linux-kernel - [PATCH 7/8] msm: scm: Add logging of actual return code from scm call

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Message-Id: <1407202310-3359-8-git-send-email-sboyd@codeaurora.org>
Date:	Mon,  4 Aug 2014 18:31:49 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	David Brown <davidb@...eaurora.org>,
	Kumar Gala <galak@...eaurora.org>
Cc:	Olav Haugan <ohaugan@...eaurora.org>, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Lina Iyer <lina.iyer@...aro.org>
Subject: [PATCH 7/8] msm: scm: Add logging of actual return code from scm call

From: Olav Haugan <ohaugan@...eaurora.org>

When an error occurs during an scm call the error returned is
remapped so we lose the original error code. This means that
when an error occurs we have no idea what actually failed within
the secure environment.

Add a logging statement that will log the actual error code from
scm call allowing us to easily determine what caused the error
to occur.

Signed-off-by: Olav Haugan <ohaugan@...eaurora.org>
Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
---
 arch/arm/mach-qcom/scm.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-qcom/scm.c b/arch/arm/mach-qcom/scm.c
index 7c62c03324f4..cfd4717aec78 100644
--- a/arch/arm/mach-qcom/scm.c
+++ b/arch/arm/mach-qcom/scm.c
@@ -152,6 +152,7 @@ static inline void *scm_get_response_buffer(const struct scm_response *rsp)
 
 static int scm_remap_error(int err)
 {
+	pr_err("scm_call failed with error code %d\n", err);
 	switch (err) {
 	case SCM_ERROR:
 		return -EIO;
-- 
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