From d52c2d5a626a2cb1848fa7063b3ab79e2752dac7 Mon Sep 17 00:00:00 2001 From: Dave Johnson Date: Mon, 5 Mar 2007 20:50:27 -0500 Subject: [PATCH] [MIPS] Fix __raw_read_trylock() to allow multiple readers A deadlock can occur for mixed irq and non-irq rwlock readers if a 2nd reader attempts to take lock by looping around __raw_read_trylock(). Signed-off-by: Dave Johnson Signed-off-by: Ralf Baechle --- include/asm-mips/spinlock.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/include/asm-mips/spinlock.h b/include/asm-mips/spinlock.h index f1755d28a36a..35e431cd796b 100644 --- a/include/asm-mips/spinlock.h +++ b/include/asm-mips/spinlock.h @@ -287,7 +287,7 @@ static inline int __raw_read_trylock(raw_rwlock_t *rw) " .set noreorder # __raw_read_trylock \n" " li %2, 0 \n" "1: ll %1, %3 \n" - " bnez %1, 2f \n" + " bltz %1, 2f \n" " addu %1, 1 \n" " sc %1, %0 \n" " .set reorder \n" @@ -304,7 +304,7 @@ static inline int __raw_read_trylock(raw_rwlock_t *rw) " .set noreorder # __raw_read_trylock \n" " li %2, 0 \n" "1: ll %1, %3 \n" - " bnez %1, 2f \n" + " bltz %1, 2f \n" " addu %1, 1 \n" " sc %1, %0 \n" " beqz %1, 1b \n" -- 2.34.1