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| author | Matwey V. Kornilov <matwey@sai.msu.ru> | 2014-08-27 12:07:44 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-09-23 23:14:28 -0700 |
| commit | 0ae39cc98192252f756f8943be85e9f4dbd8436e (patch) | |
| tree | e5bb7427279fb82886d7a0e7a4da43a7b9dd7bf9 /drivers/parport | |
| parent | 17891c8a9ea17a11b437c7184f7f04e0ab7be811 (diff) | |
| download | linux-rt-0ae39cc98192252f756f8943be85e9f4dbd8436e.tar.gz | |
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.c | 18 |
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) { |