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authorAlan Cox <alan@linux.intel.com>2009-11-18 14:12:58 +0000
committerGreg Kroah-Hartman <gregkh@suse.de>2009-11-30 16:38:25 -0800
commit8627b96dd80dca440d91fbb1ec733be25912d0dd (patch)
treeb0b534e46c6d8ba93a8183de4abfc1cdd0323a38
parenta8a84540eb3fd0493f250dc1c513bef6810a50fd (diff)
tty_port: handle the nonblocking open of a dead port corner case
Some drivers allow O_NDELAY of a dead port (eg for setserial to work). In that situation we must not try to raise the carrier. Signed-off-by: Alan Cox <alan@linux.intel.com> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--drivers/char/tty_port.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/char/tty_port.c b/drivers/char/tty_port.c
index 2e8552dc5ed..c63f3d33914 100644
--- a/drivers/char/tty_port.c
+++ b/drivers/char/tty_port.c
@@ -219,8 +219,11 @@ int tty_port_block_til_ready(struct tty_port *port,
/* if non-blocking mode is set we can pass directly to open unless
the port has just hung up or is in another error state */
- if ((filp->f_flags & O_NONBLOCK) ||
- (tty->flags & (1 << TTY_IO_ERROR))) {
+ if (tty->flags & (1 << TTY_IO_ERROR)) {
+ port->flags |= ASYNC_NORMAL_ACTIVE;
+ return 0;
+ }
+ if (filp->f_flags & O_NONBLOCK) {
/* Indicate we are open */
if (tty->termios->c_cflag & CBAUD)
tty_port_raise_dtr_rts(port);