tree e87a31e3f8a4571cc4b50ee8673f36b7c2051805
parent ab6d7cc3eab4093caf91ba8b27590c4080d7d01c
author Maya Erez <qca_merez@qca.qualcomm.com> 1463426612 +0300
committer Kalle Valo <kvalo@qca.qualcomm.com> 1464423557 +0300

wil6210: protect wil_vring_fini_tx in parallel to tx completions

napi_synchronize is called before releasing the vring, with the
assumption that setting txdata->enabled to 0 will prevent handling
of this vring in the next scheduled napi.
To guarantee this assumption, a memory barrier is added after disabling
the txdata.
In addition, as the ctx is zeroed in wil_tx_complete after this
descriptor is handled (protected by wmb), ctx needs to be checked
before releasing this descriptor in wil_vring_free.

Signed-off-by: Maya Erez <qca_merez@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>