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| author | Xiaotian Feng <Xiaotian.Feng@windriver.com> | 2009-03-06 11:01:23 +0800 |
|---|---|---|
| committer | Kumar Gala <galak@kernel.crashing.org> | 2009-03-09 11:45:51 -0500 |
| commit | 9ab921201444e4dcfd0c14ac4cc6758e32059dae (patch) | |
| tree | 3985460c385c8378b3c9b9c26b2c72d612878e63 /drivers/serial/cpm_uart | |
| parent | 0bcd783c1f0396b68410fdb41fbe196fbc1947af (diff) | |
| download | linux-9ab921201444e4dcfd0c14ac4cc6758e32059dae.tar.gz linux-9ab921201444e4dcfd0c14ac4cc6758e32059dae.tar.bz2 linux-9ab921201444e4dcfd0c14ac4cc6758e32059dae.zip | |
cpm_uart: fix non-console port startup bug
After UART interrupt handler is installed and rx is enabled, if an rx
interrupt comes before hardware init, rx->cur will be updated. Then the
hardware init will reset BD and make rx->cur out of sync, move the hardware
init code before request_irq.
Signed-off-by: Xiaotian Feng <xiaotian.feng@windriver.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'drivers/serial/cpm_uart')
| -rw-r--r-- | drivers/serial/cpm_uart/cpm_uart_core.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/drivers/serial/cpm_uart/cpm_uart_core.c b/drivers/serial/cpm_uart/cpm_uart_core.c index bde4b4b0b80f..5c6ef51da274 100644 --- a/drivers/serial/cpm_uart/cpm_uart_core.c +++ b/drivers/serial/cpm_uart/cpm_uart_core.c @@ -406,6 +406,18 @@ static int cpm_uart_startup(struct uart_port *port) pr_debug("CPM uart[%d]:startup\n", port->line); + /* If the port is not the console, make sure rx is disabled. */ + if (!(pinfo->flags & FLAG_CONSOLE)) { + /* Disable UART rx */ + if (IS_SMC(pinfo)) { + clrbits16(&pinfo->smcp->smc_smcmr, SMCMR_REN); + clrbits8(&pinfo->smcp->smc_smcm, SMCM_RX); + } else { + clrbits32(&pinfo->sccp->scc_gsmrl, SCC_GSMRL_ENR); + clrbits16(&pinfo->sccp->scc_sccm, UART_SCCM_RX); + } + cpm_line_cr_cmd(pinfo, CPM_CR_INIT_TRX); + } /* Install interrupt handler. */ retval = request_irq(port->irq, cpm_uart_int, 0, "cpm_uart", port); if (retval) @@ -420,8 +432,6 @@ static int cpm_uart_startup(struct uart_port *port) setbits32(&pinfo->sccp->scc_gsmrl, (SCC_GSMRL_ENR | SCC_GSMRL_ENT)); } - if (!(pinfo->flags & FLAG_CONSOLE)) - cpm_line_cr_cmd(pinfo, CPM_CR_INIT_TRX); return 0; } |