From: Joern Engel <joern@xxxxxxxxx>
Multiple nested loops. I have observed 590ms scheduler latency caused
by this loop and interrupts. Interrupts were responsible for 190ms, the
rest could have been avoided with a cond_resched.
Signed-off-by: Joern Engel <joern@xxxxxxxxx>
Signed-off-by: Spencer Baugh <sbaugh@xxxxxxxxxx>
---
drivers/pci/pcie/aer/aerdrv_core.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/pcie/aer/aerdrv_core.c b/drivers/pci/pcie/aer/aerdrv_core.c
index 9803e3d..32b1b5c 100644
--- a/drivers/pci/pcie/aer/aerdrv_core.c
+++ b/drivers/pci/pcie/aer/aerdrv_core.c
@@ -780,8 +780,10 @@ void aer_isr(struct work_struct *work)
struct aer_err_source uninitialized_var(e_src);
mutex_lock(&rpc->rpc_mutex);
- while (get_e_source(rpc, &e_src))
+ while (get_e_source(rpc, &e_src)) {
aer_isr_one_error(p_device, &e_src);
+ cond_resched();
+ }
mutex_unlock(&rpc->rpc_mutex);
wake_up(&rpc->wait_release);
--
2.5.0.rc3
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