Re: avoiding pci_disable_device()...

[Roland Dreier <roland@topspin.com>]

OK, I'm happy to go along with that (it definitely simplifies my
driver code).  Here's the patch.


Remove the call to request_mem_region() in msix_capability_init() to
grab the MSI-X vector table.  Drivers should be using
pci_request_regions() so that they own all of the PCI BARs, and the
MSI-X core should trust it's being called by a correct driver.

Signed-off-by: Roland Dreier <roland@topspin.com>

--- linux-orig/drivers/pci/msi.c	(revision 26881)
+++ linux/drivers/pci/msi.c	(working copy)
@@ -616,15 +616,10 @@ static int msix_capability_init(struct p
 	bir = (u8)(table_offset & PCI_MSIX_FLAGS_BIRMASK);
 	phys_addr = pci_resource_start (dev, bir);
 	phys_addr += (u32)(table_offset & ~PCI_MSIX_FLAGS_BIRMASK);
-	if (!request_mem_region(phys_addr,
-		nr_entries * PCI_MSIX_ENTRY_SIZE,
-		"MSI-X vector table"))
-		return -ENOMEM;
 	base = ioremap_nocache(phys_addr, nr_entries * PCI_MSIX_ENTRY_SIZE);
-	if (base == NULL) {
-		release_mem_region(phys_addr, nr_entries * PCI_MSIX_ENTRY_SIZE);
+	if (base == NULL)
 		return -ENOMEM;
-	}
+
 	/* MSI-X Table Initialization */
 	for (i = 0; i < nvec; i++) {
 		entry = alloc_msi_entry();
@@ -859,8 +854,6 @@ static int msi_free_vector(struct pci_de
 			phys_addr += (u32)(table_offset &
 				~PCI_MSIX_FLAGS_BIRMASK);
 			iounmap(base);
-			release_mem_region(phys_addr,
-				nr_entries * PCI_MSIX_ENTRY_SIZE);
 		}
 	}
 
@@ -1133,8 +1126,6 @@ void msi_remove_pci_irq_vectors(struct p
 			phys_addr += (u32)(table_offset &
 				~PCI_MSIX_FLAGS_BIRMASK);
 			iounmap(base);
-			release_mem_region(phys_addr, PCI_MSIX_ENTRY_SIZE *
-				multi_msix_capable(control));
 			printk(KERN_WARNING "PCI: %s: msi_remove_pci_irq_vectors() "
 			       "called without free_irq() on all MSI-X vectors\n",
 			       pci_name(dev));