TononixOS/ubports_kernel_google_msm
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msm: tty: update receive room just before writing data to the ldisc

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There is a corner case in the tty driver where the value of
tty->receive_room is not being updated before writing data to
the line discipline. When this happens, data is lost because
of failure to re-submit any remaining data to the ldisc.

This fix is dependent on a new tty flag that is set only when
the tty driver is used for efs sync betweem the mdm modem and
the applications processor.

CRs-Fixed: 358868
Change-Id: I0ba02980504b4d8187b8c83111c2c883d194efa2
Signed-off-by: Joel King <joelking@codeaurora.org>
This commit is contained in:
Joel King
2012-07-11 16:18:54 -07:00
committed by Stephen Boyd
parent 8b6e5d26eb
commit aa1f4fe003
3 changed files with 30 additions and 2 deletions
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include/linux/tty.h
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@@ -282,8 +282,10 @@ struct tty_struct {
struct winsize winsize; /* termios mutex */
unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1;
unsigned char low_latency:1, warned:1;
unsigned char update_room_in_ldisc:1;
unsigned char ctrl_status; /* ctrl_lock */
unsigned int receive_room; /* Bytes free for queue */
unsigned int rr_bug;
struct tty_struct *link;
struct fasync_struct *fasync;