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parport: parport_pc: Implement architecture and device check to cut off false-positives

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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>
This commit is contained in:
Matwey V. Kornilov 2014-08-27 12:07:44 +04:00 committed by Greg Kroah-Hartman
parent 17891c8a9e
commit 0ae39cc981
1 changed files with 17 additions and 1 deletions
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18
drivers/parport/parport_pc.c
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@ -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)
{