fbdev: sh_mobile_lcdc: Fix destruction of uninitialized mutex
If sh_mobile_lcdc_probe() fails after the allocation of driver-private
data, but before the initialization of all channels, a warning will be
printed due to the destruction of an uninitialized mutex:
WARNING: CPU: 0 PID: 1 at kernel/locking/mutex-debug.c:116 mutex_destroy+0x5c/0x7c()
DEBUG_LOCKS_WARN_ON(mutex_is_locked(lock))
...
Backtrace:
...
[<c00425b4>] (mutex_destroy) from [<c01d5858>] (sh_mobile_lcdc_remove+0x1bc/0x230)
r4:df6a4800 r3:00000000
[<c01d569c>] (sh_mobile_lcdc_remove) from [<c01d6620>] (sh_mobile_lcdc_probe+0xd54/0xe28)
Move the initialization of the mutexes from sh_mobile_lcdc_channel_init()
to immediately after the allocation of driver-private data to fix this.
Note that the interrupt number is moved to a new variable "irq", so we
can reuse the existing variable "i" for iterating over the channels.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
diff --git a/drivers/video/fbdev/sh_mobile_lcdcfb.c b/drivers/video/fbdev/sh_mobile_lcdcfb.c
index 23421ec..82c0a8c 100644
--- a/drivers/video/fbdev/sh_mobile_lcdcfb.c
+++ b/drivers/video/fbdev/sh_mobile_lcdcfb.c
@@ -2605,7 +2605,6 @@
unsigned int max_size;
unsigned int i;
- mutex_init(&ch->open_lock);
ch->notify = sh_mobile_lcdc_display_notify;
/* Validate the format. */
@@ -2704,7 +2703,7 @@
struct resource *res;
int num_channels;
int error;
- int i;
+ int irq, i;
if (!pdata) {
dev_err(&pdev->dev, "no platform data defined\n");
@@ -2712,8 +2711,8 @@
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- i = platform_get_irq(pdev, 0);
- if (!res || i < 0) {
+ irq = platform_get_irq(pdev, 0);
+ if (!res || irq < 0) {
dev_err(&pdev->dev, "cannot get platform resources\n");
return -ENOENT;
}
@@ -2726,16 +2725,18 @@
priv->dev = &pdev->dev;
priv->meram_dev = pdata->meram_dev;
+ for (i = 0; i < ARRAY_SIZE(priv->ch); i++)
+ mutex_init(&priv->ch[i].open_lock);
platform_set_drvdata(pdev, priv);
- error = request_irq(i, sh_mobile_lcdc_irq, 0,
+ error = request_irq(irq, sh_mobile_lcdc_irq, 0,
dev_name(&pdev->dev), priv);
if (error) {
dev_err(&pdev->dev, "unable to request irq\n");
goto err1;
}
- priv->irq = i;
+ priv->irq = irq;
atomic_set(&priv->hw_usecnt, -1);
for (i = 0, num_channels = 0; i < ARRAY_SIZE(pdata->ch); i++) {