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USB: io_edgeport race condition in counters

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io_edgeport is using a global variable without locking.
This is _the_ classical race condition. This patch switches to atomic_t.

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Oliver Neukum 2007-03-15 15:27:17 +01:00 committed by Greg Kroah-Hartman
parent e198a31489
commit 96c706ed1c
1 changed files with 7 additions and 6 deletions
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13
drivers/usb/serial/io_edgeport.c
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@ -212,7 +212,7 @@ static int debug;
static int low_latency = 1; /* tty low latency flag, on by default */
static int CmdUrbs = 0; /* Number of outstanding Command Write Urbs */
static atomic_t CmdUrbs; /* Number of outstanding Command Write Urbs */
/* local function prototypes */
@ -779,8 +779,8 @@ static void edge_bulk_out_cmd_callback (struct urb *urb)
dbg("%s", __FUNCTION__);
CmdUrbs--;
dbg("%s - FREE URB %p (outstanding %d)", __FUNCTION__, urb, CmdUrbs);
atomic_dec(&CmdUrbs);
dbg("%s - FREE URB %p (outstanding %d)", __FUNCTION__, urb, atomic_read(&CmdUrbs));
/* clean up the transfer buffer */
@ -2317,8 +2317,8 @@ static int write_cmd_usb (struct edgeport_port *edge_port, unsigned char *buffer
if (!urb)
return -ENOMEM;
CmdUrbs++;
dbg("%s - ALLOCATE URB %p (outstanding %d)", __FUNCTION__, urb, CmdUrbs);
atomic_inc(&CmdUrbs);
dbg("%s - ALLOCATE URB %p (outstanding %d)", __FUNCTION__, urb, atomic_read(&CmdUrbs));
usb_fill_bulk_urb (urb, edge_serial->serial->dev,
usb_sndbulkpipe(edge_serial->serial->dev, edge_serial->bulk_out_endpoint),
@ -2332,7 +2332,7 @@ static int write_cmd_usb (struct edgeport_port *edge_port, unsigned char *buffer
dev_err(&edge_port->port->dev, "%s - usb_submit_urb(write command) failed, status = %d\n", __FUNCTION__, status);
usb_kill_urb(urb);
usb_free_urb(urb);
CmdUrbs--;
atomic_dec(&CmdUrbs);
return status;
}
@ -3083,6 +3083,7 @@ static int __init edgeport_init(void)
retval = usb_register(&io_driver);
if (retval)
goto failed_usb_register;
atomic_set(&CmdUrbs, 0);
info(DRIVER_DESC " " DRIVER_VERSION);
return 0;