tree f7212bef7a5c3845974a9a093f2b7dd0c68814cd
parent a4ea20ab82aa2b197dc7b08f51e1d615578276a0
author Xiongfeng Wang <wangxiongfeng2@huawei.com> 1669117559 +0800
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1674030383 +0100

serial: pch: Fix PCI device refcount leak in pch_request_dma()

[ Upstream commit 8be3a7bf773700534a6e8f87f6ed2ed111254be5 ]

As comment of pci_get_slot() says, it returns a pci_device with its
refcount increased. The caller must decrement the reference count by
calling pci_dev_put().

Since 'dma_dev' is only used to filter the channel in filter(), we can
call pci_dev_put() before exiting from pch_request_dma(). Add the
missing pci_dev_put() for the normal and error path.

Fixes: 3c6a483275f4 ("Serial: EG20T: add PCH_UART driver")
Signed-off-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Link: https://lore.kernel.org/r/20221122114559.27692-1-wangxiongfeng2@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>