From 718e94907d79e74bbc7cfdb3cda2266079c5e993 Mon Sep 17 00:00:00 2001 From: "Prasanna S. Panchamukhi" Date: Thu, 8 Apr 2010 16:24:29 -0700 Subject: [PATCH] wimax/i2400m: fix BUILD_BUG_ON() to use the maximum message size constant [v1] The older method of computing the maximum PDU size relied on a method that doesn't work when we prop the maximum number of payloads up to the physical limit, and thus we kill the whole computation and just verify that the constants are congruent. Signed-off-by: Prasanna S. Panchamukhi --- drivers/net/wimax/i2400m/tx.c | 20 +++++--------------- 1 file changed, 5 insertions(+), 15 deletions(-) diff --git a/drivers/net/wimax/i2400m/tx.c b/drivers/net/wimax/i2400m/tx.c index a5002c8..1725f2b 100644 --- a/drivers/net/wimax/i2400m/tx.c +++ b/drivers/net/wimax/i2400m/tx.c @@ -287,19 +287,6 @@ enum { * documents, the maximum size of each message can be up to 16KiB. */ I2400M_TX_MSG_SIZE = 16384, - /* - * 16 byte aligned MAX_MTU + 4 byte payload prefix. - */ - I2400M_MAX_MTU_ALIGN = 16, - I2400M_TX_PDU_SIZE = I2400M_MAX_MTU % I2400M_MAX_MTU_ALIGN - + I2400M_MAX_MTU + sizeof(struct i2400m_pl_data_hdr), - /* - * 256 byte aligned toal size of 12 PDUs including msg header, - */ - I2400M_TX_PDU_ALIGN = 256, - I2400M_TX_PDU_TOTAL_SIZE = ((I2400M_TX_PDU_SIZE * I2400M_TX_PLD_MAX - + sizeof(struct i2400m_msg_hdr))/I2400M_TX_PDU_ALIGN + 1) - * I2400M_TX_PDU_ALIGN * 2, }; #define TAIL_FULL ((void *)~(unsigned long)NULL) @@ -915,8 +902,11 @@ int i2400m_tx_setup(struct i2400m *i2400m) goto error_kmalloc; } - /* Warn if the calculated buffer size exceeds I2400M_TX_BUF_SIZE. */ - BUILD_BUG_ON(I2400M_TX_PDU_TOTAL_SIZE > I2400M_TX_BUF_SIZE); + /* + * Fail the build if we can't fit at least two maximum size messages + * on the TX FIFO [one being delivered while one is constructed]. + */ + BUILD_BUG_ON(2 * I2400M_TX_MSG_SIZE > I2400M_TX_BUF_SIZE); spin_lock_irqsave(&i2400m->tx_lock, flags); i2400m->tx_sequence = 0; i2400m->tx_in = 0; -- 2.7.4