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authorBjorn Helgaas <bjorn.helgaas@hp.com>2007-05-08 00:35:54 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-08 11:15:23 -0700
commit8f81dd149806bc53c68c92f34d61f88427079039 (patch)
treeae60b9f2485a44d68b91aa18bf0991e6cf1181f1 /drivers/pnp/core.c
parentcab9bdd14dd7d8091b0aac7877ae9f29724eb741 (diff)
downloadlinux-linaro-stable-8f81dd149806bc53c68c92f34d61f88427079039.tar.gz
PNP: notice whether we have PNP devices (PNPBIOS or PNPACPI)
This series converts i386 and x86_64 legacy serial ports to be platform devices and prevents probing for them if we have PNP. This prevents double discovery, where a device was found both by the legacy probe and by 8250_pnp. This also prevents the serial driver from claiming IRDA devices (unless they have a UART PNP ID). The serial legacy probe sometimes assumed the wrong IRQ, so the user had to use "setserial" to fix it. Removing the need for setserial to make IRDA devices work seems good, but it does break some things. In particular, you may need to keep setserial from poking legacy UART stuff back in by doing something like "dpkg-reconfigure setserial" with the "kernel" option. Otherwise, the setserial-discovered "UART" will claim resources and prevent the IRDA driver from loading. This patch: If we can discover devices using PNP, we can skip some legacy probes. This flag ("pnp_platform_devices") indicates that PNPBIOS or PNPACPI is enabled and should tell us about builtin devices. Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Cc: Keith Owens <kaos@ocs.com.au> Cc: Len Brown <lenb@kernel.org> Cc: Adam Belay <ambx1@neo.rr.com> Cc: Matthieu CASTET <castet.matthieu@free.fr> Cc: Jean Tourrilhes <jt@hpl.hp.com> Cc: Matthew Garrett <mjg59@srcf.ucam.org> Cc: Ville Syrjala <syrjala@sci.fi> Cc: Russell King <rmk+serial@arm.linux.org.uk> Cc: Samuel Ortiz <samuel@sortiz.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/pnp/core.c')
-rw-r--r--drivers/pnp/core.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/pnp/core.c b/drivers/pnp/core.c
index d8d75541552c..3e20b1cc7778 100644
--- a/drivers/pnp/core.c
+++ b/drivers/pnp/core.c
@@ -23,6 +23,14 @@ static LIST_HEAD(pnp_protocols);
LIST_HEAD(pnp_global);
DEFINE_SPINLOCK(pnp_lock);
+/*
+ * ACPI or PNPBIOS should tell us about all platform devices, so we can
+ * skip some blind probes. ISAPNP typically enumerates only plug-in ISA
+ * devices, not built-in things like COM ports.
+ */
+int pnp_platform_devices;
+EXPORT_SYMBOL(pnp_platform_devices);
+
void *pnp_alloc(long size)
{
void *result;