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authorHidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>2009-06-24 12:08:27 +0900
committerJesse Barnes <jbarnes@virtuousgeek.org>2009-06-29 12:10:10 -0700
commit0d07348931daef854aca8c834a89f1a99ba4ff2b (patch)
tree3cc936fd7f31d00ce9c452ac39ce772f628fccc3
parent2bfdd79eaa0043346e773ba5f6cfd811ea31b73d (diff)
PCI MSI: Return if alloc_msi_entry for MSI-X failed
In current code it continues setup even if alloc_msi_entry() for MSI-X is failed due to lack of memory. It means arch_setup_msi_irqs() might be called with msi_desc entries less than its argument nvec. At least x86's arch_setup_msi_irqs() uses list_for_each_entry() for dev->msi_list that suspected to have entries same numbers as nvec, and it doesn't check the number of allocated vectors and passed arg nvec. Therefore it will result in success of pci_enable_msix(), with less vectors allocated than requested. This patch fixes the error route to return -ENOMEM, instead of continuing the setup (proposed by Matthew Wilcox). Note that there is no iounmap in msi_free_irqs() if no msi_disc is allocated. Reviewed-by: Matthew Wilcox <matthew@wil.cx> Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
-rw-r--r--drivers/pci/msi.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index d9f06fbfa0b..628c14150d4 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -439,8 +439,14 @@ static int msix_capability_init(struct pci_dev *dev,
for (i = 0; i < nvec; i++) {
entry = alloc_msi_entry(dev);
- if (!entry)
- break;
+ if (!entry) {
+ if (!i)
+ iounmap(base);
+ else
+ msi_free_irqs(dev);
+ /* No enough memory. Don't try again */
+ return -ENOMEM;
+ }
j = entries[i].entry;
entry->msi_attrib.is_msix = 1;