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authorRajesh Shah <rajesh.shah@intel.com>2006-05-23 10:14:36 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2006-06-21 12:00:00 -0700
commit020d502488bebdbc1b2c2828d996f04e563f082a (patch)
tree101cf0138612137dc08844dff137f927ed0a3b8b /drivers/pci
parent1edab4a164b229807853682f7ff7858c11dd3481 (diff)
[PATCH] PCI: Allow MSI to work on kexec kernel
We recently ran into a problem where the e1000 device failed to work properly on the kexec kernel. MSI was enabled for the device in the main kernel when it crashed. The e1000 driver tried to enable MSI on the kexec kernel, but the code bailed early when it found that MSI was already enabled in the hardware, even though the software state was not properly set up in the kexec'd kernel. This patch fixes the problem by moving the early return to after making sure that the software state is properly initialized. Signed-off-by: Rajesh Shah <rajesh.shah@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/msi.c7
1 files changed, 3 insertions, 4 deletions
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 4aea563bda6..9c69b6966e7 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -940,14 +940,13 @@ int pci_enable_msi(struct pci_dev* dev)
if (!pos)
return -EINVAL;
- pci_read_config_word(dev, msi_control_reg(pos), &control);
- if (control & PCI_MSI_FLAGS_ENABLE)
- return 0; /* Already in MSI mode */
-
if (!msi_lookup_vector(dev, PCI_CAP_ID_MSI)) {
/* Lookup Sucess */
unsigned long flags;
+ pci_read_config_word(dev, msi_control_reg(pos), &control);
+ if (control & PCI_MSI_FLAGS_ENABLE)
+ return 0; /* Already in MSI mode */
spin_lock_irqsave(&msi_lock, flags);
if (!vector_irq[dev->irq]) {
msi_desc[dev->irq]->msi_attrib.state = 0;