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| author | Peter Hurley <peter@hurleysoftware.com> | 2014-09-02 23:39:15 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-09-09 01:22:42 +0200 |
| commit | db106df32d679db151b48a09543b03ee41cb2580 (patch) | |
| tree | bef38581727c0696e7aac02df61ceb9a8a093685 /Documentation | |
| parent | serial: core: Remove unsafe x_char optimization (diff) | |
| download | linux-db106df32d679db151b48a09543b03ee41cb2580.tar.xz linux-db106df32d679db151b48a09543b03ee41cb2580.zip | |
serial: Fix send_xchar() handlers
START_CHAR() & STOP_CHAR() can be disabled if set to '\0'
(__DISABLED_CHAR). UART drivers which define a send_xchar()
handler must not transmit __DISABLED_CHAR.
Document requirement.
Affected drivers:
sunsab
sunhv
cc: David S. Miller <davem@davemloft.net>
cc: <sparclinux@vger.kernel.org>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/serial/driver | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/Documentation/serial/driver b/Documentation/serial/driver index 3bba1aeb799c..ba64e4b892e9 100644 --- a/Documentation/serial/driver +++ b/Documentation/serial/driver @@ -140,6 +140,8 @@ hardware. will append the character to the circular buffer and then call start_tx() / stop_tx() to flush the data out. + Do not transmit if ch == '\0' (__DISABLED_CHAR). + Locking: none. Interrupts: caller dependent. |