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authorMatwey V. Kornilov <matwey@sai.msu.ru>2014-08-27 12:07:44 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-09-23 23:14:28 -0700
commit0ae39cc98192252f756f8943be85e9f4dbd8436e (patch)
treee5bb7427279fb82886d7a0e7a4da43a7b9dd7bf9 /drivers/parport
parent17891c8a9ea17a11b437c7184f7f04e0ab7be811 (diff)
parport: parport_pc: Implement architecture and device check to cut off false-positives
We definitely know that only x86 (32-bit) architecture is affected by the issue, so implement a stub instead of the actual check for other architectures. We also know that motherboard LPT chipset is affected, so the port is either come from parport_pc_init (when `io' module param is used) or parport_pc_find_isa_ports (when default LPT ports are probbed: 0x378, 0x278, 0x3bc). In both cases the port considered as 'legacy' and `dev' member of struct parport is NULL. See also comments for `struct parport' in parport.h Signed-off-by: Matwey V. Kornilov <matwey@sai.msu.ru> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/parport')
-rw-r--r--drivers/parport/parport_pc.c18
1 files changed, 17 insertions, 1 deletions
diff --git a/drivers/parport/parport_pc.c b/drivers/parport/parport_pc.c
index fedc06bed18d..f721299eb1ba 100644
--- a/drivers/parport/parport_pc.c
+++ b/drivers/parport/parport_pc.c
@@ -1702,7 +1702,8 @@ static int parport_ECP_supported(struct parport *pb)
}
#endif
-static int intel_bug_present(struct parport *pb)
+#ifdef CONFIG_X86_32
+static int intel_bug_present_check_epp(struct parport *pb)
{
const struct parport_pc_private *priv = pb->private_data;
int bug_present = 0;
@@ -1725,6 +1726,21 @@ static int intel_bug_present(struct parport *pb)
return bug_present;
}
+static int intel_bug_present(struct parport *pb)
+{
+/* Check whether the device is legacy, not PCI or PCMCIA. Only legacy is known to be affected. */
+ if (pb->dev != NULL) {
+ return 0;
+ }
+
+ return intel_bug_present_check_epp(pb);
+}
+#else
+static int intel_bug_present(struct parport *pb)
+{
+ return 0;
+}
+#endif /* CONFIG_X86_32 */
static int parport_ECPPS2_supported(struct parport *pb)
{

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