drivers:misc: ti-st: wait for completion at fail

When the line discipline install fails for reasons such as missing user-space
UIM or broken communication between UIM and ST driver, then the ST
attempts/retries to request for ldisc installation again.

Signed-off-by: Pavan Savoy <pavan_savoy@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/misc/ti-st/st_kim.c b/drivers/misc/ti-st/st_kim.c
index 1748a93..d8ca406 100644 (file)
--- a/drivers/misc/ti-st/st_kim.c
+++ b/drivers/misc/ti-st/st_kim.c
@@ -473,6 +473,12 @@ long st_kim_start(void *kim_data)
                        pr_info("ldisc_install = 0");
                        sysfs_notify(&kim_gdata->kim_pdev->dev.kobj,
                                        NULL, "install");
+                       /* the following wait is never going to be completed,
+                        * since the ldisc was never installed, hence serving
+                        * as a mdelay of LDISC_TIME msecs */
+                       err = wait_for_completion_timeout
+                               (&kim_gdata->ldisc_installed,
+                                msecs_to_jiffies(LDISC_TIME));
                        err = -ETIMEDOUT;
                        continue;
                } else {
@@ -485,6 +491,13 @@ long st_kim_start(void *kim_data)
                                pr_info("ldisc_install = 0");
                                sysfs_notify(&kim_gdata->kim_pdev->dev.kobj,
                                                NULL, "install");
+                               /* this wait might be completed, though in the
+                                * tty_close() since the ldisc is already
+                                * installed */
+                               err = wait_for_completion_timeout
+                                       (&kim_gdata->ldisc_installed,
+                                        msecs_to_jiffies(LDISC_TIME));
+                               err = -EINVAL;
                                continue;
                        } else {        /* on success don't retry */
                                break;