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serial: sc16is7xx: remove obsolete loop in sc16is7xx_port_irq() 

Commit 8344498721 ("sc16is7xx: Fix for multi-channel stall") changed
sc16is7xx_port_irq() from looping multiple times when there was still
interrupts to serve. It simply changed the do {} while(1) loop to a
do {} while(0) loop, which makes the loop itself now obsolete.

Clean the code by removing this obsolete do {} while(0) loop.

Fixes: 8344498721 ("sc16is7xx: Fix for multi-channel stall")
Cc:  <stable@vger.kernel.org>
Suggested-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>
Link: https://lore.kernel.org/r/20231221231823.2327894-5-hugo@hugovil.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hugo Villeneuve 2023-12-21 18:18:11 -05:00 committed by Greg Kroah-Hartman
parent 3ef79cd141
commit ed647256e8
1 changed files with 39 additions and 42 deletions
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5
drivers/tty/serial/sc16is7xx.c
View File

@ -725,14 +725,12 @@ static void sc16is7xx_update_mlines(struct sc16is7xx_one *one)
static bool sc16is7xx_port_irq(struct sc16is7xx_port *s, int portno)
{
bool rc = true;
unsigned int iir, rxlen;
struct uart_port *port = &s->p[portno].port;
struct sc16is7xx_one *one = to_sc16is7xx_one(port, port);
mutex_lock(&one->efr_lock);
do {
unsigned int iir, rxlen;
iir = sc16is7xx_port_read(port, SC16IS7XX_IIR_REG);
if (iir & SC16IS7XX_IIR_NO_INT_BIT) {
rc = false;
@ -776,7 +774,6 @@ static bool sc16is7xx_port_irq(struct sc16is7xx_port *s, int portno)
port->line, iir);
break;
}
} while (0);
out_port_irq:
mutex_unlock(&one->efr_lock);