Commit 1899c111 authored by Ben Hutchings's avatar Ben Hutchings

sfc: Fix IRQ cleanup in case of a probe failure

The lifetime of an irq_cpu_rmap is odd: we have to allocate it before
installing IRQ handlers and free it before removing the IRQ handlers.
As a result of this asymmetry, it was omitted from some failure paths.

On another failure path, we could try to remove IRQ handlers we
had not yet installed.

Move the irq_cpu_rmap allocation and freeing alongside IRQ handler
installation and removal, in efx_nic_{init,fini}_interrupts().
Count the number of IRQ handlers successfully installed and only
remove those on the failure path.
Signed-off-by: default avatarBen Hutchings <bhutchings@solarflare.com>
parent e79255de
......@@ -21,7 +21,6 @@
#include <linux/ethtool.h>
#include <linux/topology.h>
#include <linux/gfp.h>
#include <linux/cpu_rmap.h>
#include <linux/aer.h>
#include <linux/interrupt.h>
#include "net_driver.h"
......@@ -1284,29 +1283,6 @@ static unsigned int efx_wanted_parallelism(struct efx_nic *efx)
return count;
}
static int
efx_init_rx_cpu_rmap(struct efx_nic *efx, struct msix_entry *xentries)
{
#ifdef CONFIG_RFS_ACCEL
unsigned int i;
int rc;
efx->net_dev->rx_cpu_rmap = alloc_irq_cpu_rmap(efx->n_rx_channels);
if (!efx->net_dev->rx_cpu_rmap)
return -ENOMEM;
for (i = 0; i < efx->n_rx_channels; i++) {
rc = irq_cpu_rmap_add(efx->net_dev->rx_cpu_rmap,
xentries[i].vector);
if (rc) {
free_irq_cpu_rmap(efx->net_dev->rx_cpu_rmap);
efx->net_dev->rx_cpu_rmap = NULL;
return rc;
}
}
#endif
return 0;
}
/* Probe the number and type of interrupts we are able to obtain, and
* the resulting numbers of channels and RX queues.
*/
......@@ -1360,11 +1336,6 @@ static int efx_probe_interrupts(struct efx_nic *efx)
efx->n_tx_channels = n_channels;
efx->n_rx_channels = n_channels;
}
rc = efx_init_rx_cpu_rmap(efx, xentries);
if (rc) {
pci_disable_msix(efx->pci_dev);
return rc;
}
for (i = 0; i < efx->n_channels; i++)
efx_get_channel(efx, i)->irq =
xentries[i].vector;
......@@ -2608,10 +2579,6 @@ static void efx_pci_remove_main(struct efx_nic *efx)
BUG_ON(efx->state == STATE_READY);
cancel_work_sync(&efx->reset_work);
#ifdef CONFIG_RFS_ACCEL
free_irq_cpu_rmap(efx->net_dev->rx_cpu_rmap);
efx->net_dev->rx_cpu_rmap = NULL;
#endif
efx_stop_interrupts(efx, false);
efx_nic_fini_interrupt(efx);
efx_fini_port(efx);
......
......@@ -14,6 +14,7 @@
#include <linux/pci.h>
#include <linux/module.h>
#include <linux/seq_file.h>
#include <linux/cpu_rmap.h>
#include "net_driver.h"
#include "bitfield.h"
#include "efx.h"
......@@ -1706,6 +1707,7 @@ void efx_nic_push_rx_indir_table(struct efx_nic *efx)
int efx_nic_init_interrupt(struct efx_nic *efx)
{
struct efx_channel *channel;
unsigned int n_irqs;
int rc;
if (!EFX_INT_MODE_USE_MSI(efx)) {
......@@ -1726,7 +1728,19 @@ int efx_nic_init_interrupt(struct efx_nic *efx)
return 0;
}
#ifdef CONFIG_RFS_ACCEL
if (efx->interrupt_mode == EFX_INT_MODE_MSIX) {
efx->net_dev->rx_cpu_rmap =
alloc_irq_cpu_rmap(efx->n_rx_channels);
if (!efx->net_dev->rx_cpu_rmap) {
rc = -ENOMEM;
goto fail1;
}
}
#endif
/* Hook MSI or MSI-X interrupt */
n_irqs = 0;
efx_for_each_channel(channel, efx) {
rc = request_irq(channel->irq, efx_msi_interrupt,
IRQF_PROBE_SHARED, /* Not shared */
......@@ -1737,13 +1751,31 @@ int efx_nic_init_interrupt(struct efx_nic *efx)
"failed to hook IRQ %d\n", channel->irq);
goto fail2;
}
++n_irqs;
#ifdef CONFIG_RFS_ACCEL
if (efx->interrupt_mode == EFX_INT_MODE_MSIX &&
channel->channel < efx->n_rx_channels) {
rc = irq_cpu_rmap_add(efx->net_dev->rx_cpu_rmap,
channel->irq);
if (rc)
goto fail2;
}
#endif
}
return 0;
fail2:
efx_for_each_channel(channel, efx)
#ifdef CONFIG_RFS_ACCEL
free_irq_cpu_rmap(efx->net_dev->rx_cpu_rmap);
efx->net_dev->rx_cpu_rmap = NULL;
#endif
efx_for_each_channel(channel, efx) {
if (n_irqs-- == 0)
break;
free_irq(channel->irq, &efx->channel[channel->channel]);
}
fail1:
return rc;
}
......@@ -1753,11 +1785,14 @@ void efx_nic_fini_interrupt(struct efx_nic *efx)
struct efx_channel *channel;
efx_oword_t reg;
#ifdef CONFIG_RFS_ACCEL
free_irq_cpu_rmap(efx->net_dev->rx_cpu_rmap);
efx->net_dev->rx_cpu_rmap = NULL;
#endif
/* Disable MSI/MSI-X interrupts */
efx_for_each_channel(channel, efx) {
if (channel->irq)
efx_for_each_channel(channel, efx)
free_irq(channel->irq, &efx->channel[channel->channel]);
}
/* ACK legacy interrupt */
if (efx_nic_rev(efx) >= EFX_REV_FALCON_B0)
......
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