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[S2IO]: Fixed memory leak when MSI-X vector allocation fails

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- Fixed memory leak by freeing MSI-X local entry memories when vector allocation
fails in s2io_add_isr.
- Added two utility functions remove_msix_isr and remove_inta_isr to eliminate
code duplication.
- Incorporated following review comments from Jeff
        - Removed redundant stats->mem_freed and synchronize_irq call
        - do_rem_msix_isr is renamed as remove_msix_isr
        - do_rem_inta_isr is renamed as remove_inta_isr

Signed-off-by: Sreenivasa Honnur <sreenivasa.honnur@neterion.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sreenivasa Honnur 2007-11-14 01:41:06 -08:00 committed by David S. Miller
parent 8cbdeec637
commit 18b2b7bd09
1 changed files with 51 additions and 59 deletions
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110
drivers/net/s2io.c
View file

@ -84,7 +84,7 @@
#include "s2io.h"
#include "s2io-regs.h"
#define DRV_VERSION "2.0.26.5"
#define DRV_VERSION "2.0.26.6"
/* S2io Driver name & version. */
static char s2io_driver_name[] = "Neterion";
@ -3775,6 +3775,40 @@ static int __devinit s2io_test_msi(struct s2io_nic *sp)
return err;
}
static void remove_msix_isr(struct s2io_nic *sp)
{
int i;
u16 msi_control;
for (i = 0; i < MAX_REQUESTED_MSI_X; i++) {
if (sp->s2io_entries[i].in_use ==
MSIX_REGISTERED_SUCCESS) {
int vector = sp->entries[i].vector;
void *arg = sp->s2io_entries[i].arg;
free_irq(vector, arg);
}
}
kfree(sp->entries);
kfree(sp->s2io_entries);
sp->entries = NULL;
sp->s2io_entries = NULL;
pci_read_config_word(sp->pdev, 0x42, &msi_control);
msi_control &= 0xFFFE; /* Disable MSI */
pci_write_config_word(sp->pdev, 0x42, msi_control);
pci_disable_msix(sp->pdev);
}
static void remove_inta_isr(struct s2io_nic *sp)
{
struct net_device *dev = sp->dev;
free_irq(sp->pdev->irq, dev);
}
/* ********************************************************* *
* Functions defined below concern the OS part of the driver *
* ********************************************************* */
@ -3809,28 +3843,9 @@ static int s2io_open(struct net_device *dev)
int ret = s2io_enable_msi_x(sp);
if (!ret) {
u16 msi_control;
ret = s2io_test_msi(sp);
/* rollback MSI-X, will re-enable during add_isr() */
kfree(sp->entries);
sp->mac_control.stats_info->sw_stat.mem_freed +=
(MAX_REQUESTED_MSI_X *
sizeof(struct msix_entry));
kfree(sp->s2io_entries);
sp->mac_control.stats_info->sw_stat.mem_freed +=
(MAX_REQUESTED_MSI_X *
sizeof(struct s2io_msix_entry));
sp->entries = NULL;
sp->s2io_entries = NULL;
pci_read_config_word(sp->pdev, 0x42, &msi_control);
msi_control &= 0xFFFE; /* Disable MSI */
pci_write_config_word(sp->pdev, 0x42, msi_control);
pci_disable_msix(sp->pdev);
remove_msix_isr(sp);
}
if (ret) {
@ -6719,15 +6734,22 @@ static int s2io_add_isr(struct s2io_nic * sp)
}
}
if (err) {
remove_msix_isr(sp);
DBG_PRINT(ERR_DBG,"%s:MSI-X-%d registration "
"failed\n", dev->name, i);
DBG_PRINT(ERR_DBG, "Returned: %d\n", err);
return -1;
DBG_PRINT(ERR_DBG, "%s: defaulting to INTA\n",
dev->name);
sp->config.intr_type = INTA;
break;
}
sp->s2io_entries[i].in_use = MSIX_REGISTERED_SUCCESS;
}
printk("MSI-X-TX %d entries enabled\n",msix_tx_cnt);
printk("MSI-X-RX %d entries enabled\n",msix_rx_cnt);
if (!err) {
printk(KERN_INFO "MSI-X-TX %d entries enabled\n",
msix_tx_cnt);
printk(KERN_INFO "MSI-X-RX %d entries enabled\n",
msix_rx_cnt);
}
}
if (sp->config.intr_type == INTA) {
err = request_irq((int) sp->pdev->irq, s2io_isr, IRQF_SHARED,
@ -6742,40 +6764,10 @@ static int s2io_add_isr(struct s2io_nic * sp)
}
static void s2io_rem_isr(struct s2io_nic * sp)
{
struct net_device *dev = sp->dev;
struct swStat *stats = &sp->mac_control.stats_info->sw_stat;
if (sp->config.intr_type == MSI_X) {
int i;
u16 msi_control;
for (i=1; (sp->s2io_entries[i].in_use ==
MSIX_REGISTERED_SUCCESS); i++) {
int vector = sp->entries[i].vector;
void *arg = sp->s2io_entries[i].arg;
synchronize_irq(vector);
free_irq(vector, arg);
}
kfree(sp->entries);
stats->mem_freed +=
(MAX_REQUESTED_MSI_X * sizeof(struct msix_entry));
kfree(sp->s2io_entries);
stats->mem_freed +=
(MAX_REQUESTED_MSI_X * sizeof(struct s2io_msix_entry));
sp->entries = NULL;
sp->s2io_entries = NULL;
pci_read_config_word(sp->pdev, 0x42, &msi_control);
msi_control &= 0xFFFE; /* Disable MSI */
pci_write_config_word(sp->pdev, 0x42, msi_control);
pci_disable_msix(sp->pdev);
} else {
synchronize_irq(sp->pdev->irq);
free_irq(sp->pdev->irq, dev);
}
if (sp->config.intr_type == MSI_X)
remove_msix_isr(sp);
else
remove_inta_isr(sp);
}
static void do_s2io_card_down(struct s2io_nic * sp, int do_io)