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serial: Fix send_xchar() handlers

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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>
This commit is contained in:
Peter Hurley
2014-09-02 17:39:15 -04:00
committed by Greg Kroah-Hartman
parent fba594a848
commit db106df32d
3 changed files with 8 additions and 0 deletions
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Documentation/serial/driver
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@@ -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.