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scsi: libsas: align sata_device's rps_resp on a cacheline
commitc2e8fbf908
upstream. The rps_resp buffer in ata_device is a DMA target, but it isn't explicitly cacheline aligned. Due to this, adjacent fields can be overwritten with stale data from memory on non-coherent architectures. As a result, the kernel is sometimes unable to communicate with an SATA device behind a SAS expander. Fix this by ensuring that the rps_resp buffer is cacheline aligned. This issue is similar to that fixed by Commit84bda12af3
("libata: align ap->sector_buf") and Commit4ee34ea3a1
("libata: Align ata_device's id on a cacheline"). Signed-off-by: Huacai Chen <chenhc@lemote.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -165,11 +165,11 @@ struct expander_device {
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struct sata_device {
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unsigned int class;
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struct smp_resp rps_resp; /* report_phy_sata_resp */
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u8 port_no; /* port number, if this is a PM (Port) */
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struct ata_port *ap;
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struct ata_host ata_host;
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struct smp_resp rps_resp ____cacheline_aligned; /* report_phy_sata_resp */
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u8 fis[ATA_RESP_FIS_SIZE];
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};
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