diff options
Diffstat (limited to 'drivers/net/wireless/rt2x00/rt2x00.h')
| -rw-r--r-- | drivers/net/wireless/rt2x00/rt2x00.h | 19 |
1 files changed, 9 insertions, 10 deletions
diff --git a/drivers/net/wireless/rt2x00/rt2x00.h b/drivers/net/wireless/rt2x00/rt2x00.h index baccea7184b5..fee61bee1e7e 100644 --- a/drivers/net/wireless/rt2x00/rt2x00.h +++ b/drivers/net/wireless/rt2x00/rt2x00.h @@ -746,16 +746,15 @@ struct rt2x00_dev { } csr; /* - * Mutex to protect register accesses on USB devices. - * There are 2 reasons this is needed, one is to ensure - * use of the csr_cache (for USB devices) by one thread - * isn't corrupted by another thread trying to access it. - * The other is that access to BBP and RF registers - * require multiple BUS transactions and if another thread - * attempted to access one of those registers at the same - * time one of the writes could silently fail. - */ - struct mutex usb_cache_mutex; + * Mutex to protect register accesses. + * For PCI and USB devices it protects against concurrent indirect + * register access (BBP, RF, MCU) since accessing those + * registers require multiple calls to the CSR registers. + * For USB devices it also protects the csr_cache since that + * field is used for normal CSR access and it cannot support + * multiple callers simultaneously. + */ + struct mutex csr_mutex; /* * Current packet filter configuration for the device. |