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Don't reset the configuration if desired config is already active (#6)

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Fixes issue #5
This commit is contained in:
Filzmaier Josef
2017-06-29 14:31:12 +02:00
committed by zagrodzki
parent aa64bae804
commit 9fc0278283
2 changed files with 9 additions and 3 deletions
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3
AUTHORS
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@@ -10,4 +10,5 @@ Pieter Joost van de Sande <pj@born2code.net>
Ivan Krasin <imkrasin@gmail.com>
Jirawat I. <nodtem66@gmail.com>
Thordur Bjornsson <thorduri@secnorth.net>
Vincent Serpoul <vincent@serpoul.com>
Vincent Serpoul <vincent@serpoul.com>
Josef Filzmaier <josef.filzmaier@gmail.com>

9
device.go
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@@ -128,8 +128,13 @@ func (d *Device) Config(cfgNum int) (*Config, error) {
dev: d,
claimed: make(map[int]bool),
}
if err := libusb.setConfig(d.handle, uint8(cfgNum)); err != nil {
return nil, fmt.Errorf("failed to set active config %d for the device %s: %v", cfgNum, d, err)
if activeCfgNum, err := d.ActiveConfigNum(); err != nil {
return nil, fmt.Errorf("failed to query active config of the device %s: %v", d, err)
} else if cfgNum != activeCfgNum {
if err := libusb.setConfig(d.handle, uint8(cfgNum)); err != nil {
return nil, fmt.Errorf("failed to set active config %d for the device %s: %v", cfgNum, d, err)
}
}
d.mu.Lock()
defer d.mu.Unlock()