USB: cdc-acm: fix close_delay and closing_wait units in TIOCSSERIAL

[ Upstream commit 633e2b2ded739a34bd0fb1d8b5b871f7e489ea29 ]

close_delay and closing_wait are specified in hundredth of a second but stored
internally in jiffies. Use the jiffies_to_msecs() and msecs_to_jiffies()
functions to convert from each other.

Signed-off-by: Anthony Mallet <anthony.mallet@laas.fr>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200312133101.7096-1-anthony.mallet@laas.fr
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 59675cc..709884b 100644 (file)
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -914,10 +914,10 @@ static int get_serial_info(struct acm *acm, struct serial_struct __user *info)
        memset(&tmp, 0, sizeof(tmp));
        tmp.xmit_fifo_size = acm->writesize;
        tmp.baud_base = le32_to_cpu(acm->line.dwDTERate);
-       tmp.close_delay = acm->port.close_delay / 10;
+       tmp.close_delay = jiffies_to_msecs(acm->port.close_delay) / 10;
        tmp.closing_wait = acm->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
                                ASYNC_CLOSING_WAIT_NONE :
-                               acm->port.closing_wait / 10;
+                               jiffies_to_msecs(acm->port.closing_wait) / 10;
 
        if (copy_to_user(info, &tmp, sizeof(tmp)))
                return -EFAULT;
@@ -935,9 +935,10 @@ static int set_serial_info(struct acm *acm,
        if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
                return -EFAULT;
 
-       close_delay = new_serial.close_delay * 10;
+       close_delay = msecs_to_jiffies(new_serial.close_delay * 10);
        closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
-                       ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
+                       ASYNC_CLOSING_WAIT_NONE :
+                       msecs_to_jiffies(new_serial.closing_wait * 10);
 
        mutex_lock(&acm->port.mutex);