From fcc2fac60a95b4e63682ae4128e86d8768602fab Mon Sep 17 00:00:00 2001 From: Shubhrajyoti Datta Date: Wed, 17 Jun 2015 20:48:12 +0530 Subject: [PATCH] i2c: xiic: move the xiic_process to thread context The xiic_process is a 154 line code that runs in isr context currently move it to thread context. Also the name xiic_process suggests that the intension was to run in process context. Signed-off-by: Shubhrajyoti Datta [wsa: initialized irqreturn_t to IRQ_NONE instead of IRQ_HANDLED] Signed-off-by: Wolfram Sang --- drivers/i2c/busses/i2c-xiic.c | 33 ++++++++++++++++++++------------- 1 file changed, 20 insertions(+), 13 deletions(-) diff --git a/drivers/i2c/busses/i2c-xiic.c b/drivers/i2c/busses/i2c-xiic.c index 912780a3a65e..3664dffdcab7 100644 --- a/drivers/i2c/busses/i2c-xiic.c +++ b/drivers/i2c/busses/i2c-xiic.c @@ -358,8 +358,9 @@ static void xiic_wakeup(struct xiic_i2c *i2c, int code) wake_up(&i2c->wait); } -static void xiic_process(struct xiic_i2c *i2c) +static irqreturn_t xiic_process(int irq, void *dev_id) { + struct xiic_i2c *i2c = dev_id; u32 pend, isr, ier; u32 clr = 0; @@ -368,6 +369,7 @@ static void xiic_process(struct xiic_i2c *i2c) * To find which interrupts are pending; AND interrupts pending with * interrupts masked. */ + spin_lock(&i2c->lock); isr = xiic_getreg32(i2c, XIIC_IISR_OFFSET); ier = xiic_getreg32(i2c, XIIC_IIER_OFFSET); pend = isr & ier; @@ -378,11 +380,6 @@ static void xiic_process(struct xiic_i2c *i2c) __func__, xiic_getreg8(i2c, XIIC_SR_REG_OFFSET), i2c->tx_msg, i2c->nmsgs); - /* Do not processes a devices interrupts if the device has no - * interrupts pending - */ - if (!pend) - return; /* Service requesting interrupt */ if ((pend & XIIC_INTR_ARB_LOST_MASK) || @@ -502,6 +499,8 @@ out: dev_dbg(i2c->adap.dev.parent, "%s clr: 0x%x\n", __func__, clr); xiic_setreg32(i2c, XIIC_IISR_OFFSET, clr); + spin_unlock(&i2c->lock); + return IRQ_HANDLED; } static int xiic_bus_busy(struct xiic_i2c *i2c) @@ -602,16 +601,21 @@ static void xiic_start_send(struct xiic_i2c *i2c) static irqreturn_t xiic_isr(int irq, void *dev_id) { struct xiic_i2c *i2c = dev_id; - - spin_lock(&i2c->lock); + u32 pend, isr, ier; + irqreturn_t ret = IRQ_NONE; + /* Do not processes a devices interrupts if the device has no + * interrupts pending + */ dev_dbg(i2c->adap.dev.parent, "%s entry\n", __func__); - xiic_process(i2c); - - spin_unlock(&i2c->lock); + isr = xiic_getreg32(i2c, XIIC_IISR_OFFSET); + ier = xiic_getreg32(i2c, XIIC_IIER_OFFSET); + pend = isr & ier; + if (pend) + ret = IRQ_WAKE_THREAD; - return IRQ_HANDLED; + return ret; } static void __xiic_start_xfer(struct xiic_i2c *i2c) @@ -752,7 +756,10 @@ static int xiic_i2c_probe(struct platform_device *pdev) spin_lock_init(&i2c->lock); init_waitqueue_head(&i2c->wait); - ret = devm_request_irq(&pdev->dev, irq, xiic_isr, 0, pdev->name, i2c); + ret = devm_request_threaded_irq(&pdev->dev, irq, xiic_isr, + xiic_process, IRQF_ONESHOT, + pdev->name, i2c); + if (ret < 0) { dev_err(&pdev->dev, "Cannot claim IRQ\n"); return ret; -- 2.20.1