From c4b0afee3c1730cf9b0f6ad21729928d23d3918e Mon Sep 17 00:00:00 2001 From: Jarod Wilson Date: Mon, 13 Jun 2011 15:32:26 -0300 Subject: [PATCH] [media] [staging] lirc_serial: allocate irq at init time There's really no good reason not to just grab the desired IRQ at driver init time, instead of every time the lirc device node is accessed. This also improves the speed and reliability with which a serial transmitter can operate, as back-to-back transmission attempts (i.e., channel change to a multi-digit channel) don't have to spend time acquiring and then releasing the IRQ for every digit, sometimes multiple times, if lircd has been told to use the min_repeat parameter. CC: devel@driverdev.osuosl.org Signed-off-by: Jarod Wilson Signed-off-by: Mauro Carvalho Chehab --- drivers/staging/lirc/lirc_serial.c | 44 ++++++++++++++---------------- 1 file changed, 21 insertions(+), 23 deletions(-) diff --git a/drivers/staging/lirc/lirc_serial.c b/drivers/staging/lirc/lirc_serial.c index 4a3cca03224a..805df913bb6e 100644 --- a/drivers/staging/lirc/lirc_serial.c +++ b/drivers/staging/lirc/lirc_serial.c @@ -838,7 +838,23 @@ static int hardware_init_port(void) static int init_port(void) { - int i, nlow, nhigh; + int i, nlow, nhigh, result; + + result = request_irq(irq, irq_handler, + IRQF_DISABLED | (share_irq ? IRQF_SHARED : 0), + LIRC_DRIVER_NAME, (void *)&hardware); + + switch (result) { + case -EBUSY: + printk(KERN_ERR LIRC_DRIVER_NAME ": IRQ %d busy\n", irq); + return -EBUSY; + case -EINVAL: + printk(KERN_ERR LIRC_DRIVER_NAME + ": Bad irq number or handler\n"); + return -EINVAL; + default: + break; + }; /* Reserve io region. */ /* @@ -893,34 +909,17 @@ static int init_port(void) printk(KERN_INFO LIRC_DRIVER_NAME ": Manually using active " "%s receiver\n", sense ? "low" : "high"); + dprintk("Interrupt %d, port %04x obtained\n", irq, io); return 0; } static int set_use_inc(void *data) { - int result; unsigned long flags; /* initialize timestamp */ do_gettimeofday(&lasttv); - result = request_irq(irq, irq_handler, - IRQF_DISABLED | (share_irq ? IRQF_SHARED : 0), - LIRC_DRIVER_NAME, (void *)&hardware); - - switch (result) { - case -EBUSY: - printk(KERN_ERR LIRC_DRIVER_NAME ": IRQ %d busy\n", irq); - return -EBUSY; - case -EINVAL: - printk(KERN_ERR LIRC_DRIVER_NAME - ": Bad irq number or handler\n"); - return -EINVAL; - default: - dprintk("Interrupt %d, port %04x obtained\n", irq, io); - break; - } - spin_lock_irqsave(&hardware[type].lock, flags); /* Set DLAB 0. */ @@ -945,10 +944,6 @@ static void set_use_dec(void *data) soutp(UART_IER, sinp(UART_IER) & (~(UART_IER_MSI|UART_IER_RLSI|UART_IER_THRI|UART_IER_RDI))); spin_unlock_irqrestore(&hardware[type].lock, flags); - - free_irq(irq, (void *)&hardware); - - dprintk("freed IRQ %d\n", irq); } static ssize_t lirc_write(struct file *file, const char *buf, @@ -1256,6 +1251,9 @@ exit_serial_exit: static void __exit lirc_serial_exit_module(void) { lirc_serial_exit(); + + free_irq(irq, (void *)&hardware); + if (iommap != 0) release_mem_region(iommap, 8 << ioshift); else