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Code Issues Releases Wiki Activity

PCI/MSI: Sanitize MSI-X table map handling

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Unmapping the MSI-X base mapping in the loops which allocate/free MSI
descriptors is daft and in the way of allowing runtime expansion of MSI-X
descriptors.

Store the mapping in struct pci_dev and free it after freeing the MSI-X
descriptors.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://lore.kernel.org/r/20211206210224.871651518@linutronix.de
This commit is contained in:
Thomas Gleixner 2021-12-06 23:27:54 +01:00
parent aa423ac422
commit 85aa607e79
2 changed files with 9 additions and 10 deletions
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18
drivers/pci/msi/msi.c
View file

@ -241,14 +241,14 @@ static void free_msi_irqs(struct pci_dev *dev)
pci_msi_teardown_msi_irqs(dev);
list_for_each_entry_safe(entry, tmp, msi_list, list) {
if (entry->pci.msi_attrib.is_msix) {
if (list_is_last(&entry->list, msi_list))
iounmap(entry->pci.mask_base);
}
list_del(&entry->list);
free_msi_entry(entry);
}
if (dev->msix_base) {
iounmap(dev->msix_base);
dev->msix_base = NULL;
}
}
static void pci_intx_for_msi(struct pci_dev *dev, int enable)
@ -501,10 +501,6 @@ static int msix_setup_entries(struct pci_dev *dev, void __iomem *base,
for (i = 0, curmsk = masks; i < nvec; i++) {
entry = alloc_msi_entry(&dev->dev, 1, curmsk);
if (!entry) {
if (!i)
iounmap(base);
else
free_msi_irqs(dev);
/* No enough memory. Don't try again */
ret = -ENOMEM;
goto out;
@ -602,12 +598,14 @@ static int msix_capability_init(struct pci_dev *dev, struct msix_entry *entries,
goto out_disable;
}
dev->msix_base = base;
/* Ensure that all table entries are masked. */
msix_mask_all(base, tsize);
ret = msix_setup_entries(dev, base, entries, nvec, affd);
if (ret)
goto out_disable;
goto out_free;
ret = pci_msi_setup_msi_irqs(dev, nvec, PCI_CAP_ID_MSIX);
if (ret)

1
include/linux/pci.h
View file

@ -473,6 +473,7 @@ struct pci_dev {
u8 ptm_granularity;
#endif
#ifdef CONFIG_PCI_MSI
void __iomem *msix_base;
const struct attribute_group **msi_irq_groups;
#endif
struct pci_vpd vpd;