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authorBrian Swetland <swetland@google.com>2009-12-07 15:28:08 -0800
committerDaniel Walker <dwalker@codeaurora.org>2010-05-12 09:15:31 -0700
commit636eb9cbaef7989ce7809a0d842bf78470a0a1f4 (patch)
tree1a12088ad69cb37d5e3f3f25bdf03c7c9e8a7846 /arch/arm/mach-msm/smd.c
parent1207babdcdfe5501d1528c86b445a9d1045ecc01 (diff)
downloadop-kernel-dev-636eb9cbaef7989ce7809a0d842bf78470a0a1f4.zip
op-kernel-dev-636eb9cbaef7989ce7809a0d842bf78470a0a1f4.tar.gz
msm: smd: provide atomic channel writes
Some smd clients may write from multiple threads, in which case it's not safe to call smd_write without holding a lock. smd_write_atomic() provides the same functionality as smd_write() but obtains the smd lock first. Signed-off-by: Brian Swetland <swetland@google.com> Signed-off-by: Daniel Walker <dwalker@codeaurora.org>
Diffstat (limited to 'arch/arm/mach-msm/smd.c')
-rw-r--r--arch/arm/mach-msm/smd.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/arm/mach-msm/smd.c b/arch/arm/mach-msm/smd.c
index 655fe42..086fd77 100644
--- a/arch/arm/mach-msm/smd.c
+++ b/arch/arm/mach-msm/smd.c
@@ -804,6 +804,16 @@ int smd_write(smd_channel_t *ch, const void *data, int len)
return ch->write(ch, data, len);
}
+int smd_write_atomic(smd_channel_t *ch, const void *data, int len)
+{
+ unsigned long flags;
+ int res;
+ spin_lock_irqsave(&smd_lock, flags);
+ res = ch->write(ch, data, len);
+ spin_unlock_irqrestore(&smd_lock, flags);
+ return res;
+}
+
int smd_read_avail(smd_channel_t *ch)
{
return ch->read_avail(ch);
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