linux-kernel - [PATCH] lightnvm: pblk: remove spinlock when freeing line metadata

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Message-Id: <1507192546-12156-1-git-send-email-hans.ml.holmberg@owltronix.com>
Date:   Thu,  5 Oct 2017 10:35:46 +0200
From:   Hans Holmberg <hans.ml.holmberg@...tronix.com>
To:     Matias Bjorling <mb@...htnvm.io>
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Javier Gonzales <jg@...htnvm.io>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Hans Holmberg <hans.holmberg@...xlabs.com>
Subject: [PATCH] lightnvm: pblk: remove spinlock when freeing line metadata

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

Lockdep complains about being in atomic context while freeing line
metadata - and rightly so as we take a spinlock and end up calling
vfree that might sleep(in pblk_mfree).

There is no need for holding the line manager free_lock while
freeing line metadata, so remove the lock.

Signed-off-by: Hans Holmberg <hans.holmberg@...xlabs.com>
---
This patch is for:
https://github.com/OpenChannelSSD/linux branch for-4.15/pblk

 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 c452478..a645117 100644
--- a/drivers/lightnvm/pblk-init.c
+++ b/drivers/lightnvm/pblk-init.c
@@ -393,13 +393,11 @@ static void pblk_line_meta_free(struct pblk *pblk)
 	kfree(l_mg->bb_aux);
 	kfree(l_mg->vsc_list);
 
-	spin_lock(&l_mg->free_lock);
 	for (i = 0; i < PBLK_DATA_LINES; i++) {
 		kfree(l_mg->sline_meta[i]);
 		pblk_mfree(l_mg->eline_meta[i]->buf, l_mg->emeta_alloc_type);
 		kfree(l_mg->eline_meta[i]);
 	}
-	spin_unlock(&l_mg->free_lock);
 
 	kfree(pblk->lines);
 }
-- 
2.7.4