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| author | Kevin Daughtridge <kevin@kdau.com> | 2012-09-20 12:00:32 -0700 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2012-10-01 10:09:26 +0200 |
| commit | 86e6b77eb7cf9ca2e9c7092b4dfd588f0a3307b6 (patch) | |
| tree | d00ef9d1f11bae93c5e809246f8eae156d74b1ed /drivers/hid/usbhid/hid-core.c | |
| parent | 4cc9834518efed3b69d3a8ff3bd162e089f68d34 (diff) | |
| download | linux-86e6b77eb7cf9ca2e9c7092b4dfd588f0a3307b6.tar.gz linux-86e6b77eb7cf9ca2e9c7092b4dfd588f0a3307b6.tar.bz2 linux-86e6b77eb7cf9ca2e9c7092b4dfd588f0a3307b6.zip | |
HID: keep dev_rdesc unmodified and use it for comparisons
The dev_rdesc member of the hid_device structure is meant to store the original
report descriptor received from the device, but it is currently passed to any
report_fixup method before it is copied to the rdesc member. This patch uses a
temporary buffer to shield dev_rdesc from the side effects of many HID drivers'
report_fixup implementations.
usbhid's hid_post_reset checks the report descriptor currently returned by the
device against a descriptor that may have been modified by a driver's
report_fixup method. That leaves some devices nonfunctional after a resume, with
a "reset_resume error 1" reported. This patch checks the new descriptor against
the unmodified dev_rdesc instead and uses the original, instead of modified,
report size.
BugLink: http://bugs.launchpad.net/bugs/1049623
Signed-off-by: Kevin Daughtridge <kevin@kdau.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid/usbhid/hid-core.c')
| -rw-r--r-- | drivers/hid/usbhid/hid-core.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c index dedd8e4e5c6d..8e0c4bf94ebc 100644 --- a/drivers/hid/usbhid/hid-core.c +++ b/drivers/hid/usbhid/hid-core.c @@ -1415,20 +1415,20 @@ static int hid_post_reset(struct usb_interface *intf) * configuration descriptors passed, we already know that * the size of the HID report descriptor has not changed. */ - rdesc = kmalloc(hid->rsize, GFP_KERNEL); + rdesc = kmalloc(hid->dev_rsize, GFP_KERNEL); if (!rdesc) { dbg_hid("couldn't allocate rdesc memory (post_reset)\n"); return 1; } status = hid_get_class_descriptor(dev, interface->desc.bInterfaceNumber, - HID_DT_REPORT, rdesc, hid->rsize); + HID_DT_REPORT, rdesc, hid->dev_rsize); if (status < 0) { dbg_hid("reading report descriptor failed (post_reset)\n"); kfree(rdesc); return 1; } - status = memcmp(rdesc, hid->rdesc, hid->rsize); + status = memcmp(rdesc, hid->dev_rdesc, hid->dev_rsize); kfree(rdesc); if (status != 0) { dbg_hid("report descriptor changed\n"); |