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| author | Jingoo Han <jg1.han@samsung.com> | 2011-04-11 07:25:37 +0000 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2011-04-11 09:38:50 -0700 |
| commit | b07f3bbee12163a6b48991138a37b87a1126462a (patch) | |
| tree | 006e82afdbe25dd92999547dffe3c5abbe5e383c /drivers/video/s3c-fb.c | |
| parent | 0d60b281dc7fd2ae7ec6463f916138fd2d182bee (diff) | |
| download | lwn-b07f3bbee12163a6b48991138a37b87a1126462a.tar.gz lwn-b07f3bbee12163a6b48991138a37b87a1126462a.zip | |
video: s3c-fb: add spinlock to interrupt routine
The spinlock is added to interrupt routine to ensure that the driver
is protected against multiple accesses.
Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'drivers/video/s3c-fb.c')
| -rw-r--r-- | drivers/video/s3c-fb.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/video/s3c-fb.c b/drivers/video/s3c-fb.c index 2d075f0684d9..3fa7911ac906 100644 --- a/drivers/video/s3c-fb.c +++ b/drivers/video/s3c-fb.c @@ -182,6 +182,7 @@ struct s3c_fb_vsync { /** * struct s3c_fb - overall hardware state of the hardware + * @slock: The spinlock protection for this data sturcture. * @dev: The device that we bound to, for printing, etc. * @regs_res: The resource we claimed for the IO registers. * @bus_clk: The clk (hclk) feeding our interface and possibly pixclk. @@ -195,6 +196,7 @@ struct s3c_fb_vsync { * @vsync_info: VSYNC-related information (count, queues...) */ struct s3c_fb { + spinlock_t slock; struct device *dev; struct resource *regs_res; struct clk *bus_clk; @@ -947,6 +949,8 @@ static irqreturn_t s3c_fb_irq(int irq, void *dev_id) void __iomem *regs = sfb->regs; u32 irq_sts_reg; + spin_lock(&sfb->slock); + irq_sts_reg = readl(regs + VIDINTCON1); if (irq_sts_reg & VIDINTCON1_INT_FRAME) { @@ -963,6 +967,7 @@ static irqreturn_t s3c_fb_irq(int irq, void *dev_id) */ s3c_fb_disable_irq(sfb); + spin_unlock(&sfb->slock); return IRQ_HANDLED; } @@ -1339,6 +1344,8 @@ static int __devinit s3c_fb_probe(struct platform_device *pdev) sfb->pdata = pd; sfb->variant = fbdrv->variant; + spin_lock_init(&sfb->slock); + sfb->bus_clk = clk_get(dev, "lcd"); if (IS_ERR(sfb->bus_clk)) { dev_err(dev, "failed to get bus clock\n"); |