linux-kernel - [PATCH 6/8] drivers:misc: ti-st: wait for completion at fail

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Message-ID: <1312989517-28604-7-git-send-email-pavan_savoy@ti.com>
Date:	Wed, 10 Aug 2011 10:18:35 -0500
From:	<pavan_savoy@...com>
To:	<gregkh@...e.de>, <linux-kernel@...r.kernel.org>
CC:	<pavan_savoy@...y.com>, Pavan Savoy <pavan_savoy@...com>
Subject: [PATCH 6/8] drivers:misc: ti-st: wait for completion at fail

From: Pavan Savoy <pavan_savoy@...com>

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@...com>
---
 drivers/misc/ti-st/st_kim.c |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/drivers/misc/ti-st/st_kim.c b/drivers/misc/ti-st/st_kim.c
index 8061103..ee20fa9 100644
--- a/drivers/misc/ti-st/st_kim.c
+++ b/drivers/misc/ti-st/st_kim.c
@@ -474,6 +474,12 @@ 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 {
@@ -486,6 +492,13 @@ 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;
-- 
1.7.4.1

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