diff options
| author |   Brian Swetland <swetland@google.com> | 2009-12-07 15:28:08 -0800 |
|---|---|---|
| committer |   Daniel Walker <dwalker@codeaurora.org> | 2010-05-12 09:15:31 -0700 |
| commit | 636eb9cbaef7989ce7809a0d842bf78470a0a1f4 (patch) | |
| tree | 1a12088ad69cb37d5e3f3f25bdf03c7c9e8a7846 /arch/arm/mach-msm/smd.c | |
| parent | [ARM] msm: add /proc/last_radio_log when supported by the modem. (diff) | |
| download | linux-dev-636eb9cbaef7989ce7809a0d842bf78470a0a1f4.tar.xz linux-dev-636eb9cbaef7989ce7809a0d842bf78470a0a1f4.zip | |
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.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/arm/mach-msm/smd.c b/arch/arm/mach-msm/smd.c index 655fe42506ca..086fd77dc891 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); |