diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2012-03-07 20:10:04 (GMT) |
|---|---|---|
| committer | Scott Wood <scottwood@freescale.com> | 2014-05-14 18:38:38 (GMT) |
| commit | 9ecbfc1c07939f26cb8fcbacf615f82372d0762f (patch) | |
| tree | 953edb49f196255bf842ba1bf85c59670871f558 /net | |
| parent | 587c55f3b7e91d6b5059b6276b3c9c6789e514be (diff) | |
| download | linux-fsl-qoriq-9ecbfc1c07939f26cb8fcbacf615f82372d0762f.tar.xz | |
net: Use cpu_chill() instead of cpu_relax()
Retry loops on RT might loop forever when the modifying side was
preempted. Use cpu_chill() instead of cpu_relax() to let the system
make progress.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable-rt@vger.kernel.org
Diffstat (limited to 'net')
| -rw-r--r-- | net/packet/af_packet.c | 5 | ||||
| -rw-r--r-- | net/rds/ib_rdma.c | 3 |
2 files changed, 5 insertions, 3 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index 88cfbc1..d1705d0 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -63,6 +63,7 @@ #include <linux/if_packet.h> #include <linux/wireless.h> #include <linux/kernel.h> +#include <linux/delay.h> #include <linux/kmod.h> #include <linux/slab.h> #include <linux/vmalloc.h> @@ -630,7 +631,7 @@ static void prb_retire_rx_blk_timer_expired(unsigned long data) if (BLOCK_NUM_PKTS(pbd)) { while (atomic_read(&pkc->blk_fill_in_prog)) { /* Waiting for skb_copy_bits to finish... */ - cpu_relax(); + cpu_chill(); } } @@ -881,7 +882,7 @@ static void prb_retire_current_block(struct tpacket_kbdq_core *pkc, if (!(status & TP_STATUS_BLK_TMO)) { while (atomic_read(&pkc->blk_fill_in_prog)) { /* Waiting for skb_copy_bits to finish... */ - cpu_relax(); + cpu_chill(); } } prb_close_block(pkc, pbd, po, status); diff --git a/net/rds/ib_rdma.c b/net/rds/ib_rdma.c index e8fdb17..5a44c6e 100644 --- a/net/rds/ib_rdma.c +++ b/net/rds/ib_rdma.c @@ -34,6 +34,7 @@ #include <linux/slab.h> #include <linux/rculist.h> #include <linux/llist.h> +#include <linux/delay.h> #include "rds.h" #include "ib.h" @@ -286,7 +287,7 @@ static inline void wait_clean_list_grace(void) for_each_online_cpu(cpu) { flag = &per_cpu(clean_list_grace, cpu); while (test_bit(CLEAN_LIST_BUSY_BIT, flag)) - cpu_relax(); + cpu_chill(); } } |