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libata: clear PIO pad area

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ata_sff_data_xfer[32]() use pad area if the transfer size isn't
multiple of transfer size; however, this area wasn't cleared and
garbage data in pad area could be transferred to the device.  Make
sure the pad area is cleared.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Lei Ming <tom.leiming@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Tejun Heo 2011-09-06 13:09:05 +09:00 committed by Jeff Garzik
parent d86619211e
commit 21dba24481
1 changed files with 2 additions and 2 deletions
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4
drivers/ata/libata-sff.c
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@ -569,7 +569,7 @@ unsigned int ata_sff_data_xfer(struct ata_device *dev, unsigned char *buf,
/* Transfer trailing byte, if any. */
if (unlikely(buflen & 0x01)) {
unsigned char pad[2];
unsigned char pad[2] = { };
/* Point buf to the tail of buffer */
buf += buflen - 1;
@ -628,7 +628,7 @@ unsigned int ata_sff_data_xfer32(struct ata_device *dev, unsigned char *buf,
/* Transfer trailing bytes, if any */
if (unlikely(slop)) {
unsigned char pad[4];
unsigned char pad[4] = { };
/* Point buf to the tail of buffer */
buf += buflen - slop;