[PATCH] net: mac8390 - Sort out memory/MMIO accesses and casts (was: Re: drivers/net/mac8390.c: Remove useless memcpy casting)

* [PATCH] net: mac8390 - Sort out memory/MMIO accesses and casts (was:  Re: drivers/net/mac8390.c: Remove useless memcpy casting)
@ 2010-04-15 19:34 Geert Uytterhoeven
  2010-04-16  2:14 ` Finn Thain
  0 siblings, 1 reply; 8+ messages in thread
From: Geert Uytterhoeven @ 2010-04-15 19:34 UTC (permalink / raw)
  To: Joe Perches, Finn Thain
  Cc: David S. Miller, netdev, Linux Kernel Mailing List, Linux/m68k

On Mon, Mar 8, 2010 at 18:16, Joe Perches <joe@perches.com> wrote:
> On Sun, 2010-03-07 at 10:19 +0100, Geert Uytterhoeven wrote:
>> ... hence you introduced 3 compiler warnings:
>>
>> drivers/net/mac8390.c:249: warning: passing argument 1 of
>> '__builtin_memcpy' makes pointer from integer without a cast
>> drivers/net/mac8390.c:254: warning: passing argument 1 of
>> 'word_memcpy_tocard' makes pointer from integer without a cast
>> drivers/net/mac8390.c:256: warning: passing argument 2 of
>> 'word_memcpy_fromcard' makes pointer from integer without a cast
>
> Thanks, I'll submit a patch to fix it by tomorrow or so.

It hasn't been fixed yet. But here's a better solution.
I do not have the hardware to test it, though.
Finn, does it {look OK,work}?

>From 7ef849741922afa7b613f271f414024c454a0d23 Mon Sep 17 00:00:00 2001
From: Geert Uytterhoeven <geert@linux-m68k.org>
Date: Wed, 14 Apr 2010 18:48:50 +0200
Subject: [PATCH] net: mac8390 - Sort out memory/MMIO accesses and casts

commit 5c7fffd0e3b57cb63f50bbd710868f012d67654f ("drivers/net/mac8390.c: Remove
useless memcpy casting") removed too many casts, introducing the following
warnings:

| drivers/net/mac8390.c:248: warning: passing argument 1 of
'__builtin_memcpy' makes pointer from integer without a cast
| drivers/net/mac8390.c:253: warning: passing argument 1 of
'word_memcpy_tocard' makes pointer from integer without a cast
| drivers/net/mac8390.c:255: warning: passing argument 2 of
'word_memcpy_fromcard' makes pointer from integer without a cast

Instead of just readding the casts,
  - move all casts inside word_memcpy_{to,from}card(),
  - replace an incorrect memcpy() by memcpy_toio(),
  - add memcmp_withio() as a wrapper around memcmp(),
  - replace an incorrect memcpy_toio() by memcpy_fromio().

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
---
 drivers/net/mac8390.c |   44 ++++++++++++++++++++++----------------------
 1 files changed, 22 insertions(+), 22 deletions(-)

diff --git a/drivers/net/mac8390.c b/drivers/net/mac8390.c
index c8e68fd..8c96e9c 100644
--- a/drivers/net/mac8390.c
+++ b/drivers/net/mac8390.c
@@ -157,6 +157,8 @@ static void dayna_block_output(struct net_device
*dev, int count,
 #define memcpy_fromio(a, b, c)	memcpy((a), (void *)(b), (c))
 #define memcpy_toio(a, b, c)	memcpy((void *)(a), (b), (c))

+#define memcmp_withio(a, b, c)	memcmp((a), (void *)(b), (c))
+
 /* Slow Sane (16-bit chunk memory read/write) Cabletron uses this */
 static void slow_sane_get_8390_hdr(struct net_device *dev,
 				   struct e8390_pkt_hdr *hdr, int ring_page);
@@ -164,8 +166,8 @@ static void slow_sane_block_input(struct
net_device *dev, int count,
 				  struct sk_buff *skb, int ring_offset);
 static void slow_sane_block_output(struct net_device *dev, int count,
 				   const unsigned char *buf, int start_page);
-static void word_memcpy_tocard(void *tp, const void *fp, int count);
-static void word_memcpy_fromcard(void *tp, const void *fp, int count);
+static void word_memcpy_tocard(unsigned long tp, const void *fp, int count);
+static void word_memcpy_fromcard(void *tp, unsigned long fp, int count);

 static enum mac8390_type __init mac8390_ident(struct nubus_dev *dev)
 {
@@ -245,9 +247,9 @@ static enum mac8390_access __init
mac8390_testio(volatile unsigned long membase)
 	unsigned long outdata = 0xA5A0B5B0;
 	unsigned long indata =  0x00000000;
 	/* Try writing 32 bits */
-	memcpy(membase, &outdata, 4);
+	memcpy_toio(membase, &outdata, 4);
 	/* Now compare them */
-	if (memcmp((char *)&outdata, (char *)membase, 4) == 0)
+	if (memcmp_withio(&outdata, membase, 4) == 0)
 		return ACCESS_32;
 	/* Write 16 bit output */
 	word_memcpy_tocard(membase, &outdata, 4);
@@ -733,7 +735,7 @@ static void sane_get_8390_hdr(struct net_device *dev,
 			      struct e8390_pkt_hdr *hdr, int ring_page)
 {
 	unsigned long hdr_start = (ring_page - WD_START_PG)<<8;
-	memcpy_fromio((void *)hdr, (char *)dev->mem_start + hdr_start, 4);
+	memcpy_fromio(hdr, dev->mem_start + hdr_start, 4);
 	/* Fix endianness */
 	hdr->count = swab16(hdr->count);
 }
@@ -747,14 +749,13 @@ static void sane_block_input(struct net_device
*dev, int count,
 	if (xfer_start + count > ei_status.rmem_end) {
 		/* We must wrap the input move. */
 		int semi_count = ei_status.rmem_end - xfer_start;
-		memcpy_fromio(skb->data, (char *)dev->mem_start + xfer_base,
+		memcpy_fromio(skb->data, dev->mem_start + xfer_base,
 			      semi_count);
 		count -= semi_count;
-		memcpy_toio(skb->data + semi_count,
-			    (char *)ei_status.rmem_start, count);
-	} else {
-		memcpy_fromio(skb->data, (char *)dev->mem_start + xfer_base,
+		memcpy_fromio(skb->data + semi_count, ei_status.rmem_start,
 			      count);
+	} else {
+		memcpy_fromio(skb->data, dev->mem_start + xfer_base, count);
 	}
 }

@@ -763,7 +764,7 @@ static void sane_block_output(struct net_device
*dev, int count,
 {
 	long shmem = (start_page - WD_START_PG)<<8;

-	memcpy_toio((char *)dev->mem_start + shmem, buf, count);
+	memcpy_toio(dev->mem_start + shmem, buf, count);
 }

 /* dayna block input/output */
@@ -814,7 +815,7 @@ static void slow_sane_get_8390_hdr(struct net_device *dev,
 				   int ring_page)
 {
 	unsigned long hdr_start = (ring_page - WD_START_PG)<<8;
-	word_memcpy_fromcard(hdr, (char *)dev->mem_start + hdr_start, 4);
+	word_memcpy_fromcard(hdr, dev->mem_start + hdr_start, 4);
 	/* Register endianism - fix here rather than 8390.c */
 	hdr->count = (hdr->count&0xFF)<<8|(hdr->count>>8);
 }
@@ -828,15 +829,14 @@ static void slow_sane_block_input(struct
net_device *dev, int count,
 	if (xfer_start + count > ei_status.rmem_end) {
 		/* We must wrap the input move. */
 		int semi_count = ei_status.rmem_end - xfer_start;
-		word_memcpy_fromcard(skb->data,
-				     (char *)dev->mem_start + xfer_base,
+		word_memcpy_fromcard(skb->data, dev->mem_start + xfer_base,
 				     semi_count);
 		count -= semi_count;
 		word_memcpy_fromcard(skb->data + semi_count,
-				     (char *)ei_status.rmem_start, count);
+				     ei_status.rmem_start, count);
 	} else {
-		word_memcpy_fromcard(skb->data,
-				     (char *)dev->mem_start + xfer_base, count);
+		word_memcpy_fromcard(skb->data, dev->mem_start + xfer_base,
+				     count);
 	}
 }

@@ -845,12 +845,12 @@ static void slow_sane_block_output(struct
net_device *dev, int count,
 {
 	long shmem = (start_page - WD_START_PG)<<8;

-	word_memcpy_tocard((char *)dev->mem_start + shmem, buf, count);
+	word_memcpy_tocard(dev->mem_start + shmem, buf, count);
 }

-static void word_memcpy_tocard(void *tp, const void *fp, int count)
+static void word_memcpy_tocard(unsigned long tp, const void *fp, int count)
 {
-	volatile unsigned short *to = tp;
+	volatile unsigned short *to = (void *)tp;
 	const unsigned short *from = fp;

 	count++;
@@ -860,10 +860,10 @@ static void word_memcpy_tocard(void *tp, const
void *fp, int count)
 		*to++ = *from++;
 }

-static void word_memcpy_fromcard(void *tp, const void *fp, int count)
+static void word_memcpy_fromcard(void *tp, unsigned long fp, int count)
 {
 	unsigned short *to = tp;
-	const volatile unsigned short *from = fp;
+	const volatile unsigned short *from = (const void *)fp;

 	count++;
 	count /= 2;
-- 
1.6.0.4

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds

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