summaryrefslogtreecommitdiffstats
path: root/drivers/mtd
diff options
context:
space:
mode:
authorAlexander Shiyan <shc_work@mail.ru>2013-11-13 15:59:25 +0400
committerBrian Norris <computersforpeace@gmail.com>2014-01-03 11:22:19 -0800
commit4f0614a020524547d46e85ae5327f531e33cdf47 (patch)
tree5a7879b5bb859064889927bb04f28cd1f01ba8ef /drivers/mtd
parent3cb2c1ed4abe19d2881f74aa60c1a5b44524b2d0 (diff)
downloadlinux-4f0614a020524547d46e85ae5327f531e33cdf47.tar.bz2
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 <shc_work@mail.ru> Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/nand/diskonchip.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/mtd/nand/diskonchip.c b/drivers/mtd/nand/diskonchip.c
index b68a4959f700..0afafa049ea1 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);
}
}