This is a note to let you know that I've just added the patch titled
ata: libata-transport: fix {dma|pio|xfer}_mode sysfs files
to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ata-libata-transport-fix-dma-pio-xfer-_mode-sysfs-files.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 72aad489f992871e908ff6d9055b26c6366fb864 Mon Sep 17 00:00:00 2001
From: Sergey Shtylyov <s.shtylyov@xxxxxx>
Date: Wed, 8 Jun 2022 22:51:07 +0300
Subject: ata: libata-transport: fix {dma|pio|xfer}_mode sysfs files
From: Sergey Shtylyov <s.shtylyov@xxxxxx>
commit 72aad489f992871e908ff6d9055b26c6366fb864 upstream.
The {dma|pio}_mode sysfs files are incorrectly documented as having a
list of the supported DMA/PIO transfer modes, while the corresponding
fields of the *struct* ata_device hold the transfer mode IDs, not masks.
To match these docs, the {dma|pio}_mode (and even xfer_mode!) sysfs
files are handled by the ata_bitfield_name_match() macro which leads to
reading such kind of nonsense from them:
$ cat /sys/class/ata_device/dev3.0/pio_mode
XFER_UDMA_7, XFER_UDMA_6, XFER_UDMA_5, XFER_UDMA_4, XFER_MW_DMA_4,
XFER_PIO_6, XFER_PIO_5, XFER_PIO_4, XFER_PIO_3, XFER_PIO_2, XFER_PIO_1,
XFER_PIO_0
Using the correct ata_bitfield_name_search() macro fixes that:
$ cat /sys/class/ata_device/dev3.0/pio_mode
XFER_PIO_4
While fixing the file documentation, somewhat reword the {dma|pio}_mode
file doc and add a note about being mostly useful for PATA devices to
the xfer_mode file doc...
Fixes: d9027470b886 ("[libata] Add ATA transport class")
Signed-off-by: Sergey Shtylyov <s.shtylyov@xxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Damien Le Moal <damien.lemoal@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
Documentation/ABI/testing/sysfs-ata | 5 +++--
drivers/ata/libata-transport.c | 2 +-
2 files changed, 4 insertions(+), 3 deletions(-)
--- a/Documentation/ABI/testing/sysfs-ata
+++ b/Documentation/ABI/testing/sysfs-ata
@@ -59,17 +59,18 @@ class
dma_mode
- Transfer modes supported by the device when in DMA mode.
+ DMA transfer mode used by the device.
Mostly used by PATA device.
pio_mode
- Transfer modes supported by the device when in PIO mode.
+ PIO transfer mode used by the device.
Mostly used by PATA device.
xfer_mode
Current transfer mode.
+ Mostly used by PATA device.
id
--- a/drivers/ata/libata-transport.c
+++ b/drivers/ata/libata-transport.c
@@ -196,7 +196,7 @@ static struct {
{ XFER_PIO_0, "XFER_PIO_0" },
{ XFER_PIO_SLOW, "XFER_PIO_SLOW" }
};
-ata_bitfield_name_match(xfer,ata_xfer_names)
+ata_bitfield_name_search(xfer, ata_xfer_names)
/*
* ATA Port attributes
Patches currently in stable-queue which might be from s.shtylyov@xxxxxx are
queue-4.14/ata-pata_octeon_cf-fix-refcount-leak-in-octeon_cf_pr.patch
queue-4.14/ata-libata-transport-fix-dma-pio-xfer-_mode-sysfs-files.patch
