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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>
This commit is contained in:
Thomas Gleixner 2012-03-07 21:10:04 +01:00 committed by Alibek Omarov
parent 15387f991a
commit 2cac4318fb
1 changed files with 3 additions and 2 deletions
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5
net/packet/af_packet.c
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@ -57,6 +57,7 @@
#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>
@ -660,7 +661,7 @@ static void prb_retire_rx_blk_timer_expired(struct timer_list *t)
if (BLOCK_NUM_PKTS(pbd)) {
while (atomic_read(&pkc->blk_fill_in_prog)) {
/* Waiting for skb_copy_bits to finish... */
cpu_relax();
cpu_chill();
}
}
@ -922,7 +923,7 @@ 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);