From: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Date: Wed, 16 Nov 2022 09:32:04 +0000 (+0800)
Subject: spi: dw-dma: decrease reference count in dw_spi_dma_init_mfld()
X-Git-Tag: v5.10.157~120
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fcb2d286362b19c07d5ea85878738e48422067ce;p=thirdparty%2Fkernel%2Fstable.git

spi: dw-dma: decrease reference count in dw_spi_dma_init_mfld()

[ Upstream commit 804313b64e412a81b0b3389a10e7622452004aa6 ]

pci_get_device() will increase the reference count for the returned
pci_dev. Since 'dma_dev' is only used to filter the channel in
dw_spi_dma_chan_filer() after using it we need to call pci_dev_put() to
decrease the reference count. Also add pci_dev_put() for the error case.

Fixes: 7063c0d942a1 ("spi/dw_spi: add DMA support")
Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Acked-by: Serge Semin <fancer.lancer@gmail.com>
Link: https://lore.kernel.org/r/20221116093204.46700-1-wangxiongfeng2@huawei.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/drivers/spi/spi-dw-dma.c b/drivers/spi/spi-dw-dma.c
index a09831c62192a..32ac8f9068e87 100644
--- a/drivers/spi/spi-dw-dma.c
+++ b/drivers/spi/spi-dw-dma.c
@@ -127,12 +127,15 @@ static int dw_spi_dma_init_mfld(struct device *dev, struct dw_spi *dws)
 
 	dw_spi_dma_sg_burst_init(dws);
 
+	pci_dev_put(dma_dev);
+
 	return 0;
 
 free_rxchan:
 	dma_release_channel(dws->rxchan);
 	dws->rxchan = NULL;
 err_exit:
+	pci_dev_put(dma_dev);
 	return -EBUSY;
 }