linux-kernel - [PATCH 5.16 097/186] iavf: Fix deadlock in iavf_reset

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Date:   Mon,  7 Mar 2022 10:18:55 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Slawomir Laba <slawomirx.laba@...el.com>,
        Phani Burra <phani.r.burra@...el.com>,
        Jacob Keller <jacob.e.keller@...el.com>,
        Mateusz Palczewski <mateusz.palczewski@...el.com>,
        Konrad Jankowski <konrad0.jankowski@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>
Subject: [PATCH 5.16 097/186] iavf: Fix deadlock in iavf_reset_task

From: Slawomir Laba <slawomirx.laba@...el.com>

commit e85ff9c631e1bf109ce8428848dfc8e8b0041f48 upstream.

There exists a missing mutex_unlock call on crit_lock in
iavf_reset_task call path.

Unlock the crit_lock before returning from reset task.

Fixes: 5ac49f3c2702 ("iavf: use mutexes for locking of critical sections")
Signed-off-by: Slawomir Laba <slawomirx.laba@...el.com>
Signed-off-by: Phani Burra <phani.r.burra@...el.com>
Signed-off-by: Jacob Keller <jacob.e.keller@...el.com>
Signed-off-by: Mateusz Palczewski <mateusz.palczewski@...el.com>
Tested-by: Konrad Jankowski <konrad0.jankowski@...el.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/intel/iavf/iavf_main.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/net/ethernet/intel/iavf/iavf_main.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_main.c
@@ -2254,6 +2254,7 @@ static void iavf_reset_task(struct work_
 			reg_val);
 		iavf_disable_vf(adapter);
 		mutex_unlock(&adapter->client_lock);
+		mutex_unlock(&adapter->crit_lock);
 		return; /* Do not attempt to reinit. It's dead, Jim. */
 	}