Merge branch 'dma_slave_direction' into next_test_dirn

[platform/adaptation/renesas_rcar/renesas_kernel.git] / drivers / video / mx3fb.c

diff --git a/drivers/video/mx3fb.c b/drivers/video/mx3fb.c
index bd76858..1981e36 100644 (file)
--- a/drivers/video/mx3fb.c
+++ b/drivers/video/mx3fb.c
@@ -334,7 +334,7 @@ static void sdc_enable_channel(struct mx3fb_info *mx3_fbi)
        /* This enables the channel */
        if (mx3_fbi->cookie < 0) {
                mx3_fbi->txd = dma_chan->device->device_prep_slave_sg(dma_chan,
-                     &mx3_fbi->sg[0], 1, DMA_TO_DEVICE, DMA_PREP_INTERRUPT);
+                     &mx3_fbi->sg[0], 1, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
                if (!mx3_fbi->txd) {
                        dev_err(mx3fb->dev, "Cannot allocate descriptor on %d\n",
                                dma_chan->chan_id);
@@ -382,6 +382,9 @@ static void sdc_disable_channel(struct mx3fb_info *mx3_fbi)
        uint32_t enabled;
        unsigned long flags;
 
+       if (mx3_fbi->txd == NULL)
+               return;
+
        spin_lock_irqsave(&mx3fb->lock, flags);
 
        enabled = sdc_fb_uninit(mx3_fbi);
@@ -986,9 +989,19 @@ static void __blank(int blank, struct fb_info *fbi)
 {
        struct mx3fb_info *mx3_fbi = fbi->par;
        struct mx3fb_data *mx3fb = mx3_fbi->mx3fb;
+       int was_blank = mx3_fbi->blank;
 
        mx3_fbi->blank = blank;
 
+       /* Attention!
+        * Do not call sdc_disable_channel() for a channel that is disabled
+        * already! This will result in a kernel NULL pointer dereference
+        * (mx3_fbi->txd is NULL). Hide the fact, that all blank modes are
+        * handled equally by this driver.
+        */
+       if (blank > FB_BLANK_UNBLANK && was_blank > FB_BLANK_UNBLANK)
+               return;
+
        switch (blank) {
        case FB_BLANK_POWERDOWN:
        case FB_BLANK_VSYNC_SUSPEND:
@@ -1104,7 +1117,7 @@ static int mx3fb_pan_display(struct fb_var_screeninfo *var,
                async_tx_ack(mx3_fbi->txd);
 
        txd = dma_chan->device->device_prep_slave_sg(dma_chan, sg +
-               mx3_fbi->cur_ipu_buf, 1, DMA_TO_DEVICE, DMA_PREP_INTERRUPT);
+               mx3_fbi->cur_ipu_buf, 1, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT);
        if (!txd) {
                dev_err(fbi->device,
                        "Error preparing a DMA transaction descriptor.\n");