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Commit 21dba244 authored by Tejun Heo's avatar Tejun Heo Committed by Jeff Garzik
Browse files

libata: clear PIO pad area 



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: default avatarTejun Heo <tj@kernel.org>
Cc: Lei Ming <tom.leiming@gmail.com>
Signed-off-by: default avatarJeff Garzik <jgarzik@redhat.com>
parent d8661921

drivers/ata/libata-sff.c

+2 −2
Original line number Diff line number Diff line
@@ -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;