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pinctrl: mcp23s08: Improve unlocking of a mutex in mcp23s08_irq()

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* Add a jump target so that a call of the function "mutex_unlock" is stored
  only twice in this function implementation.

* Replace five calls by goto statements.

* Adjust five condition checks.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Markus Elfring 2017-10-30 16:03:12 +01:00 committed by Linus Walleij
parent cb5fda413e
commit 7f6f50dfb5
1 changed files with 15 additions and 20 deletions
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35
drivers/pinctrl/pinctrl-mcp23s08.c
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@ -455,31 +455,22 @@ static irqreturn_t mcp23s08_irq(int irq, void *data)
defval_changed, gpio_set;
mutex_lock(&mcp->lock);
if (mcp_read(mcp, MCP_INTF, &intf) < 0) {
mutex_unlock(&mcp->lock);
return IRQ_HANDLED;
}
if (mcp_read(mcp, MCP_INTF, &intf))
goto unlock;
if (mcp_read(mcp, MCP_INTCAP, &intcap) < 0) {
mutex_unlock(&mcp->lock);
return IRQ_HANDLED;
}
if (mcp_read(mcp, MCP_INTCAP, &intcap))
goto unlock;
if (mcp_read(mcp, MCP_INTCON, &intcon) < 0) {
mutex_unlock(&mcp->lock);
return IRQ_HANDLED;
}
if (mcp_read(mcp, MCP_INTCON, &intcon))
goto unlock;
if (mcp_read(mcp, MCP_DEFVAL, &defval) < 0) {
mutex_unlock(&mcp->lock);
return IRQ_HANDLED;
}
if (mcp_read(mcp, MCP_DEFVAL, &defval))
goto unlock;
/* This clears the interrupt(configurable on S18) */
if (mcp_read(mcp, MCP_GPIO, &gpio) < 0) {
mutex_unlock(&mcp->lock);
return IRQ_HANDLED;
}
if (mcp_read(mcp, MCP_GPIO, &gpio))
goto unlock;
gpio_orig = mcp->cached_gpio;
mcp->cached_gpio = gpio;
mutex_unlock(&mcp->lock);
@ -541,6 +532,10 @@ static irqreturn_t mcp23s08_irq(int irq, void *data)
}
return IRQ_HANDLED;
unlock:
mutex_unlock(&mcp->lock);
return IRQ_HANDLED;
}
static void mcp23s08_irq_mask(struct irq_data *data)