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authorChristoph Hellwig <hch@lst.de>2017-08-29 15:42:06 +0300
committerTejun Heo <tj@kernel.org>2017-08-29 18:33:24 +0300
commite8f11db956aa09c1618051a7aaf367d6810d8d8c (patch)
treeb4d766f6031e5a231cee41d0f33225ce45a7a009 /drivers/ata
parent35f0b6a779b8b7a98faefd7c1c660b4dac9a5c26 (diff)
downloadlinux-e8f11db956aa09c1618051a7aaf367d6810d8d8c.tar.xz
libata: check for trusted computing in IDENTIFY DEVICE data
ATA-8 and later mirrors the TRUSTED COMPUTING SUPPORTED bit in word 48 of the IDENTIFY DEVICE data. Check this before issuing a READ LOG PAGE command to avoid issues with buggy devices. The only downside is that we can't support Security Send / Receive for a device with an older revision due to the conflicting use of this field in earlier specifications. tj: The reason we need this is because some devices which don't support READ LOG PAGE lock up after getting issued that command. Signed-off-by: Christoph Hellwig <hch@lst.de> Tested-by: David Ahern <dsahern@gmail.com> Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'drivers/ata')
-rw-r--r--drivers/ata/libata-core.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 697f5f896b19..ca57b03ab950 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -2413,6 +2413,9 @@ static void ata_dev_config_trusted(struct ata_device *dev)
u64 trusted_cap;
unsigned int err;
+ if (!ata_id_has_trusted(dev->id))
+ return;
+
if (!ata_identify_page_supported(dev, ATA_LOG_SECURITY)) {
ata_dev_warn(dev,
"Security Log not supported\n");