[PATCH 4.4 36/74] ata: ahci: dont mark HotPlugCapable Ports as external/removable

Greg Kroah-Hartman
2016-03-08T00:16:14Z

From: Manuel Lauss <manuel.lauss@gmail.com>

commit dc8b4afc4a04fac8ee55a19b59f2356a25e7e778 upstream.

The HPCP bit is set by bioses for on-board sata ports either because
they think sata is hotplug capable in general or to allow Windows
to display a "device eject" icon on ports which are routed to an
external connector bracket.

However in Redhat Bugzilla #1310682, users report that with kernel 4.4,
where this bit test first appeared, a lot of partitions on sata drives
are now mounted automatically.

This patch should fix redhat and a lot of other distros which
unconditionally automount all devices which have the "removable"
bit set.

Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Fixes: 8a3e33cf92c7 ("ata: ahci: find eSATA ports and flag them as removable" changes userspace behavior)
Link: http://lkml.kernel.org/g/56CF35FA.1070500@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/ata/libahci.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -1142,8 +1142,7 @@ static void ahci_port_init(struct device

/* mark esata ports */
tmp = readl(port_mmio + PORT_CMD);
- if ((tmp & PORT_CMD_HPCP) ||
- ((tmp & PORT_CMD_ESP) && (hpriv->cap & HOST_CAP_SXS)))
+ if ((tmp & PORT_CMD_ESP) && (hpriv->cap & HOST_CAP_SXS))
ap->pflags |= ATA_PFLAG_EXTERNAL;
}