Revert "rk: cma: attempt to allocate same range memory while cma allocation failure"

This reverts commit 17beed5e65.

arch/arm/configs/rockchip_defconfig

@@ -209,7 +209,6 @@ CONFIG_RFKILL=y
 CONFIG_RFKILL_RK=y
 CONFIG_DEVTMPFS=y
 CONFIG_DMA_CMA=y
-CONFIG_CMA_ALLOC_RETRY=20
 CONFIG_BLK_DEV_LOOP=y
 CONFIG_UID_STAT=y
 CONFIG_SRAM=y

drivers/base/Kconfig

@@ -278,14 +278,6 @@ config CMA_AREAS
 
 	  If unsure, leave the default value "7".
 
-config CMA_ALLOC_RETRY
-	int "Maximum count to retry of the CMA Allocation"
-	depends on ARCH_ROCKCHIP
-	default 20
-	help
-	  CMA allocation range may be busy at this time, we can try again a few
-	  time to make allocate successful.
-
 endif
 
 endmenu

drivers/base/dma-contiguous.c

@@ -297,18 +297,12 @@ struct page *dma_alloc_from_contiguous(struct device *dev, int count,
 	mutex_lock(&cma_mutex);
 
 	for (;;) {
-#ifdef CONFIG_CMA_ALLOC_RETRY
-		int retry = 0;
-#endif
 		pageno = bitmap_find_next_zero_area(cma->bitmap, cma->count,
 						    start, count, mask);
 		if (pageno >= cma->count)
 			break;
 
 		pfn = cma->base_pfn + pageno;
-#ifdef CONFIG_CMA_ALLOC_RETRY
-		do {
-#endif
 		ret = alloc_contig_range(pfn, pfn + count, MIGRATE_CMA);
 		if (ret == 0) {
 			bitmap_set(cma->bitmap, pageno, count);
@@ -317,12 +311,6 @@ struct page *dma_alloc_from_contiguous(struct device *dev, int count,
 		} else if (ret != -EBUSY) {
 			break;
 		}
-#ifdef CONFIG_CMA_ALLOC_RETRY
-		}while (++retry<=CONFIG_CMA_ALLOC_RETRY);
-
-		if (retry<=CONFIG_CMA_ALLOC_RETRY)
-			break;
-#endif
 		pr_debug("%s(): memory range at %p is busy, retrying\n",
 			 __func__, pfn_to_page(pfn));
 		/* try again with a bit different memory target */