[PATCH] zd1211rw: cleanups

Bit-field constants in zd_chip.h are now defined using a shift expression.
The value 0x08 is now (1 << 3). The fix is intended to improve readability.

Remove misleading comment in zd_mac.c: The function already returns -EPERM
in managed mode (IW_MODE_INFRA).

Remove unused code in zd_mac.c: The unused code intended for debugging
rx_status values is no longer useful.

Added dump_stack() to ZD_ASSERT macro: Output of the stack helps to debug
assertions. Keep in mind that the ZD_ASSERT() macro only results in code,
if DEBUG is defined.

Improved comments for filter_rx()

zd_usb.c: Added driver name to module init and exit functions

Signed-off-by: Ulrich Kunitz <kune@deine-taler.de>
Signed-off-by: Daniel Drake <dsd@gentoo.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

4 files changed, 53 insertions, 110 deletions

diff --git a/drivers/net/wireless/zd1211rw/zd_chip.h b/drivers/net/wireless/zd1211rw/zd_chip.h
index ae59597ce4..f441cf40f7 100644
--- a/drivers/net/wireless/zd1211rw/zd_chip.h
+++ b/drivers/net/wireless/zd1211rw/zd_chip.h
@@ -337,24 +337,24 @@
 #define CR_MAC_PS_STATE                 CTL_REG(0x050C)
 
 #define CR_INTERRUPT                    CTL_REG(0x0510)
-#define INT_TX_COMPLETE                 0x00000001
-#define INT_RX_COMPLETE                 0x00000002
-#define INT_RETRY_FAIL                  0x00000004
-#define INT_WAKEUP                      0x00000008
-#define INT_DTIM_NOTIFY                 0x00000020
-#define INT_CFG_NEXT_BCN                0x00000040
-#define INT_BUS_ABORT                   0x00000080
-#define INT_TX_FIFO_READY               0x00000100
-#define INT_UART                        0x00000200
-#define INT_TX_COMPLETE_EN              0x00010000
-#define INT_RX_COMPLETE_EN              0x00020000
-#define INT_RETRY_FAIL_EN               0x00040000
-#define INT_WAKEUP_EN                   0x00080000
-#define INT_DTIM_NOTIFY_EN              0x00200000
-#define INT_CFG_NEXT_BCN_EN             0x00400000
-#define INT_BUS_ABORT_EN                0x00800000
-#define INT_TX_FIFO_READY_EN            0x01000000
-#define INT_UART_EN                     0x02000000
+#define INT_TX_COMPLETE                 (1 <<  0)
+#define INT_RX_COMPLETE                 (1 <<  1)
+#define INT_RETRY_FAIL                  (1 <<  2)
+#define INT_WAKEUP                      (1 <<  3)
+#define INT_DTIM_NOTIFY                 (1 <<  5)
+#define INT_CFG_NEXT_BCN                (1 <<  6)
+#define INT_BUS_ABORT                   (1 <<  7)
+#define INT_TX_FIFO_READY               (1 <<  8)
+#define INT_UART                        (1 <<  9)
+#define INT_TX_COMPLETE_EN              (1 << 16)
+#define INT_RX_COMPLETE_EN              (1 << 17)
+#define INT_RETRY_FAIL_EN               (1 << 18)
+#define INT_WAKEUP_EN                   (1 << 19)
+#define INT_DTIM_NOTIFY_EN              (1 << 21)
+#define INT_CFG_NEXT_BCN_EN             (1 << 22)
+#define INT_BUS_ABORT_EN                (1 << 23)
+#define INT_TX_FIFO_READY_EN            (1 << 24)
+#define INT_UART_EN                     (1 << 25)
 
 #define CR_TSF_LOW_PART                 CTL_REG(0x0514)
 #define CR_TSF_HIGH_PART                CTL_REG(0x0518)
@@ -398,18 +398,18 @@
  * device will use a rate in this table that is less than or equal to the rate
  * of the incoming frame which prompted the response */
 #define CR_BASIC_RATE_TBL               CTL_REG(0x0630)
-#define CR_RATE_1M      0x0001  /* 802.11b */
-#define CR_RATE_2M      0x0002  /* 802.11b */
-#define CR_RATE_5_5M    0x0004  /* 802.11b */
-#define CR_RATE_11M     0x0008  /* 802.11b */
-#define CR_RATE_6M      0x0100  /* 802.11g */
-#define CR_RATE_9M      0x0200  /* 802.11g */
-#define CR_RATE_12M     0x0400  /* 802.11g */
-#define CR_RATE_18M     0x0800  /* 802.11g */
-#define CR_RATE_24M     0x1000  /* 802.11g */
-#define CR_RATE_36M     0x2000  /* 802.11g */
-#define CR_RATE_48M     0x4000  /* 802.11g */
-#define CR_RATE_54M     0x8000  /* 802.11g */
+#define CR_RATE_1M      (1 <<  0)       /* 802.11b */
+#define CR_RATE_2M      (1 <<  1)       /* 802.11b */
+#define CR_RATE_5_5M    (1 <<  2)       /* 802.11b */
+#define CR_RATE_11M     (1 <<  3)       /* 802.11b */
+#define CR_RATE_6M      (1 <<  8)       /* 802.11g */
+#define CR_RATE_9M      (1 <<  9)       /* 802.11g */
+#define CR_RATE_12M     (1 << 10)       /* 802.11g */
+#define CR_RATE_18M     (1 << 11)       /* 802.11g */
+#define CR_RATE_24M     (1 << 12)       /* 802.11g */
+#define CR_RATE_36M     (1 << 13)       /* 802.11g */
+#define CR_RATE_48M     (1 << 14)       /* 802.11g */
+#define CR_RATE_54M     (1 << 15)       /* 802.11g */
 #define CR_RATES_80211G 0xff00
 #define CR_RATES_80211B 0x000f
 
@@ -426,9 +426,9 @@
 /* register for controlling the LEDS */
 #define CR_LED                          CTL_REG(0x0644)
 /* masks for controlling LEDs */
-#define LED1                            0x0100
-#define LED2                            0x0200
-#define LED_SW                          0x0400
+#define LED1                            (1 <<  8)
+#define LED2                            (1 <<  9)
+#define LED_SW                          (1 << 10)
 
 /* Seems to indicate that the configuration is over.
  */
@@ -455,18 +455,18 @@
  * registers, so one could argue it is a LOCK bit. But calling it
  * LOCK_PHY_REGS makes it confusing.
  */
-#define UNLOCK_PHY_REGS                 0x0080
+#define UNLOCK_PHY_REGS                 (1 << 7)
 
 #define CR_DEVICE_STATE                 CTL_REG(0x0684)
 #define CR_UNDERRUN_CNT                 CTL_REG(0x0688)
 
 #define CR_RX_FILTER                    CTL_REG(0x068c)
-#define RX_FILTER_ASSOC_RESPONSE        0x0002
-#define RX_FILTER_REASSOC_RESPONSE      0x0008
-#define RX_FILTER_PROBE_RESPONSE        0x0020
-#define RX_FILTER_BEACON                0x0100
-#define RX_FILTER_DISASSOC              0x0400
-#define RX_FILTER_AUTH                  0x0800
+#define RX_FILTER_ASSOC_RESPONSE        (1 <<  1)
+#define RX_FILTER_REASSOC_RESPONSE      (1 <<  3)
+#define RX_FILTER_PROBE_RESPONSE        (1 <<  5)
+#define RX_FILTER_BEACON                (1 <<  8)
+#define RX_FILTER_DISASSOC              (1 << 10)
+#define RX_FILTER_AUTH                  (1 << 11)
 #define AP_RX_FILTER                    0x0400feff
 #define STA_RX_FILTER                   0x0000ffff
 
diff --git a/drivers/net/wireless/zd1211rw/zd_def.h b/drivers/net/wireless/zd1211rw/zd_def.h
index a13ec72eb3..fb22f62cf1 100644
--- a/drivers/net/wireless/zd1211rw/zd_def.h
+++ b/drivers/net/wireless/zd1211rw/zd_def.h
@@ -39,6 +39,7 @@ do { \
         if (!(x)) { \
                 pr_debug("%s:%d ASSERT %s VIOLATED!\n", \
                         __FILE__, __LINE__, __stringify(x)); \
+                dump_stack(); \
         } \
 } while (0)
 #else
diff --git a/drivers/net/wireless/zd1211rw/zd_mac.c b/drivers/net/wireless/zd1211rw/zd_mac.c
index 7845b6dac8..0bb53f0b8b 100644
--- a/drivers/net/wireless/zd1211rw/zd_mac.c
+++ b/drivers/net/wireless/zd1211rw/zd_mac.c
@@ -295,7 +295,6 @@ static void set_channel(struct net_device *netdev, u8 channel)
         zd_chip_set_channel(&mac->chip, channel);
 }
 
-/* TODO: Should not work in Managed mode. */
 int zd_mac_request_channel(struct zd_mac *mac, u8 channel)
 {
         unsigned long lock_flags;
@@ -773,9 +772,11 @@ static int is_data_packet_for_us(struct ieee80211_device *ieee,
                (netdev->flags & IFF_PROMISC);
 }
 
-/* Filters receiving packets. If it returns 1 send it to ieee80211_rx, if 0
- * return. If an error is detected -EINVAL is returned. ieee80211_rx_mgt() is
- * called here.
+/* Filters received packets. The function returns 1 if the packet should be
+ * forwarded to ieee80211_rx(). If the packet should be ignored the function
+ * returns 0. If an invalid packet is found the function returns -EINVAL.
+ *
+ * The function calls ieee80211_rx_mgt() directly.
  *
  * It has been based on ieee80211_rx_any.
  */
@@ -801,9 +802,9 @@ static int filter_rx(struct ieee80211_device *ieee,
                 ieee80211_rx_mgt(ieee, hdr, stats);
                 return 0;
         case IEEE80211_FTYPE_CTL:
-                /* Ignore invalid short buffers */
                 return 0;
         case IEEE80211_FTYPE_DATA:
+                /* Ignore invalid short buffers */
                 if (length < sizeof(struct ieee80211_hdr_3addr))
                         return -EINVAL;
                 return is_data_packet_for_us(ieee, hdr);
@@ -1019,66 +1020,6 @@ struct iw_statistics *zd_mac_get_wireless_stats(struct net_device *ndev)
         return iw_stats;
 }
 
-#ifdef DEBUG
-static const char* decryption_types[] = {
-        [ZD_RX_NO_WEP] = "none",
-        [ZD_RX_WEP64] = "WEP64",
-        [ZD_RX_TKIP] = "TKIP",
-        [ZD_RX_AES] = "AES",
-        [ZD_RX_WEP128] = "WEP128",
-        [ZD_RX_WEP256] = "WEP256",
-};
-
-static const char *decryption_type_string(u8 type)
-{
-        const char *s;
-
-        if (type < ARRAY_SIZE(decryption_types)) {
-                s = decryption_types[type];
-        } else {
-                s = NULL;
-        }
-        return s ? s : "unknown";
-}
-
-static int is_ofdm(u8 frame_status)
-{
-        return (frame_status & ZD_RX_OFDM);
-}
-
-void zd_dump_rx_status(const struct rx_status *status)
-{
-        const char* modulation;
-        u8 quality;
-
-        if (is_ofdm(status->frame_status)) {
-                modulation = "ofdm";
-                quality = status->signal_quality_ofdm;
-        } else {
-                modulation = "cck";
-                quality = status->signal_quality_cck;
-        }
-        pr_debug("rx status %s strength %#04x qual %#04x decryption %s\n",
-                modulation, status->signal_strength, quality,
-                decryption_type_string(status->decryption_type));
-        if (status->frame_status & ZD_RX_ERROR) {
-                pr_debug("rx error %s%s%s%s%s%s\n",
-                        (status->frame_status & ZD_RX_TIMEOUT_ERROR) ?
-                                "timeout " : "",
-                        (status->frame_status & ZD_RX_FIFO_OVERRUN_ERROR) ?
-                                "fifo " : "",
-                        (status->frame_status & ZD_RX_DECRYPTION_ERROR) ?
-                                "decryption " : "",
-                        (status->frame_status & ZD_RX_CRC32_ERROR) ?
-                                "crc32 " : "",
-                        (status->frame_status & ZD_RX_NO_ADDR1_MATCH_ERROR) ?
-                                "addr1 " : "",
-                        (status->frame_status & ZD_RX_CRC16_ERROR) ?
-                                "crc16" : "");
-        }
-}
-#endif /* DEBUG */
-
 #define LINK_LED_WORK_DELAY HZ
 
 static void link_led_handler(void *p)
diff --git a/drivers/net/wireless/zd1211rw/zd_usb.c b/drivers/net/wireless/zd1211rw/zd_usb.c
index 34524b7332..c3449cfae7 100644
--- a/drivers/net/wireless/zd1211rw/zd_usb.c
+++ b/drivers/net/wireless/zd1211rw/zd_usb.c
@@ -1116,27 +1116,28 @@ static int __init usb_init(void)
 {
         int r;
 
-        pr_debug("usb_init()\n");
+        pr_debug("%s usb_init()\n", driver.name);
 
         zd_workqueue = create_singlethread_workqueue(driver.name);
         if (zd_workqueue == NULL) {
-                printk(KERN_ERR "%s: couldn't create workqueue\n", driver.name);
+                printk(KERN_ERR "%s couldn't create workqueue\n", driver.name);
                 return -ENOMEM;
         }
 
         r = usb_register(&driver);
         if (r) {
-                printk(KERN_ERR "usb_register() failed. Error number %d\n", r);
+                printk(KERN_ERR "%s usb_register() failed. Error number %d\n",
+                       driver.name, r);
                 return r;
         }
 
-        pr_debug("zd1211rw initialized\n");
+        pr_debug("%s initialized\n", driver.name);
         return 0;
 }
 
 static void __exit usb_exit(void)
 {
-        pr_debug("usb_exit()\n");
+        pr_debug("%s usb_exit()\n", driver.name);
         usb_deregister(&driver);
         destroy_workqueue(zd_workqueue);
 }