linux-kernel - [PATCH] [media] tw5864-core: remove excessive irqsave

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Message-Id: <20160824231718.25032-1-andrey.utkin@corp.bluecherry.net>
Date:   Thu, 25 Aug 2016 02:17:18 +0300
From:   Andrey Utkin <andrey.utkin@...p.bluecherry.net>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Bluecherry Maintainers <maintainers@...echerrydvr.com>,
        Andrey Utkin <andrey_utkin@...tmail.com>,
        Andrey Utkin <andrey.utkin@...p.bluecherry.net>
Subject: [PATCH] [media] tw5864-core: remove excessive irqsave

As warned by smatch:
	drivers/media/pci/tw5864/tw5864-core.c:160 tw5864_h264_isr() error: double lock 'irqsave:flags'
	drivers/media/pci/tw5864/tw5864-core.c:174 tw5864_h264_isr() error: double unlock 'irqsave:flags'

Two different spinlocks are obtained, so having two calls is correct,
but second irqsave is superfluous, and using same "flags" variable is
just wrong.

Reported-by: Mauro Carvalho Chehab <mchehab@...pensource.com>
Signed-off-by: Andrey Utkin <andrey.utkin@...p.bluecherry.net>
---
 drivers/media/pci/tw5864/tw5864-core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/media/pci/tw5864/tw5864-core.c b/drivers/media/pci/tw5864/tw5864-core.c
index 440cd7b..1d43b96 100644
--- a/drivers/media/pci/tw5864/tw5864-core.c
+++ b/drivers/media/pci/tw5864/tw5864-core.c
@@ -157,12 +157,12 @@ static void tw5864_h264_isr(struct tw5864_dev *dev)
 
 		cur_frame = next_frame;
 
-		spin_lock_irqsave(&input->slock, flags);
+		spin_lock(&input->slock);
 		input->frame_seqno++;
 		input->frame_gop_seqno++;
 		if (input->frame_gop_seqno >= input->gop)
 			input->frame_gop_seqno = 0;
-		spin_unlock_irqrestore(&input->slock, flags);
+		spin_unlock(&input->slock);
 	} else {
 		dev_err(&dev->pci->dev,
 			"Skipped frame on input %d because all buffers busy\n",
-- 
2.9.2