linux-kernel - [PATCH] dmaengine: ti: k3-psil: fix deadlock on error path

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Message-ID: <20200408185501.30776-1-grygorii.strashko@ti.com>
Date:   Wed, 8 Apr 2020 21:55:01 +0300
From:   Grygorii Strashko <grygorii.strashko@...com>
To:     Vinod Koul <vkoul@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Peter Ujfalusi <peter.ujfalusi@...com>,
        <dmaengine@...r.kernel.org>
CC:     Sekhar Nori <nsekhar@...com>, <linux-kernel@...r.kernel.org>,
        Vignesh Raghavendra <vigneshr@...com>,
        <linux-arm-kernel@...ts.infradead.org>,
        Grygorii Strashko <grygorii.strashko@...com>
Subject: [PATCH] dmaengine: ti: k3-psil: fix deadlock on error path

The mutex_unlock() is missed on error path of psil_get_ep_config()
which causes deadlock, so add missed mutex_unlock().

Fixes: 8c6bb62f6b4a ("dmaengine: ti: k3 PSI-L remote endpoint configuration")
Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
---
 drivers/dma/ti/k3-psil.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/dma/ti/k3-psil.c b/drivers/dma/ti/k3-psil.c
index d7b965049ccb..fb7c8150b0d1 100644
--- a/drivers/dma/ti/k3-psil.c
+++ b/drivers/dma/ti/k3-psil.c
@@ -27,6 +27,7 @@ struct psil_endpoint_config *psil_get_ep_config(u32 thread_id)
 			soc_ep_map = &j721e_ep_map;
 		} else {
 			pr_err("PSIL: No compatible machine found for map\n");
+			mutex_unlock(&ep_map_mutex);
 			return ERR_PTR(-ENOTSUPP);
 		}
 		pr_debug("%s: Using map for %s\n", __func__, soc_ep_map->name);
-- 
2.17.1