diff options
| author |   Zev Weiss <zev@bewilderbeest.net> | 2021-05-09 20:42:31 -0500 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-05-13 16:16:30 +0200 |
| commit | 54da3e381c2b55289b220601f403f17df7b20597 (patch) | |
| tree | 73f914ea70ff81421c8e9e36e8010142843fb783 /drivers/tty | |
| parent | serial: 8250_aspeed_vuart: initialize vuart->port in aspeed_vuart_probe() (diff) | |
| download | linux-dev-54da3e381c2b55289b220601f403f17df7b20597.tar.xz linux-dev-54da3e381c2b55289b220601f403f17df7b20597.zip | |
serial: 8250_aspeed_vuart: use UPF_IOREMAP to set up register mapping
Previously this driver's use of devm_ioremap_resource() led to
duplicated calls to __release_region() when unbinding it (one from
serial8250_release_std_resource() and one from devres_release_all()),
the second of which resulted in a warning message:
# echo 1e787000.serial > /sys/bus/platform/drivers/aspeed-vuart/unbind
[33091.774200] Trying to free nonexistent resource <000000001e787000-000000001e78703f>
With this change the driver uses the generic serial8250 code's
UPF_IOREMAP to take care of the register mapping automatically instead
of doing its own devm_ioremap_resource(), thus avoiding the duplicate
__release_region() on unbind.
In doing this we eliminate vuart->regs, since it merely duplicates
vuart->port->port.membase, which we now use for our I/O accesses.
Reported-by: Andrew Jeffery <andrew@aj.id.au>
Signed-off-by: Zev Weiss <zev@bewilderbeest.net>
Link: https://lore.kernel.org/r/20210510014231.647-4-zev@bewilderbeest.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/8250/8250_aspeed_vuart.c | 11 |
1 files changed, 3 insertions, 8 deletions
diff --git a/drivers/tty/serial/8250/8250_aspeed_vuart.c b/drivers/tty/serial/8250/8250_aspeed_vuart.c index 249164dc397b..2bf1d8582d9a 100644 --- a/drivers/tty/serial/8250/8250_aspeed_vuart.c +++ b/drivers/tty/serial/8250/8250_aspeed_vuart.c @@ -34,7 +34,6 @@ struct aspeed_vuart { struct device *dev; - void __iomem *regs; struct clk *clk; int line; struct timer_list unthrottle_timer; @@ -66,12 +65,12 @@ static const int unthrottle_timeout = HZ/10; static inline u8 aspeed_vuart_readb(struct aspeed_vuart *vuart, u8 reg) { - return readb(vuart->regs + reg); + return readb(vuart->port->port.membase + reg); } static inline void aspeed_vuart_writeb(struct aspeed_vuart *vuart, u8 val, u8 reg) { - writeb(val, vuart->regs + reg); + writeb(val, vuart->port->port.membase + reg); } static ssize_t lpc_address_show(struct device *dev, @@ -429,13 +428,9 @@ static int aspeed_vuart_probe(struct platform_device *pdev) timer_setup(&vuart->unthrottle_timer, aspeed_vuart_unthrottle_exp, 0); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - vuart->regs = devm_ioremap_resource(&pdev->dev, res); - if (IS_ERR(vuart->regs)) - return PTR_ERR(vuart->regs); memset(&port, 0, sizeof(port)); port.port.private_data = vuart; - port.port.membase = vuart->regs; port.port.mapbase = res->start; port.port.mapsize = resource_size(res); port.port.startup = aspeed_vuart_startup; @@ -492,7 +487,7 @@ static int aspeed_vuart_probe(struct platform_device *pdev) port.port.iotype = UPIO_MEM; port.port.type = PORT_16550A; port.port.uartclk = clk; - port.port.flags = UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF + port.port.flags = UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF | UPF_IOREMAP | UPF_FIXED_PORT | UPF_FIXED_TYPE | UPF_NO_THRE_TEST; if (of_property_read_bool(np, "no-loopback-test")) |