linux-kernel - [PATCH v2 3/4] ipc: Handle error conditions in ipc command

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Date:	Thu, 14 Nov 2013 14:15:06 -0800
From:	David Cohen <david.a.cohen@...ux.intel.com>
To:	matthew.garrett@...ula.com
Cc:	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
	gnomes@...rguk.ukuu.org.uk, david.a.cohen@...ux.intel.com,
	sathyanarayanan.kuppuswamy@...ux.intel.com,
	eric.ernst@...ux.intel.com
Subject: [PATCH v2 3/4] ipc: Handle error conditions in ipc command

From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>

Handle error conditions in intel_scu_ipc_command() and
pwr_reg_rdwr().

Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
Signed-off-by: David Cohen <david.a.cohen@...ux.intel.com>
---
 drivers/platform/x86/intel_scu_ipc.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/platform/x86/intel_scu_ipc.c b/drivers/platform/x86/intel_scu_ipc.c
index 86b6ce2a7a47..e26830f6c8dd 100644
--- a/drivers/platform/x86/intel_scu_ipc.c
+++ b/drivers/platform/x86/intel_scu_ipc.c
@@ -235,7 +235,7 @@ static int pwr_reg_rdwr(u16 *addr, u8 *data, u32 count, u32 op, u32 id)
 	}
 
 	err = busy_loop();
-	if (id == IPC_CMD_PCNTRL_R) { /* Read rbuf */
+	if (!err && id == IPC_CMD_PCNTRL_R) { /* Read rbuf */
 		/* Workaround: values are read as 0 without memcpy_fromio */
 		memcpy_fromio(cbuf, ipcdev.ipc_base + 0x90, 16);
 		for (nc = 0; nc < count; nc++)
@@ -465,8 +465,10 @@ int intel_scu_ipc_command(int cmd, int sub, u32 *in, int inlen,
 	ipc_command((inlen << 16) | (sub << 12) | cmd);
 	err = busy_loop();
 
-	for (i = 0; i < outlen; i++)
-		*out++ = ipc_data_readl(4 * i);
+	if (!err) {
+		for (i = 0; i < outlen; i++)
+			*out++ = ipc_data_readl(4 * i);
+	}
 
 	mutex_unlock(&ipclock);
 	return err;
-- 
1.8.4.2

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