AcoSail/kernel_optimize_test
8
0
Fork 0
forked from luck/tmp_suning_uos_patched
Code Pull Requests Activity

serial/nwpserial: Fix wrong register read address and add interrupt acknowledge.

Browse Source 
The receive interrupt routine checks the wrong register if the
receive fifo is empty. Further an explicit interrupt acknowledge
write is introduced. In some circumstances another interrupt was
issued.

Signed-off-by: Benjamin Krill <ben@codiert.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Benjamin Krill 2009-05-13 05:56:54 +00:00 committed by Benjamin Herrenschmidt
parent 37cd8ed90f
commit 951c4df5b7
1 changed files with 3 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/serial/nwpserial.c
View File

@ -145,11 +145,13 @@ static irqreturn_t nwpserial_interrupt(int irq, void *dev_id)
ch = dcr_read(up->dcr_host, UART_RX);
if (up->port.ignore_status_mask != NWPSERIAL_STATUS_RXVALID)
tty_insert_flip_char(tty, ch, TTY_NORMAL);
} while (dcr_read(up->dcr_host, UART_RX) & UART_LSR_DR);
} while (dcr_read(up->dcr_host, UART_LSR) & UART_LSR_DR);
tty_flip_buffer_push(tty);
ret = IRQ_HANDLED;
/* clear interrupt */
dcr_write(up->dcr_host, UART_IIR, 1);
out:
spin_unlock(&up->port.lock);
return ret;