diff options
| author | Jon Derrick <jonathan.derrick@intel.com> | 2016-09-14 10:38:55 -0600 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2016-09-27 14:30:36 -0500 |
| commit | 4b202b716e4e282c26c4a95952ea33e318c363ab (patch) | |
| tree | 672529777b3c47350a78ed1374dd3a8329737147 /drivers/pci/pcie | |
| parent | 2458d66b245e39786bc5b51062e6d30aa5ad0282 (diff) | |
| download | linux-4b202b716e4e282c26c4a95952ea33e318c363ab.tar.bz2 | |
PCI/AER: Avoid memory allocation in interrupt handling path
When handling AER events, we previously allocated a struct aer_err_info,
processed the error, and freed the struct. But aer_isr_one_error() is
serialized by rpc_mutex, so we never need more than one copy of the struct,
and the struct is only about 70 bytes, so we're not saving much by
allocating it dynamically.
Embed a struct aer_err_info directly in struct aer_rpc, which is allocated
at probe-time by aer_probe().
[bhelgaas: changelog]
Suggested-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Jon Derrick <jonathan.derrick@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'drivers/pci/pcie')
| -rw-r--r-- | drivers/pci/pcie/aer/aerdrv.h | 1 | ||||
| -rw-r--r-- | drivers/pci/pcie/aer/aerdrv_core.c | 13 |
2 files changed, 3 insertions, 11 deletions
diff --git a/drivers/pci/pcie/aer/aerdrv.h b/drivers/pci/pcie/aer/aerdrv.h index f15ca8dc3882..d51e4a57b190 100644 --- a/drivers/pci/pcie/aer/aerdrv.h +++ b/drivers/pci/pcie/aer/aerdrv.h @@ -60,6 +60,7 @@ struct aer_rpc { struct pcie_device *rpd; /* Root Port device */ struct work_struct dpc_handler; struct aer_err_source e_sources[AER_ERROR_SOURCES_MAX]; + struct aer_err_info e_info; unsigned short prod_idx; /* Error Producer Index */ unsigned short cons_idx; /* Error Consumer Index */ int isr; diff --git a/drivers/pci/pcie/aer/aerdrv_core.c b/drivers/pci/pcie/aer/aerdrv_core.c index 8262527e7fed..9fd18a08b23e 100644 --- a/drivers/pci/pcie/aer/aerdrv_core.c +++ b/drivers/pci/pcie/aer/aerdrv_core.c @@ -711,15 +711,8 @@ static inline void aer_process_err_devices(struct pcie_device *p_device, static void aer_isr_one_error(struct pcie_device *p_device, struct aer_err_source *e_src) { - struct aer_err_info *e_info; - - /* struct aer_err_info might be big, so we allocate it with slab */ - e_info = kmalloc(sizeof(struct aer_err_info), GFP_KERNEL); - if (!e_info) { - dev_printk(KERN_DEBUG, &p_device->port->dev, - "Can't allocate mem when processing AER errors\n"); - return; - } + struct aer_rpc *rpc = get_service_data(p_device); + struct aer_err_info *e_info = &rpc->e_info; /* * There is a possibility that both correctable error and @@ -758,8 +751,6 @@ static void aer_isr_one_error(struct pcie_device *p_device, if (find_source_device(p_device->port, e_info)) aer_process_err_devices(p_device, e_info); } - - kfree(e_info); } /** |