[M] Change in flashrom[master]: amd_imc.c: Cleanup C89ism and redundant NULL check

[Edward O'Callaghan (Code Review)]

Edward O'Callaghan has uploaded this change for review. ( https://review.coreboot.org/c/flashrom/+/75359 )

Change subject: amd_imc.c: Cleanup C89ism and redundant NULL check
......................................................................

amd_imc.c: Cleanup C89ism and redundant NULL check

A bit of spring cleaning here to freshen up some C89ism's,
drop a redundant NULLality check in a static local function
and canonicalise branch predictions. Also const correct some
static locals while here.

This makes the code overall shorter and more consistent and
succinct.

Change-Id: I1dbae500010fa50a67609efb3cbb5778b684ad04
Signed-off-by: Edward O'Callaghan 
---
M amd_imc.c
1 file changed, 27 insertions(+), 24 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/59/75359/1

diff --git a/amd_imc.c b/amd_imc.c
index d57728e..e50aa48 100644
--- a/amd_imc.c
+++ b/amd_imc.c
@@ -34,21 +34,12 @@

static uint16_t get_sio_port(struct pci_dev *dev)
 {
-	uint16_t ec_port;
-
-	if (!dev) {
-		return 0;
-	}
-
-	ec_port = pci_read_word(dev, 0xa4);
-
    /* EcPortActive? */
+	const uint16_t ec_port = pci_read_word(dev, 0xa4);
    if (!(ec_port & 0x1))
    	return 0;

-	ec_port &= ~0x1;
-
-	return ec_port;
+	return ec_port & ~0x1;
 }

/* Wait for up to 10 ms for a response. */
@@ -67,8 +58,6 @@

static uint16_t mbox_get_port(uint16_t sio_port)
 {
-	uint16_t mbox_port;
-
    enter_conf_mode_ec(sio_port);

/* Go to LDN 9, mailbox */
@@ -80,7 +69,7 @@
    	return 0;
    }

-	mbox_port = sio_read(sio_port, 0x60) << 8;
+	uint16_t mbox_port = sio_read(sio_port, 0x60) << 8;
    mbox_port |= sio_read(sio_port, 0x61);

exit_conf_mode_ec(sio_port);
@@ -90,19 +79,16 @@
 /* Returns negative values when IMC is inactive, positive values on errors */
 static int imc_send_cmd(struct pci_dev *dev, uint8_t cmd)
 {
-	uint16_t sio_port;
-	uint16_t mbox_port;
-
    /* IntegratedEcPresent? */
    if (!(pci_read_byte(dev, 0x40) & (1 << 7)))
    	return -1;

-	sio_port = get_sio_port(dev);
+	const uint16_t sio_port = get_sio_port(dev);
    if (!sio_port)
    	return -1;

msg_pdbg2("IMC SIO is at 0x%x.\n", sio_port);
-	mbox_port = mbox_get_port(sio_port);
+	const uint16_t mbox_port = mbox_get_port(sio_port);
    if (!mbox_port)
    	return -1;
    msg_pdbg2("IMC MBOX is at 0x%x.\n", mbox_port);
@@ -119,9 +105,8 @@
 static int imc_resume(void *data)
 {
    struct pci_dev *dev = data;
-	int ret = imc_send_cmd(dev, 0xb5);
-
-	if (ret != 0)
+	const int ret = imc_send_cmd(dev, 0xb5);
+	if (ret)
    	msg_pinfo("Resuming IMC failed.\n");
    else
    	msg_pdbg2("IMC resumed.\n");
@@ -131,7 +116,7 @@
 int amd_imc_shutdown(struct pci_dev *dev)
 {
    /* Try to put IMC to sleep */
-	int ret = imc_send_cmd(dev, 0xb4);
+	const int ret = imc_send_cmd(dev, 0xb4);

/* No IMC activity detectable, assume we are fine */
    if (ret < 0) {
@@ -139,7 +124,7 @@
    	return 0;
    }

-	if (ret != 0) {
+	if (ret) {
    	msg_perr("Shutting down IMC failed.\n");
    	return ret;
    }