FIX: fat: Provide correct return code from disk_{read|write} to upper layers
It is very common that FAT code is using following pattern:
if (disk_{read|write}() < 0)
return -1;
Up till now the above code was dead, since disk_{read|write) could only
return value >= 0.
As a result some errors from medium layer (i.e. eMMC/SD) were not caught.
The above behavior was caused by block_{read|write|erase} declared at
struct block_dev_desc (@part.h). It returns unsigned long, where 0
indicates error and > 0 indicates that medium operation was correct.
This patch as error regards 0 returned from block_{read|write|erase}
when nr_blocks is grater than zero. Read/Write operation with nr_blocks=0
should return 0 and hence is not considered as an error.
Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Test HW: Odroid XU3 - Exynos 5433
diff --git a/fs/fat/fat.c b/fs/fat/fat.c
index 06dcbb7..f939bc5 100644
--- a/fs/fat/fat.c
+++ b/fs/fat/fat.c
@@ -46,11 +46,18 @@
static int disk_read(__u32 block, __u32 nr_blocks, void *buf)
{
+ ulong ret;
+
if (!cur_dev || !cur_dev->block_read)
return -1;
- return cur_dev->block_read(cur_dev->dev,
- cur_part_info.start + block, nr_blocks, buf);
+ ret = cur_dev->block_read(cur_dev->dev,
+ cur_part_info.start + block, nr_blocks, buf);
+
+ if (nr_blocks && ret == 0)
+ return -1;
+
+ return ret;
}
int fat_set_blk_dev(block_dev_desc_t *dev_desc, disk_partition_t *info)