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serial: amba-pl011: fix regression, causing an Oops on rmmod 

A recent commit ef2889f7ff "serial: pl011:
Move uart_register_driver call to device probe" introduced a regression,
causing the pl011 driver to Oops if more than 1 port have been probed. Fix
the Oops by only calling uart_unregister_driver() once after the last port
has been removed.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Guennadi Liakhovetski 2014-04-05 16:31:08 +02:00 committed by Greg Kroah-Hartman
parent 9ca83fd2d5
commit 1e7da05304
1 changed files with 5 additions and 1 deletions
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6
drivers/tty/serial/amba-pl011.c
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@ -2176,6 +2176,7 @@ static int pl011_probe(struct amba_device *dev, const struct amba_id *id)
static int pl011_remove(struct amba_device *dev)
{
struct uart_amba_port *uap = amba_get_drvdata(dev);
bool busy = false;
int i;
uart_remove_one_port(&amba_reg, &uap->port);
@ -2183,9 +2184,12 @@ static int pl011_remove(struct amba_device *dev)
for (i = 0; i < ARRAY_SIZE(amba_ports); i++)
if (amba_ports[i] == uap)
amba_ports[i] = NULL;
else if (amba_ports[i])
busy = true;
pl011_dma_remove(uap);
uart_unregister_driver(&amba_reg);
if (!busy)
uart_unregister_driver(&amba_reg);
return 0;
}