The patch copies the flags masked by IORESOURCE_BITS from a resource's template. This is necessary because the resource settings require proper IORESOURCE_BITS which are not known during the definition of these resources using the "/sys/bus/pnp/*/*/resources" interface. (In fact, they should not be set by the user as the resource templates define the proper settings.)
If the patch is not applied, the resource flags are not initialized properly and obscure messages in the kernel log have been seen ("invalid flags"). The patch is applied against Linux 3.7 as well as linux-pm.git/master as of 2012-12-12. Signed-off-by: Witold Szczeponik <witold.szczepo...@gmx.net> Reviewed-by: Bjorn Helgaas <bhelg...@google.com> Index: linux/drivers/pnp/manager.c =================================================================== --- linux.orig/drivers/pnp/manager.c +++ linux/drivers/pnp/manager.c @@ -18,11 +18,27 @@ DEFINE_MUTEX(pnp_res_mutex); +static struct resource *pnp_find_resource(struct pnp_dev *dev, + unsigned char rule, + unsigned long type, + unsigned int bar) +{ + struct resource *res = pnp_get_resource(dev, type, bar); + + /* when the resource already exists, set its resource bits from rule */ + if (res) { + res->flags &= ~IORESOURCE_BITS; + res->flags |= rule & IORESOURCE_BITS; + } + + return res; +} + static int pnp_assign_port(struct pnp_dev *dev, struct pnp_port *rule, int idx) { struct resource *res, local_res; - res = pnp_get_resource(dev, IORESOURCE_IO, idx); + res = pnp_find_resource(dev, rule->flags, IORESOURCE_IO, idx); if (res) { pnp_dbg(&dev->dev, " io %d already set to %#llx-%#llx " "flags %#lx\n", idx, (unsigned long long) res->start, @@ -65,7 +81,7 @@ static int pnp_assign_mem(struct pnp_dev { struct resource *res, local_res; - res = pnp_get_resource(dev, IORESOURCE_MEM, idx); + res = pnp_find_resource(dev, rule->flags, IORESOURCE_MEM, idx); if (res) { pnp_dbg(&dev->dev, " mem %d already set to %#llx-%#llx " "flags %#lx\n", idx, (unsigned long long) res->start, @@ -78,6 +94,7 @@ static int pnp_assign_mem(struct pnp_dev res->start = 0; res->end = 0; + /* ??? rule->flags restricted to 8 bits, all tests bogus ??? */ if (!(rule->flags & IORESOURCE_MEM_WRITEABLE)) res->flags |= IORESOURCE_READONLY; if (rule->flags & IORESOURCE_MEM_CACHEABLE) @@ -123,7 +140,7 @@ static int pnp_assign_irq(struct pnp_dev 5, 10, 11, 12, 9, 14, 15, 7, 3, 4, 13, 0, 1, 6, 8, 2 }; - res = pnp_get_resource(dev, IORESOURCE_IRQ, idx); + res = pnp_find_resource(dev, rule->flags, IORESOURCE_IRQ, idx); if (res) { pnp_dbg(&dev->dev, " irq %d already set to %d flags %#lx\n", idx, (int) res->start, res->flags); @@ -182,7 +199,7 @@ static int pnp_assign_dma(struct pnp_dev 1, 3, 5, 6, 7, 0, 2, 4 }; - res = pnp_get_resource(dev, IORESOURCE_DMA, idx); + res = pnp_find_resource(dev, rule->flags, IORESOURCE_DMA, idx); if (res) { pnp_dbg(&dev->dev, " dma %d already set to %d flags %#lx\n", idx, (int) res->start, res->flags); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/