In the set_cluster() function, it will convert the buffer size to sector numbers. Then call disk_write() to write by sector. For remaining buffer, the size is less than a sector, call disk_write() again to write them in one sector.
But if the total buffer size is less then one sector, the original code will call disk_write() with zero sector number. It is unnecessary. So this patch fix this. Now it will not call disk_write() if total buffer size is less than one sector.
Signed-off-by: Josh Wu josh.wu@atmel.com --- fs/fat/fat_write.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/fs/fat/fat_write.c b/fs/fat/fat_write.c index fd07240..a05327c 100644 --- a/fs/fat/fat_write.c +++ b/fs/fat/fat_write.c @@ -568,9 +568,11 @@ set_cluster(fsdata *mydata, __u32 clustnum, __u8 *buffer,
debug("clustnum: %d, startsect: %d\n", clustnum, startsect);
- if (disk_write(startsect, size / mydata->sect_size, buffer) < 0) { - debug("Error writing data\n"); - return -1; + if ((size / mydata->sect_size) > 0) { + if (disk_write(startsect, size / mydata->sect_size, buffer) < 0) { + debug("Error writing data\n"); + return -1; + } }
if (size % mydata->sect_size) {