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author | Christophe JAILLET <christophe.jaillet@wanadoo.fr> | 2016-08-24 07:06:58 +0200 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-08-31 15:42:28 +0200 |
commit | 0b1221a36ca53dca5992caf6b37f67c98bb4e431 (patch) | |
tree | c597b95d5105ed5e164504842a2ceac6aecde581 | |
parent | 761ed4a94582ab291aa24dcbea4e01e8936488c8 (diff) | |
download | op-kernel-dev-0b1221a36ca53dca5992caf6b37f67c98bb4e431.zip op-kernel-dev-0b1221a36ca53dca5992caf6b37f67c98bb4e431.tar.gz |
serial: vt8500_serial: Fix a parameter of find_first_zero_bit.
The 2nd parameter of 'find_first_zero_bit' is the number of bits to search.
In this case, we are passing 'sizeof(vt8500_ports_in_use)'.
'vt8500_ports_in_use' is an 'unsigned long'. So the sizeof is likely to
return 4 on a 32 bits kernel.
A few lines below, we check if it is below VT8500_MAX_PORTS, which is 6.
It is likely that the number of bits in a long was expected here.
In order to fix it:
- use DECLARE_BITMAP when declaring the vt8500_ports_in_use
- use VT8500_MAX_PORTS as a maximum value when checking/setting bits in
this bitmap
- modify code now that 'vt8500_ports_in_use' has become a pointer
because of the use of DECLARE_BITMAP
It has been spotted by the following coccinelle script:
@@
expression ret, x;
@@
* ret = \(find_first_bit \| find_first_zero_bit\) (x, sizeof(...));
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r-- | drivers/tty/serial/vt8500_serial.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/tty/serial/vt8500_serial.c b/drivers/tty/serial/vt8500_serial.c index 23cfc5e..6b85adc 100644 --- a/drivers/tty/serial/vt8500_serial.c +++ b/drivers/tty/serial/vt8500_serial.c @@ -118,7 +118,7 @@ struct vt8500_port { * have been allocated as we can't use pdev->id in * devicetree */ -static unsigned long vt8500_ports_in_use; +static DECLARE_BITMAP(vt8500_ports_in_use, VT8500_MAX_PORTS); static inline void vt8500_write(struct uart_port *port, unsigned int val, unsigned int off) @@ -663,15 +663,15 @@ static int vt8500_serial_probe(struct platform_device *pdev) if (port < 0) { /* calculate the port id */ - port = find_first_zero_bit(&vt8500_ports_in_use, - sizeof(vt8500_ports_in_use)); + port = find_first_zero_bit(vt8500_ports_in_use, + VT8500_MAX_PORTS); } if (port >= VT8500_MAX_PORTS) return -ENODEV; /* reserve the port id */ - if (test_and_set_bit(port, &vt8500_ports_in_use)) { + if (test_and_set_bit(port, vt8500_ports_in_use)) { /* port already in use - shouldn't really happen */ return -EBUSY; } |