OpenE2K
/
linux
6
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

cpm_uart: Fix cpm uart corruption with PREEMPT_RT 

Fix CPM serial port corruption when running with CONFIG_PREEMPT_RT.
Userland usage of console, and kernel printf's were stepping on each others toes.
Also only take lock if not in an oops.

Signed-off-by: Rune Torgersen <runet@innovsys.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
Rune Torgersen 2008-05-20 14:39:17 -05:00 committed by Kumar Gala
parent 0fe9b1ea60
commit 491a7a436c
1 changed files with 14 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
drivers/serial/cpm_uart/cpm_uart_core.c Normal file → Executable file
View File

@ -969,6 +969,14 @@ static void cpm_uart_console_write(struct console *co, const char *s,
unsigned int i;
cbd_t __iomem *bdp, *bdbase;
unsigned char *cp;
unsigned long flags;
int nolock = oops_in_progress;
if (unlikely(nolock)) {
local_irq_save(flags);
} else {
spin_lock_irqsave(&pinfo->port.lock, flags);
}
/* Get the address of the host memory buffer.
*/
@ -1030,6 +1038,12 @@ static void cpm_uart_console_write(struct console *co, const char *s,
;
pinfo->tx_cur = bdp;
if (unlikely(nolock)) {
local_irq_restore(flags);
} else {
spin_unlock_irqrestore(&pinfo->port.lock, flags);
}
}