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authorSebastian Andrzej Siewior <bigeasy@linutronix.de>2016-04-04 16:55:23 +0300
committerWolfram Sang <wsa@the-dreams.de>2016-04-24 23:33:09 +0300
commit126a66caec4a00b8d66dbc3174b0efa905cf68c3 (patch)
tree322ace0f7d425b5e4c663e6bfbced4b9969ba48d /drivers/i2c
parentafc34be05331962c2326c24bd0b47baff193b659 (diff)
downloadlinux-126a66caec4a00b8d66dbc3174b0efa905cf68c3.tar.xz
i2c: omap: drop the lock hard irq context
The lock is taken while reading two registers. On RT the first lock is taken in hard irq where it might sleep and in the threaded irq. The threaded irq runs in oneshot mode so the hard irq does not run until the thread the completes so there is no reason to grab the lock. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> [grygorii.strashko@ti.com: drop locking from isr completely and remove lock field from struct omap_i2c_dev] Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/busses/i2c-omap.c12
1 files changed, 1 insertions, 11 deletions
diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index 13c45296ce5b..ab1279b8e240 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c
@@ -185,7 +185,6 @@ enum {
#define OMAP_I2C_IP_V2_INTERRUPTS_MASK 0x6FFF
struct omap_i2c_dev {
- spinlock_t lock; /* IRQ synchronization */
struct device *dev;
void __iomem *base; /* virtual */
int irq;
@@ -995,15 +994,12 @@ omap_i2c_isr(int irq, void *dev_id)
u16 mask;
u16 stat;
- spin_lock(&omap->lock);
- mask = omap_i2c_read_reg(omap, OMAP_I2C_IE_REG);
stat = omap_i2c_read_reg(omap, OMAP_I2C_STAT_REG);
+ mask = omap_i2c_read_reg(omap, OMAP_I2C_IE_REG);
if (stat & mask)
ret = IRQ_WAKE_THREAD;
- spin_unlock(&omap->lock);
-
return ret;
}
@@ -1011,12 +1007,10 @@ static irqreturn_t
omap_i2c_isr_thread(int this_irq, void *dev_id)
{
struct omap_i2c_dev *omap = dev_id;
- unsigned long flags;
u16 bits;
u16 stat;
int err = 0, count = 0;
- spin_lock_irqsave(&omap->lock, flags);
do {
bits = omap_i2c_read_reg(omap, OMAP_I2C_IE_REG);
stat = omap_i2c_read_reg(omap, OMAP_I2C_STAT_REG);
@@ -1142,8 +1136,6 @@ omap_i2c_isr_thread(int this_irq, void *dev_id)
omap_i2c_complete_cmd(omap, err);
out:
- spin_unlock_irqrestore(&omap->lock, flags);
-
return IRQ_HANDLED;
}
@@ -1330,8 +1322,6 @@ omap_i2c_probe(struct platform_device *pdev)
omap->dev = &pdev->dev;
omap->irq = irq;
- spin_lock_init(&omap->lock);
-
platform_set_drvdata(pdev, omap);
init_completion(&omap->cmd_complete);