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Commit c893cd2e authored by Meng Wang's avatar Meng Wang
Browse files

dsp: lsm: add apr NULL check in apr deregister 



During SSR, q6lsm_mmapcallback could happen before
q6lsm_mmap_apr_dereg. q6lsm_common.apr and
q6lsm_common.apr_users are cleared in q6lsm_mmapcallback.
Add apr NULL check in q6lsm_mmap_apr_dereg before accessing
q6lsm_common.apr_users.

Change-Id: Ia0ff57b3fff0a0e4f26b836a8a15324406af1a14
Signed-off-by: default avatarMeng Wang <mengw@codeaurora.org>
parent 018a0615

dsp/q6lsm.c

+9 −6
Original line number Diff line number Diff line
@@ -285,12 +285,15 @@ static void *q6lsm_mmap_apr_reg(void) 


static int q6lsm_mmap_apr_dereg(void)

{

	if (lsm_common.apr) {

		if (atomic_read(&lsm_common.apr_users) <= 0) {

			WARN("%s: APR common port already closed\n", __func__);

		} else {

			if (atomic_dec_return(&lsm_common.apr_users) == 0) {

				apr_deregister(lsm_common.apr);

			pr_debug("%s: APR De-Register common port\n", __func__);

				pr_debug("%s: APR De-Register common port\n",

					__func__);

			}

		}

	}

	return 0;