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path: root/drivers/pci/msi.c
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Diffstat (limited to 'drivers/pci/msi.c')
-rw-r--r--drivers/pci/msi.c96
1 files changed, 39 insertions, 57 deletions
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 955ab7990c5b..27a7e67ddfe4 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -10,7 +10,6 @@
#include <linux/mm.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
-#include <linux/init.h>
#include <linux/export.h>
#include <linux/ioport.h>
#include <linux/pci.h>
@@ -544,22 +543,18 @@ static int populate_msi_sysfs(struct pci_dev *pdev)
if (!msi_attrs)
return -ENOMEM;
list_for_each_entry(entry, &pdev->msi_list, list) {
- char *name = kmalloc(20, GFP_KERNEL);
- if (!name)
- goto error_attrs;
-
msi_dev_attr = kzalloc(sizeof(*msi_dev_attr), GFP_KERNEL);
- if (!msi_dev_attr) {
- kfree(name);
+ if (!msi_dev_attr)
goto error_attrs;
- }
+ msi_attrs[count] = &msi_dev_attr->attr;
- sprintf(name, "%d", entry->irq);
sysfs_attr_init(&msi_dev_attr->attr);
- msi_dev_attr->attr.name = name;
+ msi_dev_attr->attr.name = kasprintf(GFP_KERNEL, "%d",
+ entry->irq);
+ if (!msi_dev_attr->attr.name)
+ goto error_attrs;
msi_dev_attr->attr.mode = S_IRUGO;
msi_dev_attr->show = msi_mode_show;
- msi_attrs[count] = &msi_dev_attr->attr;
++count;
}
@@ -883,50 +878,6 @@ int pci_msi_vec_count(struct pci_dev *dev)
}
EXPORT_SYMBOL(pci_msi_vec_count);
-/**
- * pci_enable_msi_block - configure device's MSI capability structure
- * @dev: device to configure
- * @nvec: number of interrupts to configure
- *
- * Allocate IRQs for a device with the MSI capability.
- * This function returns a negative errno if an error occurs. If it
- * is unable to allocate the number of interrupts requested, it returns
- * the number of interrupts it might be able to allocate. If it successfully
- * allocates at least the number of interrupts requested, it returns 0 and
- * updates the @dev's irq member to the lowest new interrupt number; the
- * other interrupt numbers allocated to this device are consecutive.
- */
-int pci_enable_msi_block(struct pci_dev *dev, int nvec)
-{
- int status, maxvec;
-
- if (dev->current_state != PCI_D0)
- return -EINVAL;
-
- maxvec = pci_msi_vec_count(dev);
- if (maxvec < 0)
- return maxvec;
- if (nvec > maxvec)
- return maxvec;
-
- status = pci_msi_check_device(dev, nvec, PCI_CAP_ID_MSI);
- if (status)
- return status;
-
- WARN_ON(!!dev->msi_enabled);
-
- /* Check whether driver already requested MSI-X irqs */
- if (dev->msix_enabled) {
- dev_info(&dev->dev, "can't enable MSI "
- "(MSI-X already enabled)\n");
- return -EINVAL;
- }
-
- status = msi_capability_init(dev, nvec);
- return status;
-}
-EXPORT_SYMBOL(pci_enable_msi_block);
-
void pci_msi_shutdown(struct pci_dev *dev)
{
struct msi_desc *desc;
@@ -1132,14 +1083,45 @@ void pci_msi_init_pci_dev(struct pci_dev *dev)
**/
int pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec)
{
- int nvec = maxvec;
+ int nvec;
int rc;
+ if (dev->current_state != PCI_D0)
+ return -EINVAL;
+
+ WARN_ON(!!dev->msi_enabled);
+
+ /* Check whether driver already requested MSI-X irqs */
+ if (dev->msix_enabled) {
+ dev_info(&dev->dev,
+ "can't enable MSI (MSI-X already enabled)\n");
+ return -EINVAL;
+ }
+
if (maxvec < minvec)
return -ERANGE;
+ nvec = pci_msi_vec_count(dev);
+ if (nvec < 0)
+ return nvec;
+ else if (nvec < minvec)
+ return -EINVAL;
+ else if (nvec > maxvec)
+ nvec = maxvec;
+
+ do {
+ rc = pci_msi_check_device(dev, nvec, PCI_CAP_ID_MSI);
+ if (rc < 0) {
+ return rc;
+ } else if (rc > 0) {
+ if (rc < minvec)
+ return -ENOSPC;
+ nvec = rc;
+ }
+ } while (rc);
+
do {
- rc = pci_enable_msi_block(dev, nvec);
+ rc = msi_capability_init(dev, nvec);
if (rc < 0) {
return rc;
} else if (rc > 0) {