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staging: dgnc: replace dgnc_offset_table with bit shift. 

the dgnc_offset_table has a same value with (1 << port).
So I tried to replace dgnc_offset_table array with 1 << port.
And also there are redundant assignments(tmp and current_port)
inside while loop for checking uart port, and remove them.

Signed-off-by: Daeseok Youn <daeseok.youn@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Daeseok Youn 2016-03-28 13:54:15 +09:00 committed by Greg Kroah-Hartman
parent e078cb2a64
commit d8bf4bee49
1 changed files with 12 additions and 32 deletions
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44
drivers/staging/dgnc/dgnc_neo.c
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@ -77,9 +77,6 @@ struct board_ops dgnc_neo_ops = {
.send_immediate_char = neo_send_immediate_char
};
static uint dgnc_offset_table[8] = { 0x01, 0x02, 0x04, 0x08,
0x10, 0x20, 0x40, 0x80 };
/*
* This function allows calls to ensure that all outstanding
* PCI writes have been completed, by doing a PCI read against
@ -923,9 +920,7 @@ static irqreturn_t neo_intr(int irq, void *voidbrd)
struct dgnc_board *brd = voidbrd;
struct channel_t *ch;
int port = 0;
int type = 0;
int current_port;
u32 tmp;
int type;
u32 uart_poll;
unsigned long flags;
unsigned long flags2;
@ -960,29 +955,12 @@ static irqreturn_t neo_intr(int irq, void *voidbrd)
/* At this point, we have at least SOMETHING to service, dig further... */
current_port = 0;
/* Loop on each port */
while ((uart_poll & 0xff) != 0) {
tmp = uart_poll;
type = uart_poll >> (8 + (port * 3));
type &= 0x7;
/* Check current port to see if it has interrupt pending */
if ((tmp & dgnc_offset_table[current_port]) != 0) {
port = current_port;
type = tmp >> (8 + (port * 3));
type &= 0x7;
} else {
current_port++;
continue;
}
/* Remove this port + type from uart_poll */
uart_poll &= ~(dgnc_offset_table[port]);
if (!type) {
/* If no type, just ignore it, and move onto next port */
continue;
}
uart_poll &= ~(0x01 << port);
/* Switch on type of interrupt we have */
switch (type) {
@ -994,7 +972,7 @@ static irqreturn_t neo_intr(int irq, void *voidbrd)
/* Verify the port is in range. */
if (port >= brd->nasync)
continue;
break;
ch = brd->channels[port];
neo_copy_data_from_uart_to_queue(ch);
@ -1004,14 +982,14 @@ static irqreturn_t neo_intr(int irq, void *voidbrd)
dgnc_check_queue_flow_control(ch);
spin_unlock_irqrestore(&ch->ch_lock, flags2);
continue;
break;
case UART_17158_RX_LINE_STATUS:
/*
* RXRDY and RX LINE Status (logic OR of LSR[4:1])
*/
neo_parse_lsr(brd, port);
continue;
break;
case UART_17158_TXRDY:
/*
@ -1027,14 +1005,14 @@ static irqreturn_t neo_intr(int irq, void *voidbrd)
* it should be, I was getting things like RXDY too. Weird.
*/
neo_parse_isr(brd, port);
continue;
break;
case UART_17158_MSR:
/*
* MSR or flow control was seen.
*/
neo_parse_isr(brd, port);
continue;
break;
default:
/*
@ -1043,8 +1021,10 @@ static irqreturn_t neo_intr(int irq, void *voidbrd)
* these once and awhile.
* Its harmless, just ignore it and move on.
*/
continue;
break;
}
port++;
}
/*