From: Finn Thain <fthain@linux-m68k.org>
To: Jens Axboe <axboe@kernel.dk>, Laurent Vivier <laurent@vivier.eu>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>,
Joshua Thompson <funaho@jurai.org>,
linux-block@vger.kernel.org, linux-m68k@lists.linux-m68k.org,
linux-kernel@vger.kernel.org
Subject: [PATCH v2 15/32] swim: Don't use the mark register to read data
Date: Mon, 17 Aug 2026 11:17:10 +1000 [thread overview]
Message-ID: <ad1d9410d5f0fdd7da58081aa4a22bfe7f1c5072.1786929430.git.fthain@linux-m68k.org> (raw)
In-Reply-To: <cover.1786929430.git.fthain@linux-m68k.org>
If an unexpected mark byte were to be read from the data register, an
error would be flagged. But no error gets flagged when such a byte is
read from the mark register, which is misleading. Always use the data
register except when a mark byte is expected.
Fixes: 8852ecd97488 ("m68k: mac - Add SWIM floppy support")
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Signed-off-by: Finn Thain <fthain@linux-m68k.org>
---
drivers/block/swim_asm.S | 21 +++++++++++----------
1 file changed, 11 insertions(+), 10 deletions(-)
diff --git a/drivers/block/swim_asm.S b/drivers/block/swim_asm.S
index aa61ecc1af96..b12289bed2f0 100644
--- a/drivers/block/swim_asm.S
+++ b/drivers/block/swim_asm.S
@@ -47,11 +47,11 @@
.global swim_read_sector_header
swim_read_sector_header:
link %a6, #0
- moveml %d1-%d5/%a0-%a4,%sp@-
+ moveml %d1-%d5/%a0-%a5,%sp@-
movel %a6@(0x0c), %a4
moveq #-1, %d0
bsr mfm_read_addrmark
- moveml %sp@+, %d1-%d5/%a0-%a4
+ moveml %sp@+, %d1-%d5/%a0-%a5
unlk %a6
rts
@@ -63,6 +63,7 @@ sector_data_mark:
mfm_read_addrmark:
movel %a6@(0x08), %a3
lea %a3@(read_handshake), %a2
+ lea %a3@(read_data), %a5
lea %a3@(read_mark), %a3
movew #seek_time, %d2
@@ -93,7 +94,7 @@ amark0: tstb %a2@
dbmi %d2, amark0
bpl signal_nonyb
- moveb %a3@, %a4@(o_track)
+ moveb %a5@, %a4@(o_track)
moveq #max_retry, %d2
@@ -101,7 +102,7 @@ amark1: tstb %a2@
dbmi %d2, amark1
bpl signal_nonyb
- moveb %a3@, %a4@(o_side)
+ moveb %a5@, %a4@(o_side)
moveq #max_retry, %d2
@@ -109,7 +110,7 @@ amark2: tstb %a2@
dbmi %d2, amark2
bpl signal_nonyb
- moveb %a3@, %a4@(o_sector)
+ moveb %a5@, %a4@(o_sector)
moveq #max_retry, %d2
@@ -117,7 +118,7 @@ amark3: tstb %a2@
dbmi %d2, amark3
bpl signal_nonyb
- moveb %a3@, %a4@(o_size)
+ moveb %a5@, %a4@(o_size)
moveq #max_retry, %d2
@@ -125,7 +126,7 @@ crc0: tstb %a2@
dbmi %d2, crc0
bpl signal_nonyb
- moveb %a3@, %a4@(o_crc0)
+ moveb %a5@, %a4@(o_crc0)
moveq #max_retry, %d2
@@ -133,7 +134,7 @@ crc1: moveb %a2@, %d5
dbmi %d2, crc1
bpl signal_nonyb
- moveb %a3@, %a4@(o_crc1)
+ moveb %a5@, %a4@(o_crc1)
moveb %a2@, %d5
andb #.Lhr_crc_error, %d5
@@ -212,7 +213,7 @@ data_crc0:
dbmi %d2, data_crc0
bpl data_exit
- moveb %a3@, %d2
+ moveb %a5@, %d2
moveq #max_retry, %d2
@@ -222,7 +223,7 @@ data_crc1:
dbmi %d2, data_crc1
bpl data_exit
- moveb %a3@, %d2
+ moveb %a5@, %d2
moveb %a2@, %d5
andb #.Lhr_crc_error, %d5
--
2.52.0
next prev parent reply other threads:[~2026-08-17 1:56 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-17 1:17 [PATCH v2 00/32] block/swim: Fixes and improvements Finn Thain
2026-08-17 1:17 ` [PATCH v2 07/32] swim: Enable clock divider only where appropriate Finn Thain
2026-08-31 7:38 ` Geert Uytterhoeven
2026-09-01 7:56 ` Finn Thain
2026-09-01 9:10 ` Geert Uytterhoeven
2026-08-17 1:17 ` [PATCH v2 11/32] swim: Handle FIFO timeout error Finn Thain
2026-08-17 1:17 ` [PATCH v2 25/32] swim: Remove pointless specifiers Finn Thain
2026-08-17 1:17 ` [PATCH v2 05/32] swim: Perform ISM/IWM mode switching according to specs Finn Thain
2026-08-17 1:17 ` [PATCH v2 16/32] swim: Fix buffer overflow Finn Thain
2026-08-17 1:17 ` [PATCH v2 04/32] swim: Don't disable drive after every sector Finn Thain
2026-08-17 1:17 ` [PATCH v2 19/32] swim: Deduplicate polling loops Finn Thain
2026-08-17 1:17 ` [PATCH v2 06/32] swim: Configure parameter memory Finn Thain
2026-08-17 1:17 ` [PATCH v2 01/32] swim: Assert strobe with stable outputs Finn Thain
2026-08-17 1:17 ` [PATCH v2 14/32] swim: Check error register during sector read Finn Thain
2026-08-17 1:17 ` [PATCH v2 12/32] swim: Simplify return value initialization Finn Thain
2026-08-17 1:17 ` [PATCH v2 30/32] swim: Define macros for constants Finn Thain
2026-08-17 1:17 ` [PATCH v2 21/32] swim: Revisit delays Finn Thain
2026-08-17 1:17 ` Finn Thain [this message]
2026-08-17 1:17 ` [PATCH v2 29/32] swim: Clean up whitespace Finn Thain
2026-08-17 1:17 ` [PATCH v2 22/32] swim: Remove pointless mode0 register write Finn Thain
2026-08-17 1:17 ` [PATCH v2 02/32] swim: Select appropriate drive once only Finn Thain
2026-08-17 1:17 ` [PATCH v2 32/32] swim: Unexport global symbols Finn Thain
2026-08-17 1:17 ` [PATCH v2 27/32] swim: Add some helpful references Finn Thain
2026-08-17 1:17 ` [PATCH v2 08/32] swim: Don't start motor until medium is present Finn Thain
2026-08-17 1:17 ` [PATCH v2 09/32] swim: Recalibrate when drive is probed Finn Thain
2026-08-17 1:17 ` [PATCH v2 10/32] swim: Add track zero recalibration delay Finn Thain
2026-08-17 1:17 ` [PATCH v2 23/32] swim: Don't needlessly re-read sectors Finn Thain
2026-08-17 1:17 ` [PATCH v2 17/32] swim: Convert to blocking queue Finn Thain
2026-08-17 1:17 ` [PATCH v2 24/32] swim: Don't search beyond the first data mark Finn Thain
2026-08-17 1:17 ` [PATCH v2 18/32] swim: Remove redundant RELAX actions Finn Thain
2026-08-17 1:17 ` [PATCH v2 13/32] swim: Check for CRC errors Finn Thain
2026-08-17 1:17 ` [PATCH v2 03/32] swim: Enable the drive when probing Finn Thain
2026-08-17 1:17 ` [PATCH v2 31/32] swim: Define symbols for constants Finn Thain
2026-08-17 1:17 ` [PATCH v2 26/32] swim: Move swd initialization Finn Thain
2026-08-17 1:17 ` [PATCH v2 20/32] swim: Check drive ready bit Finn Thain
2026-08-17 1:17 ` [PATCH v2 28/32] swim: Remove unused macro definitions Finn Thain
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