From patchwork Tue Jun 18 15:48:43 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laurent Pinchart X-Patchwork-Id: 13702536 X-Patchwork-Delegate: kieran@bingham.xyz Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 91BC2D299; Tue, 18 Jun 2024 15:49:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=213.167.242.64 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718725751; cv=none; b=kQ0GOj35GObVkEzLnkYOWnchYFOduEGgxhdd9sXf6Dc7jmQl4qCoscD61IeQ/Yygwxu9Dm2AEjmnDEeEoT9/Uim1UOFG67X72rC2vnnTx076BHqd02F4hHSMj5QTPFwVny9CiywbGRmWkdsfBoiXaWIJGRaLEdtV8Nh7Xvmfg40= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718725751; c=relaxed/simple; bh=2+WOwOV2LxgF6B18s5ooyqMqkfj8zWWAHrW9+17lv8I=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=sYJk51wpXsswLDiW7kETPD1/ZP6j/wxFazfKGAmk3ZL7ElVMX9ge8IUUCqA99TvTSyZVMw6Us8qeMuE1yD5l0uFuQpOSrTWW7bcAyuz8gopMNdQwQ2GAibLEl3xoqJs50VeRgjArp4Gn1Dp+p4gHIw8q36AacjIB2NQCRWX5qCo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ideasonboard.com; spf=pass smtp.mailfrom=ideasonboard.com; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b=q5ta4Ett; arc=none smtp.client-ip=213.167.242.64 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="q5ta4Ett" Received: from pendragon.ideasonboard.com (81-175-209-231.bb.dnainternet.fi [81.175.209.231]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 1ABD2908; Tue, 18 Jun 2024 17:48:48 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1718725728; bh=2+WOwOV2LxgF6B18s5ooyqMqkfj8zWWAHrW9+17lv8I=; h=From:To:Cc:Subject:Date:From; b=q5ta4EttH/fyngvVTqHdtVNaFEoeb4ic7m8cGThnYeGcF4r3y5fAMIQvf9ahGgSNe ycWYWJSaX2SHxNxwBXsTFeuCBcbVVOo76R4VgbLRnfsGfW2xGUtI9TTuMLLAsjeP5R XOEuevhjyHlgIxzcEiM0nsHMKsV5Z7H3MhWwck3Y= From: Laurent Pinchart To: linux-media@vger.kernel.org Cc: linux-renesas-soc@vger.kernel.org, Dan Carpenter Subject: [PATCH v2] media: renesas: vsp1: Fix _irqsave and _irq mix Date: Tue, 18 Jun 2024 18:48:43 +0300 Message-ID: <20240618154843.15775-1-laurent.pinchart+renesas@ideasonboard.com> X-Mailer: git-send-email 2.44.2 Precedence: bulk X-Mailing-List: linux-renesas-soc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The histogram support mixes _irqsave and _irq, causing the following smatch warning: drivers/media/platform/renesas/vsp1/vsp1_histo.c:153 histo_stop_streaming() warn: mixing irqsave and irq The histo_stop_streaming() calls spin_lock_irqsave() followed by wait_event_lock_irq(). The former hints that interrupts may be disabled by the caller, while the latter reenables interrupts unconditionally. This doesn't cause any real bug, as the function is always called with interrupts enabled, but the pattern is still incorrect. Fix the problem by using spin_lock_irq() instead of spin_lock_irqsave() in histo_stop_streaming(). While at it, switch to spin_lock_irq() and spin_lock() as appropriate elsewhere. Fixes: 99362e32332b ("[media] v4l: vsp1: Add histogram support") Reported-by: Dan Carpenter Closes: https://lore.kernel.org/linux-renesas-soc/164d74ff-312c-468f-be64-afa7182cd2f4@moroto.mountain/ Reviewed-by: Kieran Bingham Signed-off-by: Laurent Pinchart --- Changes since v1: - Fix typo in commit message --- .../media/platform/renesas/vsp1/vsp1_histo.c | 20 ++++++++----------- 1 file changed, 8 insertions(+), 12 deletions(-) base-commit: 91798162245991e26949ef62851719bb2177a9c2 diff --git a/drivers/media/platform/renesas/vsp1/vsp1_histo.c b/drivers/media/platform/renesas/vsp1/vsp1_histo.c index 71155282ca11..cd1c8778662e 100644 --- a/drivers/media/platform/renesas/vsp1/vsp1_histo.c +++ b/drivers/media/platform/renesas/vsp1/vsp1_histo.c @@ -36,9 +36,8 @@ struct vsp1_histogram_buffer * vsp1_histogram_buffer_get(struct vsp1_histogram *histo) { struct vsp1_histogram_buffer *buf = NULL; - unsigned long flags; - spin_lock_irqsave(&histo->irqlock, flags); + spin_lock(&histo->irqlock); if (list_empty(&histo->irqqueue)) goto done; @@ -49,7 +48,7 @@ vsp1_histogram_buffer_get(struct vsp1_histogram *histo) histo->readout = true; done: - spin_unlock_irqrestore(&histo->irqlock, flags); + spin_unlock(&histo->irqlock); return buf; } @@ -58,7 +57,6 @@ void vsp1_histogram_buffer_complete(struct vsp1_histogram *histo, size_t size) { struct vsp1_pipeline *pipe = histo->entity.pipe; - unsigned long flags; /* * The pipeline pointer is guaranteed to be valid as this function is @@ -70,10 +68,10 @@ void vsp1_histogram_buffer_complete(struct vsp1_histogram *histo, vb2_set_plane_payload(&buf->buf.vb2_buf, 0, size); vb2_buffer_done(&buf->buf.vb2_buf, VB2_BUF_STATE_DONE); - spin_lock_irqsave(&histo->irqlock, flags); + spin_lock(&histo->irqlock); histo->readout = false; wake_up(&histo->wait_queue); - spin_unlock_irqrestore(&histo->irqlock, flags); + spin_unlock(&histo->irqlock); } /* ----------------------------------------------------------------------------- @@ -124,11 +122,10 @@ static void histo_buffer_queue(struct vb2_buffer *vb) struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); struct vsp1_histogram *histo = vb2_get_drv_priv(vb->vb2_queue); struct vsp1_histogram_buffer *buf = to_vsp1_histogram_buffer(vbuf); - unsigned long flags; - spin_lock_irqsave(&histo->irqlock, flags); + spin_lock_irq(&histo->irqlock); list_add_tail(&buf->queue, &histo->irqqueue); - spin_unlock_irqrestore(&histo->irqlock, flags); + spin_unlock_irq(&histo->irqlock); } static int histo_start_streaming(struct vb2_queue *vq, unsigned int count) @@ -140,9 +137,8 @@ static void histo_stop_streaming(struct vb2_queue *vq) { struct vsp1_histogram *histo = vb2_get_drv_priv(vq); struct vsp1_histogram_buffer *buffer; - unsigned long flags; - spin_lock_irqsave(&histo->irqlock, flags); + spin_lock_irq(&histo->irqlock); /* Remove all buffers from the IRQ queue. */ list_for_each_entry(buffer, &histo->irqqueue, queue) @@ -152,7 +148,7 @@ static void histo_stop_streaming(struct vb2_queue *vq) /* Wait for the buffer being read out (if any) to complete. */ wait_event_lock_irq(histo->wait_queue, !histo->readout, histo->irqlock); - spin_unlock_irqrestore(&histo->irqlock, flags); + spin_unlock_irq(&histo->irqlock); } static const struct vb2_ops histo_video_queue_qops = {