linux-kernel - [PATCH v2] media: budget-core: Improve exception handling in budget

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Date:   Sat,  6 Jun 2020 00:17:28 +0800
From:   Chuhong Yuan <hslester96@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Markus Elfring <Markus.Elfring@....de>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Chuhong Yuan <hslester96@...il.com>
Subject: [PATCH v2] media: budget-core: Improve exception handling in budget_register()

budget_register() has no error handling after its failure.
Add the missed undo functions for error handling to fix it.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Chuhong Yuan <hslester96@...il.com>
---
Changes in v2:
  - Modify the label of error handler.

 drivers/media/pci/ttpci/budget-core.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/media/pci/ttpci/budget-core.c b/drivers/media/pci/ttpci/budget-core.c
index fadbdeeb4495..293867b9e796 100644
--- a/drivers/media/pci/ttpci/budget-core.c
+++ b/drivers/media/pci/ttpci/budget-core.c
@@ -369,20 +369,25 @@ static int budget_register(struct budget *budget)
 	ret = dvbdemux->dmx.add_frontend(&dvbdemux->dmx, &budget->hw_frontend);
 
 	if (ret < 0)
-		return ret;
+		goto err_release_dmx;
 
 	budget->mem_frontend.source = DMX_MEMORY_FE;
 	ret = dvbdemux->dmx.add_frontend(&dvbdemux->dmx, &budget->mem_frontend);
 	if (ret < 0)
-		return ret;
+		goto err_release_dmx;
 
 	ret = dvbdemux->dmx.connect_frontend(&dvbdemux->dmx, &budget->hw_frontend);
 	if (ret < 0)
-		return ret;
+		goto err_release_dmx;
 
 	dvb_net_init(&budget->dvb_adapter, &budget->dvb_net, &dvbdemux->dmx);
 
 	return 0;
+
+err_release_dmx:
+	dvb_dmxdev_release(&budget->dmxdev);
+	dvb_dmx_release(&budget->demux);
+	return ret;
 }
 
 static void budget_unregister(struct budget *budget)
-- 
2.26.2