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: Tejun Heo <tj@kernel.org> Cc: Lei Ming <tom.leiming@gmail.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
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@ -569,7 +569,7 @@ unsigned int ata_sff_data_xfer(struct ata_device *dev, unsigned char *buf,
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/* Transfer trailing byte, if any. */
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if (unlikely(buflen & 0x01)) {
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unsigned char pad[2];
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unsigned char pad[2] = { };
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/* Point buf to the tail of buffer */
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buf += buflen - 1;
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@ -628,7 +628,7 @@ unsigned int ata_sff_data_xfer32(struct ata_device *dev, unsigned char *buf,
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/* Transfer trailing bytes, if any */
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if (unlikely(slop)) {
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unsigned char pad[4];
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unsigned char pad[4] = { };
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/* Point buf to the tail of buffer */
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buf += buflen - slop;
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