AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2024-11-26 05:30:53 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity

ARM: PL011: Ensure IRQs are disabled in UART interrupt handler

Browse Source 
As the DMA support introduces a separate interrupt-time callback, our
interrupt handler will not be the only handler which takes the port
lock, so we need to ensure that IRQs are disabled.  We must use the
_irqsave variant so we don't inadvertently enable interrupts.

Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2010-12-22 17:16:09 +00:00
parent ffca2b114c
commit 963cc981af
1 changed files with 3 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/serial/amba-pl011.c
View File

@ -247,10 +247,11 @@ static void pl011_modem_status(struct uart_amba_port *uap)
static irqreturn_t pl011_int(int irq, void *dev_id)
{
struct uart_amba_port *uap = dev_id;
unsigned long flags;
unsigned int status, pass_counter = AMBA_ISR_PASS_LIMIT;
int handled = 0;
spin_lock(&uap->port.lock);
spin_lock_irqsave(&uap->port.lock, flags);
status = readw(uap->port.membase + UART011_MIS);
if (status) {
@ -275,7 +276,7 @@ static irqreturn_t pl011_int(int irq, void *dev_id)
handled = 1;
}
spin_unlock(&uap->port.lock);
spin_unlock_irqrestore(&uap->port.lock, flags);
return IRQ_RETVAL(handled);
}