From 4f0614a020524547d46e85ae5327f531e33cdf47 Mon Sep 17 00:00:00 2001 From: Alexander Shiyan Date: Wed, 13 Nov 2013 15:59:25 +0400 Subject: [PATCH] mtd: nand: diskonchip: Request memory region prior ioremap() This patch adds request_mem_region() prior ioremap() for diskonchip driver. This will allow to check if memory region is occupied by any other device, for example in case if we have memory region for several optional devices and only one device can be used at once. Signed-off-by: Alexander Shiyan Signed-off-by: Brian Norris --- drivers/mtd/nand/diskonchip.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/mtd/nand/diskonchip.c b/drivers/mtd/nand/diskonchip.c index b68a495..0afafa0 100644 --- a/drivers/mtd/nand/diskonchip.c +++ b/drivers/mtd/nand/diskonchip.c @@ -1440,10 +1440,13 @@ static int __init doc_probe(unsigned long physadr) int reg, len, numchips; int ret = 0; + if (!request_mem_region(physadr, DOC_IOREMAP_LEN, NULL)) + return -EBUSY; virtadr = ioremap(physadr, DOC_IOREMAP_LEN); if (!virtadr) { printk(KERN_ERR "Diskonchip ioremap failed: 0x%x bytes at 0x%lx\n", DOC_IOREMAP_LEN, physadr); - return -EIO; + ret = -EIO; + goto error_ioremap; } /* It's not possible to cleanly detect the DiskOnChip - the @@ -1629,6 +1632,10 @@ static int __init doc_probe(unsigned long physadr) WriteDOC(save_control, virtadr, DOCControl); fail: iounmap(virtadr); + +error_ioremap: + release_mem_region(physadr, DOC_IOREMAP_LEN); + return ret; } @@ -1645,6 +1652,7 @@ static void release_nanddoc(void) nextmtd = doc->nextdoc; nand_release(mtd); iounmap(doc->virtadr); + release_mem_region(doc->physadr, DOC_IOREMAP_LEN); kfree(mtd); } } -- 2.7.4