
+++ b/drivers/lightnvm/pblk-init.c
@@ -584,14 +584,12 @@ static void pblk_lines_free(struct pblk *pblk)
 	struct pblk_line *line;
 	int i;
 
-	spin_lock(&l_mg->free_lock);
 	for (i = 0; i < l_mg->nr_lines; i++) {
 		line = &pblk->lines[i];
 
 		pblk_line_free(line);
 		pblk_line_meta_free(l_mg, line);
 	}
-	spin_unlock(&l_mg->free_lock);
 
 	pblk_line_mg_free(pblk);
 
-- 
2.17.1