diff options
| author | Xiongfeng Wang <wangxiongfeng2@huawei.com> | 2022-11-22 14:45:59 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-11-22 19:58:51 +0300 |
| commit | 8be3a7bf773700534a6e8f87f6ed2ed111254be5 (patch) | |
| tree | 24dbe0b31c7ef57f07f1baba0f41b21dc0ae0a0d /drivers/tty | |
| parent | 22cf92bb3908e1bbc22b03371e9e67e7bd455e0f (diff) | |
| download | linux-8be3a7bf773700534a6e8f87f6ed2ed111254be5.tar.xz | |
serial: pch: Fix PCI device refcount leak in pch_request_dma()
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>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/pch_uart.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c index c76719c0f453..3d54a43768cd 100644 --- a/drivers/tty/serial/pch_uart.c +++ b/drivers/tty/serial/pch_uart.c @@ -694,6 +694,7 @@ static void pch_request_dma(struct uart_port *port) if (!chan) { dev_err(priv->port.dev, "%s:dma_request_channel FAILS(Tx)\n", __func__); + pci_dev_put(dma_dev); return; } priv->chan_tx = chan; @@ -710,6 +711,7 @@ static void pch_request_dma(struct uart_port *port) __func__); dma_release_channel(priv->chan_tx); priv->chan_tx = NULL; + pci_dev_put(dma_dev); return; } @@ -717,6 +719,8 @@ static void pch_request_dma(struct uart_port *port) priv->rx_buf_virt = dma_alloc_coherent(port->dev, port->fifosize, &priv->rx_buf_dma, GFP_KERNEL); priv->chan_rx = chan; + + pci_dev_put(dma_dev); } static void pch_dma_rx_complete(void *arg) |