mxc : BUG in imx_dma_request

On MX2 platforms imx_dma_request() calls request_irq() which may sleep
with interrupts disabled.

Signed-off-by: Martin Fuzzey <mfuzzey@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 4 insertions, 8 deletions

diff --git a/arch/arm/plat-mxc/dma-mx1-mx2.c b/arch/arm/plat-mxc/dma-mx1-mx2.c
index a9126ed7935a..77646436c00e 100644
--- a/arch/arm/plat-mxc/dma-mx1-mx2.c
+++ b/arch/arm/plat-mxc/dma-mx1-mx2.c
@@ -693,12 +693,15 @@ int imx_dma_request(int channel, const char *name)
                 local_irq_restore(flags);
                 return -EBUSY;
         }
+        memset(imxdma, 0, sizeof(imxdma));
+        imxdma->name = name;
+        local_irq_restore(flags); /* request_irq() can block */
 
 #ifdef CONFIG_ARCH_MX2
         ret = request_irq(MXC_INT_DMACH0 + channel, dma_irq_handler, 0, "DMA",
                         NULL);
         if (ret) {
-                local_irq_restore(flags);
+                imxdma->name = NULL;
                 printk(KERN_CRIT "Can't register IRQ %d for DMA channel %d\n",
                                 MXC_INT_DMACH0 + channel, channel);
                 return ret;
@@ -708,13 +711,6 @@ int imx_dma_request(int channel, const char *name)
         imxdma->watchdog.data = channel;
 #endif
 
-        imxdma->name = name;
-        imxdma->irq_handler = NULL;
-        imxdma->err_handler = NULL;
-        imxdma->data = NULL;
-        imxdma->sg = NULL;
-
-        local_irq_restore(flags);
         return ret;
 }
 EXPORT_SYMBOL(imx_dma_request);