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fs: fat: don't call disk_write with zero sector num

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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>
This commit is contained in:
Wu, Josh 2013-07-24 17:55:30 +08:00 committed by Tom Rini
parent 7ea50d5284
commit 6b8f185faf
1 changed files with 5 additions and 3 deletions
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8
fs/fat/fat_write.c
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@ -552,9 +552,11 @@ 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) {