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Fri, 17 Jul 2026 22:30:12 -0700 (PDT) From: Rosen Penev To: dmaengine@vger.kernel.org Cc: Vinod Koul , Frank Li , Harninder Rai , Xuelin Shi , linux-kernel@vger.kernel.org (open list) Subject: [PATCH] dmaengine: fsl_raid: don't invoke client callback under desc_lock Date: Fri, 17 Jul 2026 22:30:10 -0700 Message-ID: <20260718053010.3074329-1-rosenp@gmail.com> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" fsl_re_dequeue() holds re_chan->desc_lock while calling fsl_re_desc_done(), which synchronously invokes the DMA client completion callback via dmaengine_desc_get_callback_invoke(). If that callback submits new work (e.g. fsl_re_tx_submit()), it tries to reacquire the same desc_lock and deadlocks on the spinlock. Collect completed descriptors into a local list under the lock, then release the lock and invoke the callbacks before moving the descriptors to the ack queue. Fixes: ad80da658bbc ("dmaengine: Driver support for FSL RaidEngine device.") Assisted-by: opencode:hy3-free Signed-off-by: Rosen Penev Reviewed-by: Frank Li --- drivers/dma/fsl_raid.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) diff --git a/drivers/dma/fsl_raid.c b/drivers/dma/fsl_raid.c index 2d86f61105e5..bfaef6245695 100644 --- a/drivers/dma/fsl_raid.c +++ b/drivers/dma/fsl_raid.c @@ -162,6 +162,7 @@ static void fsl_re_dequeue(struct tasklet_struct *t) struct fsl_re_hw_desc *hwdesc; unsigned long flags; unsigned int count, oub_count; + LIST_HEAD(completed); int found; =20 fsl_re_cleanup_descs(re_chan); @@ -182,8 +183,7 @@ static void fsl_re_dequeue(struct tasklet_struct *t) } =20 if (found) { - fsl_re_desc_done(desc); - list_move_tail(&desc->node, &re_chan->ack_q); + list_move_tail(&desc->node, &completed); } else { dev_err(re_chan->dev, "found hwdesc not in sw queue, discard it\n"); @@ -196,6 +196,17 @@ static void fsl_re_dequeue(struct tasklet_struct *t) FSL_RE_RMVD_JOB(1)); } spin_unlock_irqrestore(&re_chan->desc_lock, flags); + + /* Invoke the client callbacks outside the channel lock. The callback + * may submit new work which re-acquires desc_lock, so holding it here + * would deadlock. + */ + list_for_each_entry_safe(desc, _desc, &completed, node) { + fsl_re_desc_done(desc); + spin_lock_irqsave(&re_chan->desc_lock, flags); + list_move_tail(&desc->node, &re_chan->ack_q); + spin_unlock_irqrestore(&re_chan->desc_lock, flags); + } } =20 /* Per Job Ring interrupt handler */ --=20 2.55.0