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| author | Chris Bagwell <chris@cnpbagwell.com> | 2013-01-23 19:37:34 -0800 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2013-01-23 19:38:52 -0800 |
| commit | 9937c026820baabd1e908a9c1e6bdc846293000a (patch) | |
| tree | 461b2c70b16edf74c7d5444951133c534a007c93 /drivers/input/tablet/wacom_sys.c | |
| parent | b666263b71cb1f3b96fb79e69de7f119062b0da2 (diff) | |
| download | lwn-9937c026820baabd1e908a9c1e6bdc846293000a.tar.gz lwn-9937c026820baabd1e908a9c1e6bdc846293000a.zip | |
Input: wacom - fix wacom_set_report retry logic
Logic sets a value and then reads it back to make sure it worked
and retries write on failures. Since read and write share a buffer,
it needs to be set back up before writing though.
Issue is not seen a lot because 1) it doesn't need to retry for
a lot of tablets and 2) a lot of failures that need a retry are
from an -ETIMEDOUT and hopefully buffer is not touched in this case.
At least one user has shown logs with buffer being modified during
-ETIMEDOUT case with linux 3.7 kernel.
Signed-off-by: Chris Bagwell <chris@cnpbagwell.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers/input/tablet/wacom_sys.c')
| -rw-r--r-- | drivers/input/tablet/wacom_sys.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/input/tablet/wacom_sys.c b/drivers/input/tablet/wacom_sys.c index f92d34f45a1c..aaf23aeae2ea 100644 --- a/drivers/input/tablet/wacom_sys.c +++ b/drivers/input/tablet/wacom_sys.c @@ -553,10 +553,10 @@ static int wacom_set_device_mode(struct usb_interface *intf, int report_id, int if (!rep_data) return error; - rep_data[0] = report_id; - rep_data[1] = mode; - do { + rep_data[0] = report_id; + rep_data[1] = mode; + error = wacom_set_report(intf, WAC_HID_FEATURE_REPORT, report_id, rep_data, length, 1); if (error >= 0) |