linux-kernel - [PATCH] ionic: Initialize the 'lif->dbid

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Date:   Sun, 26 Dec 2021 15:06:17 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     snelson@...sando.io, drivers@...sando.io, davem@...emloft.net,
        kuba@...nel.org, allenbh@...sando.io
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH] ionic: Initialize the 'lif->dbid_inuse' bitmap

When allocated, this bitmap is not initialized. Only the first bit is set a
few lines below.

Use bitmap_zalloc() to make sure that it is cleared before being used.

Fixes: 6461b446f2a0 ("ionic: Add interrupts and doorbells")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
The 'dbid_inuse' bitmap seems to be unused.
So it is certainly better to remove it completely instead of "fixing" it.

Let me know if it is the way to go or if it is there for future use.

If it should be left in place, the corresponding kfree() should also be
replaces by some bitmap_free() to keep consistency.
---
 drivers/net/ethernet/pensando/ionic/ionic_lif.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.c b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
index 63f8a8163b5f..2ff7be17e5af 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
@@ -3135,7 +3135,7 @@ int ionic_lif_init(struct ionic_lif *lif)
 		return -EINVAL;
 	}
 
-	lif->dbid_inuse = bitmap_alloc(lif->dbid_count, GFP_KERNEL);
+	lif->dbid_inuse = bitmap_zalloc(lif->dbid_count, GFP_KERNEL);
 	if (!lif->dbid_inuse) {
 		dev_err(dev, "Failed alloc doorbell id bitmap, aborting\n");
 		return -ENOMEM;
-- 
2.32.0