Commit d680e2c1 authored Aug 04, 2012 by Arnd Bergmann

mtd/omap2: fix dmaengine_slave_config error handling



The newly added dmaengine support in the omap2 nand driver
potentially causes an undefined return value from the
omap_nand_probe function when dmaengine_slave_config
reports an error. Let's handle this by returning the
same error back to the caller.

Without this patch, building omap2plus_defconfig results in:

drivers/mtd/nand/omap2.c: In function 'omap_nand_probe':
drivers/mtd/nand/omap2.c:1154:6: warning: 'err' may be used uninitialized in this function [-Wuninitialized]

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Cc: Grazvydas Ignotas <notasas@gmail.com>

parent 38eaed32

drivers/mtd/nand/omap2.c

+3 −4

Original line number	Diff line number	Diff line
		@@ -1245,7 +1245,6 @@ static int __devinit omap_nand_probe(struct platform_device *pdev)
		goto out_release_mem_region;
		} else {
		struct dma_slave_config cfg;
		int rc;

		memset(&cfg, 0, sizeof(cfg));
		cfg.src_addr = info->phys_base;
		@@ -1254,10 +1253,10 @@ static int __devinit omap_nand_probe(struct platform_device *pdev)
		cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
		cfg.src_maxburst = 16;
		cfg.dst_maxburst = 16;
		rc = dmaengine_slave_config(info->dma, &cfg);
		if (rc) {
		err = dmaengine_slave_config(info->dma, &cfg);
		if (err) {
		dev_err(&pdev->dev, "DMA engine slave config failed: %d\n",
		rc);
		err);
		goto out_release_mem_region;
		}
		info->nand.read_buf = omap_read_buf_dma_pref;