linux-kernel - [PATCH v2 2/6] floppy: remove incomplete support for second FDC from ARM code

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Date:   Sun,  1 Mar 2020 20:55:51 +0100
From:   Willy Tarreau <w@....eu>
To:     Denis Efremov <efremov@...ux.com>
Cc:     Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org,
        linux-block@...r.kernel.org, Willy Tarreau <w@....eu>,
        Ian Molton <spyro@....com>,
        Russell King <linux@...linux.org.uk>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH v2 2/6] floppy: remove incomplete support for second FDC from ARM code

The ARM code was written with the apparent hope to one day support
a second FDC except that the code was incomplete and only touches
the first one, which is also reflected by N_FDC==1. However this
made its fd_outb() macro artificially depend on the global or local
"fdc" variable.

Let's get rid of this and make it explicit it doesn't rely on this
variable anymore.

Cc: Ian Molton <spyro@....com>
Cc: Russell King <linux@...linux.org.uk>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Willy Tarreau <w@....eu>
---
 arch/arm/include/asm/floppy.h | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

diff --git a/arch/arm/include/asm/floppy.h b/arch/arm/include/asm/floppy.h
index 4655652..7e58979 100644
--- a/arch/arm/include/asm/floppy.h
+++ b/arch/arm/include/asm/floppy.h
@@ -50,17 +50,13 @@ static inline int fd_dma_setup(void *data, unsigned int length,
  * to a non-zero track, and then restoring it to track 0.  If an error occurs,
  * then there is no floppy drive present.       [to be put back in again]
  */
-static unsigned char floppy_selects[2][4] =
-{
-	{ 0x10, 0x21, 0x23, 0x33 },
-	{ 0x10, 0x21, 0x23, 0x33 }
-};
+static unsigned char floppy_selects[4] = { 0x10, 0x21, 0x23, 0x33 };
 
 #define fd_setdor(dor)								\
 do {										\
 	int new_dor = (dor);							\
 	if (new_dor & 0xf0)							\
-		new_dor = (new_dor & 0x0c) | floppy_selects[fdc][new_dor & 3];	\
+		new_dor = (new_dor & 0x0c) | floppy_selects[new_dor & 3];	\
 	else									\
 		new_dor &= 0x0c;						\
 	outb(new_dor, FD_DOR);							\
@@ -84,9 +80,7 @@ do {										\
  */
 static void driveswap(int *ints, int dummy, int dummy2)
 {
-	floppy_selects[0][0] ^= floppy_selects[0][1];
-	floppy_selects[0][1] ^= floppy_selects[0][0];
-	floppy_selects[0][0] ^= floppy_selects[0][1];
+	swap(floppy_selects[0], floppy_selects[1]);
 }
 
 #define EXTRA_FLOPPY_PARAMS ,{ "driveswap", &driveswap, NULL, 0, 0 }
-- 
2.9.0