linux-kernel - [PATCH 3.16 51/63] dmaengine: qcom: bam

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Message-ID: <lsq.1578512578.711401705@decadent.org.uk>
Date:   Wed, 08 Jan 2020 19:43:49 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Vinod Koul" <vkoul@...nel.org>,
        "Jeffrey Hugo" <jeffrey.l.hugo@...il.com>
Subject: [PATCH 3.16 51/63] dmaengine: qcom: bam_dma: Fix resource leak

3.16.81-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Jeffrey Hugo <jeffrey.l.hugo@...il.com>

commit 7667819385457b4aeb5fac94f67f52ab52cc10d5 upstream.

bam_dma_terminate_all() will leak resources if any of the transactions are
committed to the hardware (present in the desc fifo), and not complete.
Since bam_dma_terminate_all() does not cause the hardware to be updated,
the hardware will still operate on any previously committed transactions.
This can cause memory corruption if the memory for the transaction has been
reassigned, and will cause a sync issue between the BAM and its client(s).

Fix this by properly updating the hardware in bam_dma_terminate_all().

Fixes: e7c0fe2a5c84 ("dmaengine: add Qualcomm BAM dma driver")
Signed-off-by: Jeffrey Hugo <jeffrey.l.hugo@...il.com>
Link: https://lore.kernel.org/r/20191017152606.34120-1-jeffrey.l.hugo@gmail.com
Signed-off-by: Vinod Koul <vkoul@...nel.org>
[Jeffrey Hugo: Backported to 4.4 which is lacking 6b4faeac05bc
 ("dmaengine: qcom-bam: Process multiple pending descriptors")]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/dma/qcom_bam_dma.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

--- a/drivers/dma/qcom_bam_dma.c
+++ b/drivers/dma/qcom_bam_dma.c
@@ -539,7 +539,21 @@ static void bam_dma_terminate_all(struct
 
 	/* remove all transactions, including active transaction */
 	spin_lock_irqsave(&bchan->vc.lock, flag);
+	/*
+	 * If we have transactions queued, then some might be committed to the
+	 * hardware in the desc fifo.  The only way to reset the desc fifo is
+	 * to do a hardware reset (either by pipe or the entire block).
+	 * bam_chan_init_hw() will trigger a pipe reset, and also reinit the
+	 * pipe.  If the pipe is left disabled (default state after pipe reset)
+	 * and is accessed by a connected hardware engine, a fatal error in
+	 * the BAM will occur.  There is a small window where this could happen
+	 * with bam_chan_init_hw(), but it is assumed that the caller has
+	 * stopped activity on any attached hardware engine.  Make sure to do
+	 * this first so that the BAM hardware doesn't cause memory corruption
+	 * by accessing freed resources.
+	 */
 	if (bchan->curr_txd) {
+		bam_chan_init_hw(bchan, bchan->curr_txd->dir);
 		list_add(&bchan->curr_txd->vd.node, &bchan->vc.desc_issued);
 		bchan->curr_txd = NULL;
 	}