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Commit 1c624689 authored by Bojun Pan's avatar Bojun Pan
Browse files

msm: gsi: gsi channel mode switch spinlock fix 



Fix the spin lock issue which will cause the race condition
that gsi_isr will still happen even we are in polling mode.

Change-Id: I940b5e45bbfcdc25bcde943b8a6fb523a7e995bb
Signed-off-by: default avatarBojun Pan <bojunp@codeaurora.org>
parent eddc683b

drivers/platform/msm/gsi/gsi.c

+8 −2
Original line number Diff line number Diff line
@@ -2787,21 +2787,27 @@ int gsi_config_channel_mode(unsigned long chan_hdl, enum gsi_chan_mode mode) 
		return -GSI_STATUS_UNSUPPORTED_OP;

	}



	spin_lock_irqsave(&gsi_ctx->slock, flags);

	if (curr == GSI_CHAN_MODE_CALLBACK &&

			mode == GSI_CHAN_MODE_POLL) {

		spin_lock_irqsave(&gsi_ctx->slock, flags);

		__gsi_config_ieob_irq(gsi_ctx->per.ee, 1 << ctx->evtr->id, 0);

		spin_unlock_irqrestore(&gsi_ctx->slock, flags);

		spin_lock_irqsave(&ctx->ring.slock, flags);

		atomic_set(&ctx->poll_mode, mode);

		spin_unlock_irqrestore(&ctx->ring.slock, flags);

		ctx->stats.callback_to_poll++;

	}



	if (curr == GSI_CHAN_MODE_POLL &&

			mode == GSI_CHAN_MODE_CALLBACK) {

		spin_lock_irqsave(&ctx->ring.slock, flags);

		atomic_set(&ctx->poll_mode, mode);

		spin_unlock_irqrestore(&ctx->ring.slock, flags);

		spin_lock_irqsave(&gsi_ctx->slock, flags);

		__gsi_config_ieob_irq(gsi_ctx->per.ee, 1 << ctx->evtr->id, ~0);

		spin_unlock_irqrestore(&gsi_ctx->slock, flags);

		ctx->stats.poll_to_callback++;

	}

	spin_unlock_irqrestore(&gsi_ctx->slock, flags);



	return GSI_STATUS_SUCCESS;

}