From: Jia He <justin.he@arm.com>
To: Ariel Elior <aelior@marvell.com>,
GR-everest-linux-l2@marvell.com,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, nd@arm.com,
Jia He <justin.he@arm.com>,
Prabhakar Kushwaha <pkushwaha@marvell.com>
Subject: [PATCH net v2] Revert "qed: fix possible unpaired spin_{un}lock_bh in _qed_mcp_cmd_and_union()"
Date: Tue, 20 Jul 2021 21:26:55 +0800 [thread overview]
Message-ID: <20210720132655.4704-1-justin.he@arm.com> (raw)
This reverts commit 6206b7981a36476f4695d661ae139f7db36a802d.
That patch added additional spin_{un}lock_bh(), which was harmless
but pointless. The orginal code path has guaranteed the pair of
spin_{un}lock_bh().
We'd better revert it before we find the exact root cause of the
bug_on mentioned in that patch.
Fixes: 6206b7981a36 ("qed: fix possible unpaired spin_{un}lock_bh in _qed_mcp_cmd_and_union()")
Cc: David S. Miller <davem@davemloft.net>
Cc: Prabhakar Kushwaha <pkushwaha@marvell.com>
Signed-off-by: Jia He <justin.he@arm.com>
---
v2: correct the hash value of reverted commit, and add the fixes tag
drivers/net/ethernet/qlogic/qed/qed_mcp.c | 23 ++++++-----------------
1 file changed, 6 insertions(+), 17 deletions(-)
diff --git a/drivers/net/ethernet/qlogic/qed/qed_mcp.c b/drivers/net/ethernet/qlogic/qed/qed_mcp.c
index 79d879a5d663..4387292c37e2 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_mcp.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_mcp.c
@@ -474,18 +474,14 @@ _qed_mcp_cmd_and_union(struct qed_hwfn *p_hwfn,
spin_lock_bh(&p_hwfn->mcp_info->cmd_lock);
- if (!qed_mcp_has_pending_cmd(p_hwfn)) {
- spin_unlock_bh(&p_hwfn->mcp_info->cmd_lock);
+ if (!qed_mcp_has_pending_cmd(p_hwfn))
break;
- }
rc = qed_mcp_update_pending_cmd(p_hwfn, p_ptt);
- if (!rc) {
- spin_unlock_bh(&p_hwfn->mcp_info->cmd_lock);
+ if (!rc)
break;
- } else if (rc != -EAGAIN) {
+ else if (rc != -EAGAIN)
goto err;
- }
spin_unlock_bh(&p_hwfn->mcp_info->cmd_lock);
@@ -502,8 +498,6 @@ _qed_mcp_cmd_and_union(struct qed_hwfn *p_hwfn,
return -EAGAIN;
}
- spin_lock_bh(&p_hwfn->mcp_info->cmd_lock);
-
/* Send the mailbox command */
qed_mcp_reread_offsets(p_hwfn, p_ptt);
seq_num = ++p_hwfn->mcp_info->drv_mb_seq;
@@ -530,18 +524,14 @@ _qed_mcp_cmd_and_union(struct qed_hwfn *p_hwfn,
spin_lock_bh(&p_hwfn->mcp_info->cmd_lock);
- if (p_cmd_elem->b_is_completed) {
- spin_unlock_bh(&p_hwfn->mcp_info->cmd_lock);
+ if (p_cmd_elem->b_is_completed)
break;
- }
rc = qed_mcp_update_pending_cmd(p_hwfn, p_ptt);
- if (!rc) {
- spin_unlock_bh(&p_hwfn->mcp_info->cmd_lock);
+ if (!rc)
break;
- } else if (rc != -EAGAIN) {
+ else if (rc != -EAGAIN)
goto err;
- }
spin_unlock_bh(&p_hwfn->mcp_info->cmd_lock);
} while (++cnt < max_retries);
@@ -564,7 +554,6 @@ _qed_mcp_cmd_and_union(struct qed_hwfn *p_hwfn,
return -EAGAIN;
}
- spin_lock_bh(&p_hwfn->mcp_info->cmd_lock);
qed_mcp_cmd_del_elem(p_hwfn, p_cmd_elem);
spin_unlock_bh(&p_hwfn->mcp_info->cmd_lock);
--
2.17.1
next reply other threads:[~2021-07-20 13:34 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-20 13:26 Jia He [this message]
2021-07-20 14:30 ` [PATCH net v2] Revert "qed: fix possible unpaired spin_{un}lock_bh in _qed_mcp_cmd_and_union()" patchwork-bot+netdevbpf
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210720132655.4704-1-justin.he@arm.com \
--to=justin.he@arm.com \
--cc=GR-everest-linux-l2@marvell.com \
--cc=aelior@marvell.com \
--cc=davem@davemloft.net \
--cc=kuba@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=nd@arm.com \
--cc=netdev@vger.kernel.org \
--cc=pkushwaha@marvell.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).