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rt2x00: tune multi-registers I/O timeout

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We provide timeout value to rt2x00usb_vendor_request_buff() based on
number of registers to process. That value is passed down to
rt2x00usb_vendor_req_buff_lock() and ends in usb_control_msg(). But we
do not read/write all registers in rt2x00usb_vendor_req_buff_lock() at
once. We read/write them in chunks of 64 bytes in the loop, hence passed
timeout value to low level is too big.

Patch removes timeout argument from rt2x00usb_vendor_request_buff() and
use short REGISTER_TIMEOUT in rt2x00usb_vendor_req_buff_lock(). That
timeout value should be fine for 64 bytes and smaller requests. For
EEPROM read we introduced new timeout value equal to 2 seconds.

Patch fixes process uninterruptible sleep stalls for long period, when
USB bus has problem to satisfy a request and we wait very long time on
usb_start_wait_urb().

Reported-and-tested-by: Sakari Ailus <sakari.ailus@iki.fi>
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Stanislaw Gruszka
2014-10-08 14:16:37 +02:00
committed by John W. Linville
parent ab54bc8460
commit e9dc51aa2b
3 changed files with 17 additions and 36 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/net/wireless/rt2x00/rt2500usb.c
View File

@@ -62,7 +62,7 @@ static inline void rt2500usb_register_read(struct rt2x00_dev *rt2x00dev,
__le16 reg;
rt2x00usb_vendor_request_buff(rt2x00dev, USB_MULTI_READ,
USB_VENDOR_REQUEST_IN, offset,
&reg, sizeof(reg), REGISTER_TIMEOUT);
&reg, sizeof(reg));
*value = le16_to_cpu(reg);
}
@@ -83,8 +83,7 @@ static inline void rt2500usb_register_multiread(struct rt2x00_dev *rt2x00dev,
{
rt2x00usb_vendor_request_buff(rt2x00dev, USB_MULTI_READ,
USB_VENDOR_REQUEST_IN, offset,
value, length,
REGISTER_TIMEOUT16(length));
value, length);
}
static inline void rt2500usb_register_write(struct rt2x00_dev *rt2x00dev,
@@ -94,7 +93,7 @@ static inline void rt2500usb_register_write(struct rt2x00_dev *rt2x00dev,
__le16 reg = cpu_to_le16(value);
rt2x00usb_vendor_request_buff(rt2x00dev, USB_MULTI_WRITE,
USB_VENDOR_REQUEST_OUT, offset,
&reg, sizeof(reg), REGISTER_TIMEOUT);
&reg, sizeof(reg));
}
static inline void rt2500usb_register_write_lock(struct rt2x00_dev *rt2x00dev,
@@ -113,8 +112,7 @@ static inline void rt2500usb_register_multiwrite(struct rt2x00_dev *rt2x00dev,
{
rt2x00usb_vendor_request_buff(rt2x00dev, USB_MULTI_WRITE,
USB_VENDOR_REQUEST_OUT, offset,
value, length,
REGISTER_TIMEOUT16(length));
value, length);
}
static int rt2500usb_regbusy_read(struct rt2x00_dev *rt2x00dev,