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tty/serial: Skip 'NULL' char after console break when sysrq enabled 

When sysrq is triggered from console, serial driver for SUN hypervisor
console receives a console break and enables the sysrq. It expects a valid
sysrq char following with break. Meanwhile if driver receives 'NULL'
ASCII char then it disables sysrq and sysrq handler will never be invoked.

This fix skips calling uart sysrq handler when 'NULL' is received while
sysrq is enabled.

Signed-off-by: Vijay Kumar <vijay.ac.kumar@oracle.com>
Acked-by: Karl Volz <karl.volz@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vijay Kumar 2015-12-23 10:55:33 -08:00 committed by David S. Miller
parent a7c5724b5c
commit 079317a65d
1 changed files with 4 additions and 2 deletions
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6
drivers/tty/serial/sunhv.c
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@ -148,8 +148,10 @@ static int receive_chars_read(struct uart_port *port)
uart_handle_dcd_change(port, 1);
}
for (i = 0; i < bytes_read; i++)
uart_handle_sysrq_char(port, con_read_page[i]);
if (port->sysrq != 0 && *con_read_page) {
for (i = 0; i < bytes_read; i++)
uart_handle_sysrq_char(port, con_read_page[i]);
}
if (port->state == NULL)
continue;