[PATCH v2 5/5] staging: dgap: tty.c: removes smatch warning "unsigned '--un->un_open_count' is never less than zero"

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



This patch removes this smatch warning:
unsigned '--un->un_open_count' is never less than zero

The code decremented the un_open_count variable
and tested to see if it was less than zero. Because
un_open_count is unsigned and can't be below zero,
this test didn't work.

Signed-off-by: Lidza Louina <lidza.louina@xxxxxxxxx>
---
 drivers/staging/dgap/dgap_tty.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/staging/dgap/dgap_tty.c b/drivers/staging/dgap/dgap_tty.c
index 3e12ddb..c0258db 100644
--- a/drivers/staging/dgap/dgap_tty.c
+++ b/drivers/staging/dgap/dgap_tty.c
@@ -1446,13 +1446,11 @@ static void dgap_tty_close(struct tty_struct *tty, struct file *file)
 		APR(("tty->count is 1, un open count is %d\n", un->un_open_count));
 		un->un_open_count = 1;
 	}  
-
-	if (--un->un_open_count < 0) {
+	if (un->un_open_count == 0) {
 		APR(("bad serial port open count of %d\n", un->un_open_count));
-		un->un_open_count = 0;
+		un->un_open_count = 1;
 	}
-
-	ch->ch_open_count--;
+	un->un_open_count--;
 
 	if (ch->ch_open_count && un->un_open_count) {
 		DPR_CLOSE(("dgap_tty_close: not last close ch: %d un:%d\n",
-- 
1.8.1.2

_______________________________________________
devel mailing list
devel@xxxxxxxxxxxxxxxxxxxxxx
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel




[Index of Archives]     [Linux Driver Backports]     [DMA Engine]     [Linux GPIO]     [Linux SPI]     [Video for Linux]     [Linux USB Devel]     [Linux Coverity]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [Yosemite Backpacking]
  Powered by Linux