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spcom: open channel return EBUSY when channel in use

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The char device /dev/sp_kernel is used for loading SP application and
creating new channel char device, therefore might be temporary busy.
Return EBUSY error to user system call open() so it can retry.

Change-Id: I230577fe6b03ac7afd7175f72f9a3fa80db5a524
Signed-off-by: Amir Samuelov <amirs@codeaurora.org>
This commit is contained in:
Amir Samuelov 2017-05-28 16:11:37 +03:00 • committed by Gerrit - the friendly Code Review server
parent ace73576d2
commit d23cacb3ac
1 changed files with 4 additions and 2 deletions
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6
drivers/soc/qcom/spcom.c
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@ -718,8 +718,10 @@ static int spcom_open(struct spcom_channel *ch, unsigned int timeout_msec)
/* only one client/server may use the channel */ /* only one client/server may use the channel */
if (ch->ref_count) { if (ch->ref_count) {
pr_err("channel [%s] already in use.\n", name); pr_err("channel [%s] is BUSY, already in use by pid [%d].\n",
goto exit_err; name, ch->pid);
mutex_unlock(&ch->lock);
return -EBUSY;
} }
pr_debug("ch [%s] opened by PID [%d], count [%d]\n", pr_debug("ch [%s] opened by PID [%d], count [%d]\n",