From 798b7adb4ed3533ab1282f51d16892034cfd8aae Mon Sep 17 00:00:00 2001 From: Ivo van Doorn Date: Sat, 8 Nov 2008 15:25:33 +0100 Subject: rt2x00: Cleanup TX/RX entry handling Merge the callback functions init_txentry() and init_rxentry(). This makes life in rt2x00lib a lot simpler and we can cleanup several functions. rt2x00pci contained "fake" FIELD definitions for descriptor words. This is not flexible since it assumes the driver will always have the same field to indicate if a driver is available or not. This should be dependent on the driver, and we should add a callback function for this. Signed-off-by: Ivo van Doorn Signed-off-by: John W. Linville --- drivers/net/wireless/rt2x00/rt2500pci.c | 45 ++++++++++++++++++++------------- 1 file changed, 28 insertions(+), 17 deletions(-) (limited to 'drivers/net/wireless/rt2x00/rt2500pci.c') diff --git a/drivers/net/wireless/rt2x00/rt2500pci.c b/drivers/net/wireless/rt2x00/rt2500pci.c index 928452f30c2..e43ff9c7906 100644 --- a/drivers/net/wireless/rt2x00/rt2500pci.c +++ b/drivers/net/wireless/rt2x00/rt2500pci.c @@ -722,32 +722,43 @@ dynamic_cca_tune: /* * Initialization functions. */ -static void rt2500pci_init_rxentry(struct rt2x00_dev *rt2x00dev, - struct queue_entry *entry) +static bool rt2500pci_get_entry_state(struct queue_entry *entry) { struct queue_entry_priv_pci *entry_priv = entry->priv_data; - struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb); u32 word; - rt2x00_desc_read(entry_priv->desc, 1, &word); - rt2x00_set_field32(&word, RXD_W1_BUFFER_ADDRESS, skbdesc->skb_dma); - rt2x00_desc_write(entry_priv->desc, 1, word); + if (entry->queue->qid == QID_RX) { + rt2x00_desc_read(entry_priv->desc, 0, &word); + + return rt2x00_get_field32(word, RXD_W0_OWNER_NIC); + } else { + rt2x00_desc_read(entry_priv->desc, 0, &word); - rt2x00_desc_read(entry_priv->desc, 0, &word); - rt2x00_set_field32(&word, RXD_W0_OWNER_NIC, 1); - rt2x00_desc_write(entry_priv->desc, 0, word); + return (rt2x00_get_field32(word, TXD_W0_OWNER_NIC) || + rt2x00_get_field32(word, TXD_W0_VALID)); + } } -static void rt2500pci_init_txentry(struct rt2x00_dev *rt2x00dev, - struct queue_entry *entry) +static void rt2500pci_clear_entry(struct queue_entry *entry) { struct queue_entry_priv_pci *entry_priv = entry->priv_data; + struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb); u32 word; - rt2x00_desc_read(entry_priv->desc, 0, &word); - rt2x00_set_field32(&word, TXD_W0_VALID, 0); - rt2x00_set_field32(&word, TXD_W0_OWNER_NIC, 0); - rt2x00_desc_write(entry_priv->desc, 0, word); + if (entry->queue->qid == QID_RX) { + rt2x00_desc_read(entry_priv->desc, 1, &word); + rt2x00_set_field32(&word, RXD_W1_BUFFER_ADDRESS, skbdesc->skb_dma); + rt2x00_desc_write(entry_priv->desc, 1, word); + + rt2x00_desc_read(entry_priv->desc, 0, &word); + rt2x00_set_field32(&word, RXD_W0_OWNER_NIC, 1); + rt2x00_desc_write(entry_priv->desc, 0, word); + } else { + rt2x00_desc_read(entry_priv->desc, 0, &word); + rt2x00_set_field32(&word, TXD_W0_VALID, 0); + rt2x00_set_field32(&word, TXD_W0_OWNER_NIC, 0); + rt2x00_desc_write(entry_priv->desc, 0, word); + } } static int rt2500pci_init_queues(struct rt2x00_dev *rt2x00dev) @@ -1871,8 +1882,8 @@ static const struct rt2x00lib_ops rt2500pci_rt2x00_ops = { .probe_hw = rt2500pci_probe_hw, .initialize = rt2x00pci_initialize, .uninitialize = rt2x00pci_uninitialize, - .init_rxentry = rt2500pci_init_rxentry, - .init_txentry = rt2500pci_init_txentry, + .get_entry_state = rt2500pci_get_entry_state, + .clear_entry = rt2500pci_clear_entry, .set_device_state = rt2500pci_set_device_state, .rfkill_poll = rt2500pci_rfkill_poll, .link_stats = rt2500pci_link_stats, -- cgit v1.2.3 From bad13639a30e1557fbe9d440adc1906673c9de4e Mon Sep 17 00:00:00 2001 From: Ivo van Doorn Date: Sun, 9 Nov 2008 20:47:00 +0100 Subject: rt2x00: Optimize get_duration / get_duration_res We can optimize get_duration and get_duration_res by making them a macro. They are really simple calculation handlers so this doesn't matter much. Often (especially in rt2400pci and rt2500pci, the arguments are hardcoded, and the result value is passed into other hardcoded values. By making the functions a macro GCC can optimize the entire thing much better. Signed-off-by: Ivo van Doorn Signed-off-by: John W. Linville --- drivers/net/wireless/rt2x00/rt2500pci.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) (limited to 'drivers/net/wireless/rt2x00/rt2500pci.c') diff --git a/drivers/net/wireless/rt2x00/rt2500pci.c b/drivers/net/wireless/rt2x00/rt2500pci.c index e43ff9c7906..885844c1a3c 100644 --- a/drivers/net/wireless/rt2x00/rt2500pci.c +++ b/drivers/net/wireless/rt2x00/rt2500pci.c @@ -327,7 +327,7 @@ static void rt2500pci_config_intf(struct rt2x00_dev *rt2x00dev, /* * Enable beacon config */ - bcn_preload = PREAMBLE + get_duration(IEEE80211_HEADER, 20); + bcn_preload = PREAMBLE + GET_DURATION(IEEE80211_HEADER, 20); rt2x00pci_register_read(rt2x00dev, BCNCSR1, ®); rt2x00_set_field32(®, BCNCSR1_PRELOAD, bcn_preload); rt2x00_set_field32(®, BCNCSR1_BEACON_CWMIN, queue->cw_min); @@ -373,25 +373,25 @@ static void rt2500pci_config_erp(struct rt2x00_dev *rt2x00dev, rt2x00pci_register_read(rt2x00dev, ARCSR2, ®); rt2x00_set_field32(®, ARCSR2_SIGNAL, 0x00); rt2x00_set_field32(®, ARCSR2_SERVICE, 0x04); - rt2x00_set_field32(®, ARCSR2_LENGTH, get_duration(ACK_SIZE, 10)); + rt2x00_set_field32(®, ARCSR2_LENGTH, GET_DURATION(ACK_SIZE, 10)); rt2x00pci_register_write(rt2x00dev, ARCSR2, reg); rt2x00pci_register_read(rt2x00dev, ARCSR3, ®); rt2x00_set_field32(®, ARCSR3_SIGNAL, 0x01 | preamble_mask); rt2x00_set_field32(®, ARCSR3_SERVICE, 0x04); - rt2x00_set_field32(®, ARCSR2_LENGTH, get_duration(ACK_SIZE, 20)); + rt2x00_set_field32(®, ARCSR2_LENGTH, GET_DURATION(ACK_SIZE, 20)); rt2x00pci_register_write(rt2x00dev, ARCSR3, reg); rt2x00pci_register_read(rt2x00dev, ARCSR4, ®); rt2x00_set_field32(®, ARCSR4_SIGNAL, 0x02 | preamble_mask); rt2x00_set_field32(®, ARCSR4_SERVICE, 0x04); - rt2x00_set_field32(®, ARCSR2_LENGTH, get_duration(ACK_SIZE, 55)); + rt2x00_set_field32(®, ARCSR2_LENGTH, GET_DURATION(ACK_SIZE, 55)); rt2x00pci_register_write(rt2x00dev, ARCSR4, reg); rt2x00pci_register_read(rt2x00dev, ARCSR5, ®); rt2x00_set_field32(®, ARCSR5_SIGNAL, 0x03 | preamble_mask); rt2x00_set_field32(®, ARCSR5_SERVICE, 0x84); - rt2x00_set_field32(®, ARCSR2_LENGTH, get_duration(ACK_SIZE, 110)); + rt2x00_set_field32(®, ARCSR2_LENGTH, GET_DURATION(ACK_SIZE, 110)); rt2x00pci_register_write(rt2x00dev, ARCSR5, reg); rt2x00pci_register_write(rt2x00dev, ARCSR1, erp->basic_rates); -- cgit v1.2.3 From 8ff48a8bbe4a1ba29dea2836dfce74660f97c1be Mon Sep 17 00:00:00 2001 From: Ivo van Doorn Date: Sun, 9 Nov 2008 23:40:46 +0100 Subject: rt2x00: Fix race condition when using inderect registers Indirect registers require multiple calls to the CSR register in order to access the indirect registers. This must be protected under a lock to prevent race conditions which could cause invalid data to be returned when reading from the indirect register or silent failures when writing data to the indirect register. USB drivers where already protected under a mutex, so rename the mutex and make PCI drivers use the mutex as well. This now means that BBP and RF registers are no longer accessible in interrupt context. That is not a bad situation since the slow behavior of accessing those registers means we don't _want_ to access them in interrupt context either. Signed-off-by: Ivo van Doorn Signed-off-by: John W. Linville --- drivers/net/wireless/rt2x00/rt2500pci.c | 47 ++++++++++++++++++++++++--------- 1 file changed, 34 insertions(+), 13 deletions(-) (limited to 'drivers/net/wireless/rt2x00/rt2500pci.c') diff --git a/drivers/net/wireless/rt2x00/rt2500pci.c b/drivers/net/wireless/rt2x00/rt2500pci.c index 885844c1a3c..972b5a5c386 100644 --- a/drivers/net/wireless/rt2x00/rt2500pci.c +++ b/drivers/net/wireless/rt2x00/rt2500pci.c @@ -69,14 +69,14 @@ static void rt2500pci_bbp_write(struct rt2x00_dev *rt2x00dev, { u32 reg; + mutex_lock(&rt2x00dev->csr_mutex); + /* * Wait until the BBP becomes ready. */ reg = rt2500pci_bbp_check(rt2x00dev); - if (rt2x00_get_field32(reg, BBPCSR_BUSY)) { - ERROR(rt2x00dev, "BBPCSR register busy. Write failed.\n"); - return; - } + if (rt2x00_get_field32(reg, BBPCSR_BUSY)) + goto exit_fail; /* * Write the data into the BBP. @@ -88,6 +88,15 @@ static void rt2500pci_bbp_write(struct rt2x00_dev *rt2x00dev, rt2x00_set_field32(®, BBPCSR_WRITE_CONTROL, 1); rt2x00pci_register_write(rt2x00dev, BBPCSR, reg); + + mutex_unlock(&rt2x00dev->csr_mutex); + + return; + +exit_fail: + mutex_unlock(&rt2x00dev->csr_mutex); + + ERROR(rt2x00dev, "BBPCSR register busy. Write failed.\n"); } static void rt2500pci_bbp_read(struct rt2x00_dev *rt2x00dev, @@ -95,14 +104,14 @@ static void rt2500pci_bbp_read(struct rt2x00_dev *rt2x00dev, { u32 reg; + mutex_lock(&rt2x00dev->csr_mutex); + /* * Wait until the BBP becomes ready. */ reg = rt2500pci_bbp_check(rt2x00dev); - if (rt2x00_get_field32(reg, BBPCSR_BUSY)) { - ERROR(rt2x00dev, "BBPCSR register busy. Read failed.\n"); - return; - } + if (rt2x00_get_field32(reg, BBPCSR_BUSY)) + goto exit_fail; /* * Write the request into the BBP. @@ -118,13 +127,20 @@ static void rt2500pci_bbp_read(struct rt2x00_dev *rt2x00dev, * Wait until the BBP becomes ready. */ reg = rt2500pci_bbp_check(rt2x00dev); - if (rt2x00_get_field32(reg, BBPCSR_BUSY)) { - ERROR(rt2x00dev, "BBPCSR register busy. Read failed.\n"); - *value = 0xff; - return; - } + if (rt2x00_get_field32(reg, BBPCSR_BUSY)) + goto exit_fail; *value = rt2x00_get_field32(reg, BBPCSR_VALUE); + + mutex_unlock(&rt2x00dev->csr_mutex); + + return; + +exit_fail: + mutex_unlock(&rt2x00dev->csr_mutex); + + ERROR(rt2x00dev, "BBPCSR register busy. Read failed.\n"); + *value = 0xff; } static void rt2500pci_rf_write(struct rt2x00_dev *rt2x00dev, @@ -136,6 +152,8 @@ static void rt2500pci_rf_write(struct rt2x00_dev *rt2x00dev, if (!word) return; + mutex_lock(&rt2x00dev->csr_mutex); + for (i = 0; i < REGISTER_BUSY_COUNT; i++) { rt2x00pci_register_read(rt2x00dev, RFCSR, ®); if (!rt2x00_get_field32(reg, RFCSR_BUSY)) @@ -143,6 +161,7 @@ static void rt2500pci_rf_write(struct rt2x00_dev *rt2x00dev, udelay(REGISTER_BUSY_DELAY); } + mutex_unlock(&rt2x00dev->csr_mutex); ERROR(rt2x00dev, "RFCSR register busy. Write failed.\n"); return; @@ -155,6 +174,8 @@ rf_write: rt2x00pci_register_write(rt2x00dev, RFCSR, reg); rt2x00_rf_write(rt2x00dev, word, value); + + mutex_unlock(&rt2x00dev->csr_mutex); } static void rt2500pci_eepromregister_read(struct eeprom_93cx6 *eeprom) -- cgit v1.2.3