linux-kernel - [PATCH v7 01/13] media: atmel: atmel-isc-base: use streaming status when queueing buffers

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20220307120423.2427631-2-eugen.hristev@microchip.com>
Date:   Mon, 7 Mar 2022 14:04:11 +0200
From:   Eugen Hristev <eugen.hristev@...rochip.com>
To:     <linux-media@...r.kernel.org>, <jacopo@...ndi.org>
CC:     <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <claudiu.beznea@...rochip.com>, <hverkuil-cisco@...all.nl>,
        <nicolas.ferre@...rochip.com>,
        Eugen Hristev <eugen.hristev@...rochip.com>
Subject: [PATCH v7 01/13] media: atmel: atmel-isc-base: use streaming status when queueing buffers

During experiments with libcamera, it looks like vb2_is_streaming returns
true before our start streaming is called.
Order of operations is streamon -> queue -> start_streaming
ISC would have started the DMA immediately when a buffer is being added
to the vbqueue if the queue is streaming.
It is more safe to start the DMA after the start streaming of the driver is
called.
Thus, even if vb2queue is streaming, add the buffer to the dma queue of the
driver instead of actually starting the DMA process, if the start streaming
has not been called yet.
Tho achieve this, we have to use vb2_start_streaming_called instead of
vb2_is_streaming.

Signed-off-by: Eugen Hristev <eugen.hristev@...rochip.com>
Reviewed-by: Jacopo Mondi <jacopo@...ndi.org>
---
 drivers/media/platform/atmel/atmel-isc-base.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/platform/atmel/atmel-isc-base.c b/drivers/media/platform/atmel/atmel-isc-base.c
index db15770d5b88..d2cc6c99984f 100644
--- a/drivers/media/platform/atmel/atmel-isc-base.c
+++ b/drivers/media/platform/atmel/atmel-isc-base.c
@@ -442,7 +442,7 @@ static void isc_buffer_queue(struct vb2_buffer *vb)

 	spin_lock_irqsave(&isc->dma_queue_lock, flags);
 	if (!isc->cur_frm && list_empty(&isc->dma_queue) &&
-		vb2_is_streaming(vb->vb2_queue)) {
+		vb2_start_streaming_called(vb->vb2_queue)) {
 		isc->cur_frm = buf;
 		isc_start_dma(isc);
 	} else
-- 
2.25.1