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authorFelipe Balbi <balbi@ti.com>2011-03-21 13:25:08 +0300
committerGreg Kroah-Hartman <gregkh@suse.de>2011-04-23 04:31:53 +0400
commitb1c43f82c5aa265442f82dba31ce985ebb7aa71c (patch)
tree8b344d8d5355b30e8deff901180edc708a653227 /drivers/tty/tty_buffer.c
parente9a470f445271eb157ee860a93b062324402fc3a (diff)
downloadlinux-b1c43f82c5aa265442f82dba31ce985ebb7aa71c.tar.xz
tty: make receive_buf() return the amout of bytes received
it makes it simpler to keep track of the amount of bytes received and simplifies how flush_to_ldisc counts the remaining bytes. It also fixes a bug of lost bytes on n_tty when flushing too many bytes via the USB serial gadget driver. Tested-by: Stefan Bigler <stefan.bigler@keymile.com> Tested-by: Toby Gray <toby.gray@realvnc.com> Signed-off-by: Felipe Balbi <balbi@ti.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/tty/tty_buffer.c')
-rw-r--r--drivers/tty/tty_buffer.c15
1 files changed, 9 insertions, 6 deletions
diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c
index f1a7918d71aa..46de2e075dac 100644
--- a/drivers/tty/tty_buffer.c
+++ b/drivers/tty/tty_buffer.c
@@ -416,6 +416,7 @@ static void flush_to_ldisc(struct work_struct *work)
struct tty_buffer *head, *tail = tty->buf.tail;
int seen_tail = 0;
while ((head = tty->buf.head) != NULL) {
+ int copied;
int count;
char *char_buf;
unsigned char *flag_buf;
@@ -442,17 +443,19 @@ static void flush_to_ldisc(struct work_struct *work)
line discipline as we want to empty the queue */
if (test_bit(TTY_FLUSHPENDING, &tty->flags))
break;
- if (!tty->receive_room || seen_tail)
- break;
- if (count > tty->receive_room)
- count = tty->receive_room;
char_buf = head->char_buf_ptr + head->read;
flag_buf = head->flag_buf_ptr + head->read;
- head->read += count;
spin_unlock_irqrestore(&tty->buf.lock, flags);
- disc->ops->receive_buf(tty, char_buf,
+ copied = disc->ops->receive_buf(tty, char_buf,
flag_buf, count);
spin_lock_irqsave(&tty->buf.lock, flags);
+
+ head->read += copied;
+
+ if (copied == 0 || seen_tail) {
+ schedule_work(&tty->buf.work);
+ break;
+ }
}
clear_bit(TTY_FLUSHING, &tty->flags);
}