| From | Kamal Mostafa <> | Subject | [PATCH 3.13.y-ckt 024/143] tty/serial: at91: fix error handling in atmel_serial_probe() | Date | Tue, 31 Mar 2015 12:46:29 -0700 |
| |
3.13.11-ckt18 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Cyrille Pitchen <cyrille.pitchen@atmel.com>
commit 6fbb9bdf0f3fbe23aeff806489791aa876adaffb upstream.
-EDEFER error wasn't handle properly by atmel_serial_probe(). As an example, when atmel_serial_probe() is called for the first time, we pass the test_and_set_bit() test to check whether the port has already been initalized. Then we call atmel_init_port(), which may return -EDEFER, possibly returned before by clk_get(). Consequently atmel_serial_probe() used to return this error code WITHOUT clearing the port bit in the "atmel_ports_in_use" mask. When atmel_serial_probe() was called for the second time, it used to fail on the test_and_set_bit() function then returning -EBUSY.
When atmel_serial_probe() fails, this patch make it clear the port bit in the "atmel_ports_in_use" mask, if needed, before returning the error code.
Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com> Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Kamal Mostafa <kamal@canonical.com> --- drivers/tty/serial/atmel_serial.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c index 41060fb..52ada70 100644 --- a/drivers/tty/serial/atmel_serial.c +++ b/drivers/tty/serial/atmel_serial.c @@ -2392,7 +2392,7 @@ static int atmel_serial_probe(struct platform_device *pdev) ret = atmel_init_port(port, pdev); if (ret) - goto err; + goto err_clear_bit; if (!atmel_use_pdc_rx(&port->uart)) { ret = -ENOMEM; @@ -2453,6 +2453,8 @@ err_alloc_ring: clk_put(port->clk); port->clk = NULL; } +err_clear_bit: + clear_bit(port->uart.line, atmel_ports_in_use); err: return ret; } -- 1.9.1
|