ata: libata-transport: fix {dma|pio|xfer}_mode sysfs files

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@omp.ru>
Cc: stable@vger.kernel.org
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/Documentation/ABI/testing/sysfs-ata b/Documentation/ABI/testing/sysfs-ata
index aa4296498859e49617cc7fc6f377c6dcb7a8f6c1..c5dda2bc477d434e150227403995fe43a3e47393 100644 (file)
--- 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
 

diff --git a/drivers/ata/libata-transport.c b/drivers/ata/libata-transport.c
index 19e6e539a061b93a6ac81975a69b3cdba7b1d699..ecc257fa5a5411b166a10397f0a684e3061051f6 100644 (file)
--- 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